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Organization

1.	ORGANIZATION

21Vianet Group, Inc. (the “Company”) was incorporated under the laws of the Cayman Islands on October 16, 2009 and its principal activity is investment holding. The Company is principally engaged in the provision of Hosting and related services and Managed Network Services. .

(a)

As of December 31, 2014, the significant subsidiaries of the Company and consolidated variable interest entities are as follows:


Entity	Date of incorporation/ Acquisition	Place of incorporation	Percentage of direct ownership by the Company			Principal activities
			Direct
Subsidiaries:
21ViaNet Group Limited (“21Vianet HK”)	May 25, 2007	Hong Kong		100	%	Investment holding
21ViaNet Data Center Co., Ltd. (“21Vianet China”) (1)	June 12, 2000	PRC		100	%	Provision of technical and consultation services and rental of long-lived assets
Fastweb International Holdings (“Fastweb Holdings”) (4)	September 9, 2012	Cayman Islands		100	%	Investment holding
Hongkong Fastweb Holdings Co., Limited (“Fastweb HK”) (4)	September 9, 2012	Hong Kong		100	%	Investment holding
Beijing Fastweb Technology Co., Ltd. (“Fastweb Technology”) (1) / (4)	September 9, 2012	PRC		100	%	Dormant company
21Vianet (Foshan) Technology Co., Ltd. (“FS Technology”) (1)	December 20, 2011	PRC		100	%	Trading of network equipment, provision of technical and internet data center services
21Vianet Anhui Suzhou Technology Co., Ltd. (“SZ Technology”) (1)	November 16, 2011	PRC		100	%	Trading of network equipment
21Vianet Hangzhou Information Technology Co., Ltd. (“HZ Technology”) (1)	March 4, 2013	PRC		100	%	Dormant company
21Vianet Mobile Limited (“21V Mobile”) (6)	April 30, 2013	Hong Kong		100	%	Investment holding
Joytone Infotech Co., Ltd. (“SZ Zhuoaiyi”) (1) / (6)	April 30, 2013	PRC		100	%	Provision of technical and consultation services
Abitcool (China) Broadband Inc. (“aBitCool DG”) (1)	June 13, 2014	PRC		100	%	Provision of telecommunication services
WiFire Group Inc. (“WiFire Group”)	March 7, 2014	British Virgin Islands		100	%	Investment holding
Diyixian.com Limited (“DYX”) (9)	August 10, 2014	Hong Kong		100	%	Provision of virtual private network services
Dermot Holding Limited (“Dermot BVI”) (9)	August 10, 2014	British Virgin Islands		100	%	Investment holding

Variable Interest Entities (the “VIEs”):
Beijing Yiyun Network Technology Co., Ltd. (formerly known as Beijing aBitCool Network Technology Co., Ltd.) (“21Vianet Technology”) (1) / (2)	October 22, 2002	PRC		—		Provision of internet data center and managed network services
Beijing iJoy Information Technology Co., Ltd. (“BJ iJoy”) (1) / (2) / (6)	April 30, 2013	PRC		—		Provision of internet data center, content delivery network services
aBitCool Small Micro Network Technology (BJ) Co., Ltd. (“aBitCool BJ) (1) / (2)	April 1, 2014	PRC		—		Provision of telecommunication services

Held directly by BJ iJoy:
Shanghai iJoy Information Technology Co., Ltd. (“SH iJoy”) (1) / (2) / (6)	May 30, 2013	PRC		—		Provision of internet data center, content delivery network services

Held directly by aBitCool BJ:
Shanghai Guotong Network Co., Ltd. (“SH Guotong”) (1) / (2) / (10)	July 31, 2014	PRC		—		Provision of content delivery network services

Held directly by 21Vianet Technology:
Beijing 21Vianet Broad Band Data Center Co., Ltd. (“21Vianet Beijing”) (1) / (2)	March 15, 2006	PRC		—		Provision of internet data center and managed network services
Dongguan Asia Cloud Investment Co., Ltd. (“Asia Cloud Investment”) (1) / (2) / (7)	July 30, 2013	PRC		—		Investment holding

Held directly by Asia Cloud Investment:
Dongguan Asia Cloud Network Technology Co., Ltd. (“Asia Cloud Technology”) (1) / (2) / (7)	August 16, 2013	PRC		—		Dormant company

Held directly by 21Vianet Beijing:
Beijing Chengyishidai Network Technology Co., Ltd. (“CYSD”) (1) / (2) / (3)	September 30, 2010	PRC		—		Provision of managed network services
Zhiboxintong (Beijing) Network Technology Co., Ltd. (“ZBXT”) (1) / (2) / (3)	September 30, 2010	PRC		—		Provision of managed network services
Guangzhou Gehua Network Technology and Development Co., Ltd. (“Gehua”) (1) / (2)	October 8, 2011	PRC		—		Provision of managed network services
Langfang Xunchi Computer Data Processing Co., Ltd. (“LF Xunchi”) (1) / (2)	December 19, 2011	PRC		—		Dormant company
Beijing Fastweb Network Technology Co., Ltd. (“BJ Fastweb”) (1) / (2) / (4)	September 9, 2012	PRC		—		Provision of internet data center and internet content delivery network services
Shanghai Blue Cloud Technology Co., Ltd. (“SH Blue Cloud”) (1) / (2)	March 21, 2013	PRC		—		Provision of Office 365 and Windows Azure platform services
Beijing Tianwang Online Communication Technology Co., Ltd. (“BJ Tianwang”) (1) / (2) / (5)	February 28, 2013	PRC		—		Provision of managed network services and virtual private network services
Beijing Yilong Technology Co., Ltd. (“BJ Yilong”) (1) / (2) / (5)	February 28, 2013	PRC		—		Provision of managed network services and virtual private network services
Beijing Yichengtaihe Investment Co., Ltd. (“BJ Yichengtaihe”) (1) / (2) / (11)	September 30, 2014	PRC		—		Dormant Company

Held directly by LF Xunchi:
Sichuan Aipu Network Co., Ltd. (“SC Aipu”) (1) / (2) / (8)	May 31, 2014	PRC		—		Provision of community network services and business network services

Held directly by DYX:
DYXnet Limited (“DYXnet”) (9)	August 10, 2014	Hong Kong		100	%	Dormant Company

Held by DYX and LF Xunchi:
Shenzhen Diyixian Communication Co., Ltd. (“SZ DYX”) (1) / (9)	August 10, 2014	PRC		50	%	Provision of virtual private network services

(1)

Collectively, the “PRC Subsidiaries”.

(2)

Collectively, the “Consolidated VIEs”.

(3)

On September 30, 2014, the Company through its subsidiary, 21Vianet Beijing acquired CYSD, ZBXT and its subsidiaries (collectively, the “Managed Network Entities”).

(4)

On September 9, 2012, the Company and its subsidiary, 21Vianet Beijing, acquired 100% equity interest in Fastweb Holding and its subsidiaries (collectively referred to as “Fastweb”) (Note 4).

(5)

On February 28, 2013, the Company through its wholly-owned subsidiary, 21Vianet Beijing, acquired 100% equity interests in BJ Tianwang and BJ Yilong. (collectively referred to as “Tianwang and Yilong”) (Note 4).

(6)

On April 30, 2013, the Company acquired 100% equity interest in 21V Mobile and its subsidiaries (collectively referred to as “iJoy”) (Note 4).

(7)

On July 30, 2013, the Company through 21Vianet Technology, and a state-owned entity established these entities for future operations of telecommunication related services (collectively referred to as “Asia Cloud Group”) (Note 1(c)).

(8)

On May 31, 2014, the Company and its subsidiary, Langfang Xunchi Computer Data Processing Co., Ltd. (“LF Xunchi”), acquired 50% equity interest plus one share in SC Aipu and its subsidiaries (collectively referred to as “Aipu Group”) (Note 4).

(9)

On August 10, 2014, the Company and its subsidiary, LF Xunchi, acquired 100% equity interest Dermot BVI and its subsidiaries (collectively referred to as “Dermot Entities”) (Note 4).

(10)

On August 1, 2014, the Company through its subsidiary, aBitCool BJ acquired 100% equity interest in the entity.

(11)

On September 30, 2014, the Company through its subsidiary, 21Vianet Beijing acquired 100% equity interest in the entity, which was accounted for an asset acquisition (Note 4).

(b)

PRC laws and regulations prohibit foreign ownership of internet and telecommunications-related businesses. To comply with these foreign ownership restrictions, the Group conducts its businesses in the PRC through its VIEs using contractual agreements (the “VIE Agreements”). The equity interests of 21Vianet Technology are legally held by certain PRC individuals, including Chen Sheng, the Director and CEO of the Company and Zhang Jun (collectively the “Nominee Shareholders”). The following is a summary of the key terms of the VIE Agreements:

Exclusive option agreement

Pursuant to the exclusive option agreement entered into amongst 21Vianet China and the Nominee Shareholders of 21Vianet Technology, the Nominee Shareholders granted the Company or its designated party, an exclusive irrevocable option to purchase all or part of the equity interests held by the Nominee Shareholders in 21Vianet Technology, when and to the extent permitted under the PRC laws, at an amount equal to RMB1. 21Vianet Technology cannot declare any profit distributions or grant loans in any form without the prior written consent of 21Vianet China. The Nominee Shareholders must remit in full any funds received from 21Vianet Technology to 21Vianet China, in the event any distributions are made by 21Vianet Technology. The term of this agreement is 10 years, expiring on December 18, 2016, which is renewable at the sole discretion of 21Vianet China.

Exclusive technical consulting and service agreement

Pursuant to the exclusive technical consulting and service agreement entered into between 21Vianet China and 21Vianet Technology, 21Vianet China is to provide exclusive management consulting services and internet technical services in return for fees based on of a predetermined hourly rate of RMB1, which is adjustable at the sole discretion of 21Vianet China. The term of this agreement is 10 years, expiring on December 18, 2016, which is renewable at the sole discretion of 21Vianet China.

Loan agreement

In January 2011, 21Vianet China and the Nominee Shareholders entered into a loan agreement. Pursuant to the agreement, 21Vianet China has provided interest-free loan facilities of RMB7,000 and RMB3,000, respectively, to the Nominee Shareholders of 21Vianet Technology for the purpose of providing capital to 21Vianet Technology to develop its data center and telecommunications value-added business and related businesses. There is no fixed term for the loan.

Power of attorney agreement

The Nominee Shareholders entered into the power of attorney agreement whereby they granted an irrevocable proxy of the voting rights underlying their respective equity interests in 21Vianet Technology to 21Vianet China, which includes, but are not limited to, all the shareholders’ rights and voting rights empowered to the Nominee Shareholders by the company law and 21Vianet Technology’s Articles of Association. The power of attorney remains valid and irrevocable from the date of execution, so long as each Nominee Shareholder remains as a shareholder of 21Vianet Technology.

The power of attorney agreement was subsequently reassigned to 21Vianet Group, Inc. in September 2010.

Share pledge agreement

Pursuant to the share pledge agreement entered into amongst 21Vianet China, 21Vianet Technology and the Nominee Shareholders, the Nominee Shareholders have contemporaneously pledged all their equity interests in 21Vianet Technology to guarantee the repayment of the loan under the Loan Agreement between 21Vianet China and the Nominee Shareholders.

If 21Vianet Technology breaches its respective contractual obligations under the Share pledge agreement and the loan agreement, 21Vianet China, as pledgee, will be entitled to certain rights, including the right to sell the pledged equity interests. The Nominee Shareholders agreed not to transfer, sell, pledge, dispose of or otherwise create any new encumbrance on their equity interests in 21Vianet Technology without the prior written consent of 21Vianet China.

Financial support letter

Pursuant to the financial support letter, 21Vianet Group, Inc. agreed to provide unlimited financial support to 21Vianet Technology for its operations and agreed to forego the right to seek repayment in the event 21Vianet Technology is unable to repay such funding.

The Company also controls two other VIEs, namely BJ iJoy and aBitCool BJ through their primary beneficiary, WiFire Group, a wholly owned subsidiary of the Company. The key terms of the VIE Agreements in relation to BJ iJoy and aBitCool BJ are similar to those summarized above.

Despite the lack of technical majority ownership, there exists a parent-subsidiary relationship between the Company and 21Vianet Technology through the irrevocable power of attorney agreement, whereby the Nominee Shareholders effectively assigned all of their voting rights underlying their equity interests in 21Vianet Technology to the Company. In addition, the Company, through 21Vianet China, obtained effective control over 21Vianet Technology through the ability to exercise all the rights of 21Vianet Technology’s shareholders pursuant to the share pledge agreement and exclusive option agreement. The Company demonstrates its ability and intention to continue to exercise the ability to absorb substantially all of the expected losses through the financial support letter. In addition, the Company also demonstrates its ability to receive substantially all of the economic benefits of 21Vianet Technology through 21Vianet China through the consulting and service agreement. Thus, the Company is the primary beneficiary of 21Vianet Technology and consolidates 21Vianet Technology and its subsidiaries under ASC 810-10 Consolidation: Overall. Similar conclusion has been reached with respect to the VIE structures with WiFire Group as the primary beneficiary.

In the opinion of the Company’s management and PRC counsel, (i) the ownership structure of the VIEs is in compliance with existing PRC laws and regulations in any material respect, (ii) each of the VIE Agreements is valid, legally binding and enforceable to each party of such agreements under the existing PRC laws, (iii) the execution, delivery, effectiveness, enforceability and performance of each of the VIE Agreements will not violate any PRC laws or regulations currently in effect, except for such violation that would not have a material adverse effect, and (iv) the Company’s operations are in compliance with existing PRC laws and regulations in all material aspects.

However, there are substantial uncertainties regarding the interpretation and application of current and future PRC laws and regulations. Accordingly, the Company cannot be assured that PRC regulatory authorities will not ultimately take a contrary view to its opinion. If the current ownership structure of the Company and its contractual arrangements with the VIEs are found to be in violation of any existing or future PRC laws and regulations, the Company may be required to restructure its ownership structure and operations in the PRC to comply with the changing and new PRC laws and regulations. To the extent that changes and new PRC laws and regulations prohibit the Company’s VIE arrangements from complying with the principles of consolidation, the Company would have to deconsolidate the financial position and results of operations of its VIEs. In the opinion of management, the likelihood of loss in respect of the Company’s current ownership structure or the contractual arrangements with the VIEs is remote based on current facts and circumstances.

(c)

Establishment of Asia Cloud Group

On July 30, 2013, the Company through 21Vianet Technology, and a state-owned entity (“SOE”) established Asia Cloud Investment in the Guangdong Province of the PRC for the operations of telecommunication related services. The registered capital of Asia Cloud Investment is RMB1,000,000, of which RMB900,000 and RMB100,000 were contributed by 21Vianet Technology and the SOE, respectively, for 90% and 10% equity interests held by 21Vianet Technology and the SOE, respectively. The investment structure is set up as follows:

(i)

21Vianet Technology received two entrusted loans from Bank of Dongguan which were entrusted by the SOE with an aggregate principal amount of RMB900,000, an annual interest rate of 4% and maturity dates of August 28 and September 10, 2015, respectively (Note 14), for the sole purpose of 21Vianet Technology’s capital contribution in Asia Cloud Investment. In return, 21Vianet Technology pledged its right of sale or transfer of the 90% equity interest in Asia Cloud Investment and the underlying dividend rights to the SOE to guarantee the repayment of the loans.

(ii)

Pursuant to a confirmation letter effective since the incorporation of Asia Cloud Investment, 21Vianet Technology agreed to provide unlimited financial support to Asia Cloud Investment for its operations and agreed to forego the right to seek repayment in the event Asia Cloud Investment is unable to repay such funding.

(iii)

The 10% equity interest in Asia Cloud Investment held by the SOE is contractually required to be repurchased by 21Vianet Technology by the end of five years from the establishment of Asia Cloud Investment at a consideration equivalent to the higher of the then fair value and the investment cost of RMB100,000. The SOE is also entitled to a cumulative dividend at 8% per annum for its capital contribution of RMB100,000 in Asia Cloud Investment.

As of December 31, 2014, Asia Cloud Investment and its subsidiary, Asia Cloud Technology, had not commenced any significant operations except for investments in certain held-to-maturity securities with an aggregate amount of RMB900,000 (Note 6).

Asia Cloud Investment is determined as a variable interest entity as 21Vianet Technology’s investment of RMB900,000 was funded by the SOE, which is also a party involved in Asia Cloud Investment. As 21Vianet Technology maintains the power to direct the activities that most significantly affect Asia Cloud Investment’s economic performances through its voting interest underlying the 90% equity interest in accordance with company law and the articles of association of Asia Cloud Investment and absorbs the expected losses of Asia Cloud Investment, 21Vianet Technology is the primary beneficiary of Asia Cloud Investment and consolidates Asia Cloud Investment and its subsidiary under by ASC 810-10 Consolidation: Overall.

21Vianet Technology is contractually obligated to repurchase the 10% noncontrolling interests (“NCI”) in Asia Cloud Group at the end of five years from its establishment. The NCI, together with the embedded repurchase contract, is accounted for as a liability under ASC 480, Distinguish Liabilities from Equity and recorded as “Mandatorily redeemable noncontrolling interests” in the Company’s consolidated balance sheets. The mandatorily redeemable noncontrolling interests was initially measured at fair value, which approximated its issuance value and subsequently measured at the amount of cash that would be paid under the conditions specified in the contract if settlement occurred at the reporting date, which is the higher of the then fair value of the NCI and the initial investment cost of RMB100,000, with the resulting change in that amount from the initial value as an interest expense.

(d)

VIE disclosures

Except for certain property with carrying amounts of RMB14,298 (US$2,304) that were pledged to secure banking borrowings granted to the Company (Note 14), there were no pledges or collateralization of the Consolidated VIEs’ assets. Creditors of the Consolidated VIEs have no recourse to the general credit of the primary beneficiaries of the Consolidated VIEs, and such amounts have been parenthetically presented on the face of the consolidated balance sheets. The Consolidated VIEs operate the data centers and own facilities including data center buildings, leasehold improvements, fiber optic cables, computers and network equipment, which are recognized in the Company’s consolidated financial statements. They also hold certain value-added technology licenses, registered copyrights, trademarks and registered domain names, including the official website, which are also considered as revenue-producing assets. However, none of such assets was recorded on the Company’s consolidated balance sheets as such assets were all acquired or internally developed with insignificant cost and expensed as incurred. In addition, the Company also hires data center operation and marketing workforce for its daily operations and such costs are expensed when incurred. The Company has not provided any financial or other support that it was not previously contractually required to provide to the Consolidated VIEs during the periods presented.

The following tables represent the financial information of the Consolidated VIEs as of December 31, 2013 and 2014 and for the years ended December 31, 2012, 2013 and 2014 before eliminating the intercompany balances and transactions between the Consolidated VIEs and other entities within the Group:


	As of December 31,
	2013		2014
	RMB		RMB		US$
ASSETS
Current assets:
Cash and cash equivalents		259,987		369,597		59,568
Restricted cash		3,020		61,649		9,936
Accounts receivable (net of allowance for doubtful accounts of RMB547 and RMB10,012 (US$1,614) as of December 31, 2013 and 2014, respectively)		605,205		677,375		109,173
Inventories		—		9,673		1,559
Short-term investments		900,000		900,000		145,054
Prepaid expenses and other current assets		110,865		258,474		41,658
Deferred tax assets		19,091		33,717		5,434
Amounts due from a related party		9,800		9,800		1,579

Total current assets		1,907,968		2,320,285		373,961

Non-current assets:
Property and equipment, net		813,939		1,945,176		313,505
Intangible assets, net		230,607		904,921		145,847
Land use right		—		66,175		10,665
Goodwill		410,500		1,146,570		184,794
Deferred tax assets		17,202		40,363		6,505
Amount due from a related party		—		28,500		4,593
Other non-current assets		11,645		65,942		10,628
Long-term investments		98,526		110,626		17,830

Total non-current assets		1,582,419		4,308,273		694,367

Total assets		3,490,387		6,628,558		1,068,328


	As of December 31,
	2013		2014
	RMB		RMB		US$
Current liabilities:
Short-term bank borrowings		173,726		160,181		25,816
Accounts and notes payable		186,381		340,519		54,882
Accrued expenses and other payables		195,816		375,124		60,459
Advance from customers		546		97,679		15,743
Income tax payable		11,427		27,677		4,461
Deferred revenue		32,558		338,655		54,581
Amount due to inter-companies (1)		394,418		491,522		79,219
Amount due to related parties (2)		47,755		53,371		8,602
Current portion of capital lease obligation		14,600		54,984		8,862
Current portion of other long-term borrowings		—		900,000		145,054
Deferred government grants		—		6,150		991
Deferred tax liabilities		3,115		2,696		435

Total current liabilities		1,060,342		2,848,558		459,105

Non-current liabilities:
Amount due to inter-companies		240,337		1,137,850		183,388
Other long-term borrowings		900,000		—		—
Non-current portion of capital lease obligations		337,122		458,632		73,918
Unrecognized tax benefits		18,559		20,453		3,296
Deferred tax liabilities		74,417		227,821		36,718
Deferred government grants		18,046		27,422		4,420
Deferred revenue		—		74,044		11,934
Mandatorily redeemable noncontrolling interests		100,000		100,000		16,117

Total non-current liabilities		1,688,481		2,046,222		329,791

Total liabilities		2,748,823		4,894,780		788,896


	For the Year Ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Net revenues		1,527,626		2,051,248		2,695,021		434,359
Net profit		122,552		179,049		175,521		28,289


	For the Year Ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Net cash provided by operating activities		169,304			195,659			434,865			70,088
Net cash used in investing activities		(205,069	)		(1,272,863	)		(808,117	)		(130,245	)
Net cash provided by financing activities		110,076			1,168,139			480,045			77,369
Net increase in cash and cash equivalents		74,311			90,935			106,793			17,212

(1)

Amount due to inter-companies consist of intercompany payables to the other companies within the Group for the purchase of telecommunication resources and fixed assets on behalf of the Consolidated VIEs. The Consolidated VIEs had intercompany payables of RMB14,892 and RMB36,103 (US$5,819) to 21Vianet China and SZ Zhuoaiyi for accrued service fees as of December 31, 2013 and 2014, respectively. Service fees paid by the Consolidated VIEs to 21Vianet China and SZ Zhuoaiyi were RMB4,224, RMB9,924 and nil for the years ended December 31, 2012, 2013 and 2014, respectively.

(2)	Information with respect to related parties is discussed in Note 24.

(e)

Liquidity

The Group’s consolidated financial statements have been prepared on a going concern basis, which contemplates the realization of assets and liquidation of liabilities during the normal course of operations. The Group incurred net loss of approximately RMB47,003 and RMB328,477 (US$52,942) in the years ended December 31, 2013 and 2014, respectively. Accumulated deficits were RMB1,429,410 and RMB1,794,975 (US$289,297) as of December 31, 2013 and 2014, respectively. The Company is in a net current liability position of RMB122,495 (US$19,744) as of December 31, 2014. The Company believes that as a result of the signed committed investments agreements and the eventual closing of the equity investments made by Kingsoft Corporation Limited (“Kingsoft”), a leading internet based software developer, distributor and service provider, Xiaomi Corporation (“Xiaomi”), a leading designer, manufacturer and marketer of mobile devices and other electronic equipment and a provider of internet services, and Esta Investments Pte. Ltd (“Esta”), a Singapore based investment company, at end of November 2014 and on January 15, 2015 (Note 31), respectively, its available cash and cash equivalents will be sufficient to meet its working capital requirements and capital expenditures in the ordinary course of business for the next twelve months.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2014

Summary of Significant Accounting Policies

2.	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

(a)

Basis of Presentation

The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).

(b)

Principles of Consolidation

The consolidated financial statements include the financial statements of the Company, its subsidiaries and the Consolidated VIEs for which the Company or a subsidiary of the Company is the primary beneficiary. All significant inter-company transactions and balances between the Company, its subsidiaries and the Consolidated VIEs are eliminated upon consolidation. Results of acquired subsidiaries and its Consolidated VIEs are consolidated from the date on which control is transferred to the Company.

(c)

Use of estimates

The preparation of the consolidated financial statements in conformity with US GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the period. Significant estimates and assumptions reflected in the Company’s financial statements include, but are not limited to, estimating the useful lives of long-lived assets, assessing the initial valuation of the assets acquired and liabilities assumed in a business combination and the subsequent impairment assessment of long-lived assets and related goodwill, determining the provision for accounts receivable, accounting for deferred income taxes, accounting for share-based compensation arrangements, accounting for mandatorily redeemable noncontrolling interests and redeemable noncontrolling interests and accounting for capital lease. The valuation of and accounting for the Company’s purchase consideration (Note 4) also requires significant estimates and judgments provided by management. Changes in facts and circumstances may result in revised estimates. Actual results could differ from those estimates, and as such, differences may be material to the consolidated financial statements.

(d)

Foreign Currency

The functional currency of the Company and its overseas subsidiaries is the United States dollar (“US$”), whereas the functional currency of the Company’s PRC subsidiaries and its Consolidated VIEs is the Chinese Renminbi (“RMB”) as determined based on the criteria of ASC 830, Foreign Currency Matters. The Company uses the RMB as its reporting currency. Transactions denominated in foreign currencies are re-measured into the functional currency at the exchange rates prevailing on the transaction dates. Foreign currency denominated financial assets and liabilities are re-measured at the balance sheet date exchange rate. Exchange gains and losses are included in foreign exchange gains and losses in the consolidated statements of operations.

Assets and liabilities of the Company and its overseas subsidiaries are translated into RMB at fiscal year-end exchange rates. Income and expense items are translated at average exchange rates prevailing during the fiscal year. The resulting translation adjustments are recorded in other comprehensive income within the statements of comprehensive income.

(e)

Convenience Translation

Amounts in US$ are presented for the convenience of the reader and are translated at the noon buying rate of US$1.00 to RMB6.2046 on December 31, 2014 in the City of New York for cable transfers of RMB as certified for customs purposes by the Federal Reserve Bank of New York. No representation is made that the RMB amounts could have been, or could be, converted into US$ at such rate.

(f)

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand and demand deposits placed with banks or other financial institutions which are unrestricted as to withdrawal and use and have original maturities less than three months. All highly liquid investments with a stated maturity of 90 days or less from the date of purchase are classified as cash equivalents.

(g)

Restricted cash

Restricted cash mainly represents amounts held by a few banks in escrow as security for credit facilities, the guarantee of compliance with the network and service requirements of the radio spectrum license awarded by the Hong Kong Telecommunication Authority and the deposits held in escrow for the advances received from end customers subscribing Office 365 and Windows Azure services (the disbursement of which shall be agreed by both Microsoft (China) Co., Ltd. (“Microsoft”) and the Company).

(h)

Short-term investments

All highly liquid investments with stated maturities of greater than 90 days but less than 365 days are mainly fixed rate time deposits, floating-rate time deposits and floating rate principal guaranteed investments that are classified as held-to-maturity short-term investments, which are stated at their amortized costs, which approximate their estimated fair value for their short-term maturity. The Company accounts for short-term investments in accordance with ASC Topic 320 (“ASC 320”), Investments — Debt and Equity Securities. The Company classifies the short-term investments in debt and equity securities as “held-to-maturity”, “trading” or “available-for-sale”, whose classification determines the respective accounting methods stipulated by ASC 320. Dividend and interest income for all categories of investments in securities are included in earnings. Any realized gains or losses, if any, on the sale of the short-term investments are determined on a specific identification method, and such gains and losses are reflected in earnings during the period in which gains or losses are realized.

The securities that the Company has positive intent and ability to hold to maturity are classified as held-to-maturity securities and stated at amortized cost. For individual securities classified as held-to-maturity securities, the Company evaluates whether a decline in fair value below the amortized cost basis is other-than-temporary in accordance with the Company’s policy and ASC 320. When the Company intends to sell an impaired debt security or it is more-likely-than-not that it will be required to sell prior to recovery of its amortized cost basis, an other-than-temporary impairment is deemed to have occurred. In these instances, the other-than-temporary impairment loss is recognized in earnings equal to the entire excess of the debt security’s amortized cost basis over its fair value at the balance sheet date of the reporting period for which the assessment is made. When the Company does not intend to sell an impaired debt security and it is more-likely-than-not that it will not be required to sell prior to recovery of its amortized cost basis, the Company must determine whether or not it will recover its amortized cost basis. If the Company concludes that it will not, an other-than-temporary impairment exists and that portion of the credit loss is recognized in earnings, while the portion of loss related to all other factors is recognized in other comprehensive income (loss).

The securities that are bought and held principally for the purpose of selling them in the near term are classified as trading securities. Unrealized holding gains and losses for trading securities are included in earnings.

Investments not classified as trading or as held-to-maturity are classified as available-for-sale securities. Available-for-sale investment is reported at fair value, with unrealized gains and losses recorded in accumulated other comprehensive income (loss). Realized gains or losses are included in earnings during the period in which the gain or loss is realized. An impairment loss on the available-for-sale securities would be recognized in earnings when the decline in value is determined to be other-than-temporary.

No impairment loss had been recorded during each of the three years ended December 31, 2014.

(i)

Accounts Receivable and Allowance for Doubtful Accounts

Accounts receivable are carried at net realizable value. An allowance for doubtful accounts is recorded in the period when loss is probable based on an assessment of specific evidence indicating troubled collection, historical experience, accounts aging and other factors. An accounts receivable is written off after all collection effort has ceased.

(j)

Inventories

Inventories are stated at the lower of cost or market. Cost is determined using the first-in, first-out method. Adjustments to reduce the cost of inventory to its net market value are made, if required, for decreases in sales prices, obsolescence or similar reductions in the estimated net realizable value.

(k)

Property and equipment

Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows:


Category		Estimated useful life
Property		25-46 years
Leasehold improvements		Over the shorter of lease term or the estimated useful lives of the assets
Optical fibers		10-20 years
Computer and network equipment		4-11 years
Office equipment		5 years
Motor vehicles		5 years

Repair and maintenance costs are charged to expense as incurred, whereas the costs of betterments that extend the useful life of property and equipment are capitalized as additions to the related assets. Retirements, sale and disposals of assets are recorded by removing the cost and accumulated depreciation with any resulting gain or loss reflected in the consolidated statements of operations.

Property and equipment that are purchased or constructed which require a period of time before the assets are ready for their intended use are accounted for as construction-in-progress. Construction-in-progress is recorded at acquisition cost, including installation costs. Construction-in-progress is transferred to specific property and equipment accounts and commences depreciation when these assets are ready for their intended use.

(l)

Intangible assets

Intangible assets are carried at cost less accumulated amortization and any recorded impairment. Intangible assets acquired in a business combination are recognized initially at fair value at the date of acquisition. Intangible assets with finite useful lives, except for acquired customer relationships in the acquisition of the Managed Network Entities which is amortized using an accelerated method, are amortized using a straight-line method. These amortization methods reflect the estimated pattern in which the economic benefits of the respective intangible assets are to be consumed.

The Company has capitalized certain internal use software development costs in accordance with ASC Subtopic 350-40 (“ASC 350-40”), Intangibles-Goodwill and Other: Internal-Use Software, amounting to nil, RMB13,889 and RMB7,199 (US$1,160) for the years ended December 31, 2012, 2013 and 2014, respectively. The Company capitalizes certain costs relating to software acquired, developed, or modified solely to meet the Company’s internal requirements and for which there are no substantive plans to market the software. These costs mainly include the consulting and service fees paid to a third-party developer that are directly associated with the internal-use software projects during the application development stage. Capitalized internal-use software costs are included in “intangible assets, net”. The amortization expense for capitalized software costs amounted to nil, RMB1,570 and RMB8,333 (US$1,343) for the years ended December 31, 2013 and 2014, respectively. The unamortized amount of capitalized internal use software development costs was RMB12,319 and RMB9,854 (US$1,588) as of December 31, 2013 and 2014, respectively.

Intangible assets have weighted average useful lives from the date of purchase as follows:


Purchased software			6.4 years
Radio spectrum license			15 years
Network use right			20 years
Contract backlog *			5.2 years
Customer relationships *			9.5 years
Supplier relationships *			8.9 years
Licenses *			15 years
Trade Name *			15.1 years
Platform software *			5 years
Non-compete agreement *			5.1 years
Internal use software			1.6 years
Property management relationship *			9 years

Acquired in the acquisitions of subsidiaries (Note 4).

(m)

Land use rights

The land use rights represent the amounts paid and relevant costs incurred for the rights to use land in the PRC and are recorded at purchase cost less accumulated amortization. Amortization is provided on a straight-line basis over the terms of the respective land use rights certificates.

(n)

Long-term investments

The Company’s long-term investments consist of cost method investments and equity method investments.

In accordance with ASC 325-20, Investments-Other: Cost Method Investments, for investments in an investee over which the Company does not have significant influence, the Company carries the investment at cost and only adjusts for other-than-temporary declines in fair value and distributions of earnings. The Company’s management regularly evaluates the impairment of its cost method investments based on the performance and financial position of the investee as well as other evidence of estimated market values. Such evaluation includes, but is not limited to, reviewing the investee’s cash position, recent financing, projected and historical financial performance, cash flow forecasts and current and future financing needs. An impairment loss is recognized in the consolidated statements of operations equal to the excess of the investment’s cost over its fair value at the balance sheet date of the reporting period for which the assessment is made. The fair value would then become the new cost basis of investment.

Investments in equity investees represent investments in entities in which the Company can exercise significant influence but does not own a majority equity interest or control are accounted for using the equity method of accounting in accordance with ASC 323-10, Investments-Equity Method and Joint Ventures: Overall. The Company applies the equity method of accounting that is consistent with ASC 323-10 in limited partnerships in which the Company holds a three percent or greater interest. Under the equity method, the Company initially records its investment at cost and prospectively recognizes its proportionate share of each equity investee’s net profit or loss into its consolidated statements of operations. The difference between the cost of the equity investee and the amount of the underlying equity in the net assets of the equity investee is recognized as equity method goodwill included in equity method investment on the consolidated balance sheets. The Company evaluates its equity method investments for impairment under ASC 323-10. An impairment loss on the equity method investments is recognized in the consolidated statements of operations when the decline in value is determined to be other-than-temporary.

No impairment loss had been recorded during each of the three years ended December 31, 2014.

(o)

Goodwill

Goodwill represents the excess of the purchase price over the amounts assigned to the fair value of the assets acquired and the liabilities assumed of an acquired business. The Company’s goodwill as of December 31, 2013 and 2014 were mainly related to its acquisitions of the Managed Network Entities, Fastweb, iJoy, Aipu Group (2014) and Dermot Entities (2014) (Note 4). In accordance with ASC 350, Goodwill and Other Intangible Assets, recorded goodwill amounts are not amortized, but rather are tested for impairment annually or more frequently if there are indicators of impairment present. The Company has adopted Accounting Standards Update No. 2011-08 (“ASU 2011-08”), Intangibles — Goodwill and Others, pursuant to which the Company can elect to perform a qualitative assessment to determine whether the two-step impairment testing on goodwill is necessary.

The performance of the impairment test in accordance to ASC 350 involves a two-step process. The first step of the impairment test involves comparing the fair value of the reporting unit with its carrying amount, including goodwill. Fair value is primarily determined by computing the future discounted cash flows expected to be generated by the reporting unit. If the reporting unit’s carrying value exceeds its fair value, goodwill may be impaired. If this occurs, the Company performs the second step of the goodwill impairment test to determine the amount of impairment loss.

The fair value of the reporting unit is allocated to its assets and liabilities in a manner similar to a purchase price allocation in order to determine the implied fair value of the reporting unit’s goodwill. If the implied goodwill fair value is less than its carrying value, the difference is recognized an impairment loss.

In accordance with ASC 350, the Company assigned and assessed goodwill for impairment at the reporting unit level. A reporting unit is an operating segment or one level below the operating segment. The Company has determined it has one reporting unit, which is also its only operating segment. Goodwill that has arisen as a result of the acquisitions of subsidiaries was assigned to this reporting unit.

In 2014, the Company elected to assess goodwill for impairment using the two-step process. As of October 1, 2014, the Company completed its annual impairment test for goodwill that has arisen out of its acquisitions. The Company determined the fair value of the reporting unit using the income approach based on the discounted expected cash flows associated with the reporting unit. The discounted cash flows for the reporting unit were based on six year projections. Cash flow projections were based on past experience, actual operating results and management best estimates about future developments as well as certain market assumptions. Cash flows after six years were estimated using a terminal value calculation, which considered terminal value growth at 3%, considering the long term revenue growth for entities in a similar industry in the PRC. The discount rate of approximately 13% was derived and used in the valuations which reflect the market assessment of the risks specific to the Company and its industry and is based on its weighted average cost of capital. The resulting fair value of the reporting unit was higher than its carrying value, and as such, the Company was not required to complete the second step; therefore, no impairment losses were recognized in 2014. Similarly, pursuant to the goodwill impairment tests in 2012 and 2013, no impairment losses were recognized.

(p)

Impairment of long-lived assets

The Company evaluates its long-lived assets or asset group, including intangible assets with finite lives, for impairment whenever events or changes in circumstances (such as a significant adverse change to market conditions that will impact the future use of the assets) indicate that the carrying amount of an asset or a group of long-lived assets may not be recoverable. When these events occur, the Company evaluates for impairment by comparing the carrying amount of the assets to future undiscounted net cash flows expected to result from the use of the assets and their eventual disposition. If the sum of the expected undiscounted cash flow is less than the carrying amount of the assets, the Company would recognize an impairment loss based on the excess of the carrying amount of the asset group over its fair value. Fair value is generally determined by discounting the cash flows expected to be generated by the assets, when the market prices are not readily available for the long-lived assets. No impairment charge was recognized for each of the three years ended December 31, 2014.

(q)

Fair value of financial instruments

The Company’s financial instruments include cash and cash equivalents, restricted cash, short-term investments, accounts receivable and payable, other receivables and payables, bonds payable, short-term and long-term bank and other borrowings, share-settled bonuses, mandatorily redeemable noncontrolling interests and balances with related parties. Other than the bonds payable, long-term bank and other borrowings, share-settled bonuses, mandatorily redeemable noncontrolling interests and the contingent consideration payable included in the balances with related parties, the carrying values of these financial instruments approximate their fair values due to their short-term maturities.

The carrying amounts of long-term bank and other borrowings approximate their fair values since they bear interest rates which approximate market interest rates. The contingent considerations in both cash and shares and share-settled bonuses are initially measured at fair value on the acquisition dates of the acquired businesses (Note 4) and the date of grant, respectively, and subsequently remeasured at the end of each reporting period with an adjustment for fair value recorded to the current period expense. The mandatorily redeemable noncontrolling interest is initially recognized at its issuance value. The Company recognizes changes in the redemption value based on the higher of its redemption value at the end of each reporting period and the original issuance value as interest expense.

The Company, with the assistance of an independent third party valuation firm, determined the estimated fair value of the contingent consideration in both cash and shares and mandatorily redeemable controlling interests that are recognized in the consolidated financial statements. Based on the quoted market price as of December 31, 2014, the fair value of the bonds payable was RMB2,211,274 (US$356,393) (Note 29).

(r)

Revenue recognition

The Company provides hosting and related services including hosting of customers’ servers and networking equipment, connecting customers’ servers with internet backbones, content delivery network services optimizing speed and security of data transmission, virtual private network services providing encrypted secured connection to public internet and other value-added services.

The Company also provides managed network services to enable its customers to deliver data across the internet in a faster and more reliable manner through extensive data transmission network and BroadEx smart routing technology, and to get the last-mile broadband internet connection services in large metro areas in China.

Consistent with the criteria under ASC topic 605 (“ASC 605”), Revenue Recognition, the Company recognizes revenue from sales of these services when there is a signed sales agreement with fixed or determinable fees, services have been provided to the customer and collection of the resulting customer’s receivable is reasonably assured.

The Company’s services are provided under the terms of a master service agreement, which will typically accompany a one-year term renewal option with the same terms and conditions. Customers can choose at the outset of the arrangement to either use the Company’s services through a monthly fixed fee arrangement or choose a plan based on actual bandwidth or traffic volume used during the month at fixed pre-set rates. The Company recognizes and bills for revenue for excess usage, if any, in the month of its occurrence to the extent a customer’s usage of the services exceeds their pre-set monthly fixed bandwidth usage and fee arrangements. The rates as specified in the master service agreements are fixed for the duration of the contract term and are not subject to adjustment.

The Company may charge its customers an initial set-up fee prior to the commencement of their services. The Company’s records these initial set-up fees as deferred revenue and recognizes revenue ratably over the period of the customer service agreement. Generally, all the Company’s customers’ service agreements will require some amount of initial set-up along with the selected service subscription.

The Company made sales of software for the Cloud Content Delivery Network (“CDN”) system developed using the Company’s CDN platform technology know-hows. Revenue is recognized when all of the four basic criteria under ASC605-10 are met. In cases where the Company sold software together with post contract services (“PCS”), the arrangement is accounted for as a multiple element arrangement and the arrangement revenue is allocated based on the vendor-specific objective evidence (“VSOE”) of fair value of the products and services. All revenue from the arrangement is deferred and recognized over the PCS term when the VSOE of fair value does not exist.

The Company provides last-mile wired broadband Internet access services, sometimes bundled with broadband related products, to individual and corporate customers at agreed prices. The Company allocates the contract price based on the relative selling price method under with the selling price of each deliverable determined using VSOE of selling price, third-party evidence (“TPE”) of selling price, or management’s best estimate of the selling price (“BESP”). The Company considers all reasonably available information in determining the BESP, including both market and entity-specific factors. Revenues are recognized for each deliverable when all four criteria under ASC605-10 are met.

The Company evaluates whether it is appropriate to record the gross amount of service sales and related costs or the net amount earned as commissions. Generally, when the Company is primarily obligated in a transaction, have latitude in establishing prices and / or selecting suppliers, or have several but not all of these indicators, revenue is recorded at the gross sale price. The Company generally records the net amounts as commissions earned if we are not primarily obligated and do not have latitude in establishing prices. Such amounts earned are determined using a fixed percentage of the gross sales price.

Cash received in advance from customers that are expected to be recognized as revenue upon completion of performance obligations is recorded as deferred revenue when there is no general right of refund; otherwise, it is recorded as advances from customers.

Business tax on revenues earned from provision of services to customers is recorded as a deduction from gross revenue to derive net revenue in the same period in which the related revenue is recognized. Most of the Company’s PRC subsidiaries and its Consolidated VIEs are subject to a business tax rate of 3% or 5%. The business tax expenses and other surcharges for the years ended December 31, 2012, 2013 and 2014 amounted to RMB56,106, RMB59,554 and RMB25,202 (US$4,062), respectively. Effective in September 2012, a value-added tax, or VAT, of 6%, replaced the original business tax in Beijing as a result of the PRC government’s pilot VAT reform program, which applies to all services provided by 21 Vianet China and certain services provided by 21 Vianet Technology and 21 Vianet Beijing. Effective since June 2014, VAT of 6% replaced the original business tax for all telecommunication services provided in Mainland China.

(s)

Cost of revenues

Cost of revenues consists primarily of telecommunication costs, depreciation of the Company’s long-lived assets, amortization of acquired intangible assets, maintenance, data center rental expenses directly attributable to the provision of the IDC services, payroll and other related costs of operations.

Prior to September 2012, 21Vianet China was subject to business tax and other surcharges on the revenues earned for exclusive business support, technical and consulting services provided to 21Vianet Technology, pursuant to the VIE agreements (Note 1(b)). Since September 2012, all services provided by 21Vianet China are subject to VAT. Effective since June 2014, all the services provided by the group in Mainland China, including VIEs are subject to VAT. Such business tax, VAT (to the extent nondeductible) and other surcharges were charged to cost of revenues as the related technical, consulting and rental services are rendered.

(t)

Advertising expenditures

Advertising expenditures are expensed as incurred and are included in sales and marketing expenses, which amounted to RMB4,426, RMB2,664 and RMB19,687 (US$3,173) for the years ended December 31, 2012, 2013 and 2014, respectively.

(u)

Research and development expenses

Research and development expenses consist primarily of payroll and related personnel costs for routine upgrades and related enhancements of the Company’s services and network. Research and development expenses are expensed as incurred.

(v)

Government grants

Government grants are provided by the relevant PRC municipal government authorities to subsidize the cost of certain research and development projects. The amount of such government grants are determined solely at the discretion of the relevant government authorities and there is no assurance that the Company will continue to receive these government grants in the future. Government grants are recognized when it is probable that the Company will comply with the conditions attached to them, and the grants are received. When the grant relates to an expense item, it is recognized in the statement of operations over the period necessary to match the grant on a systematic basis to the costs that it is intended to compensate, as a reduction of the related operating expense. When the grant relates to an asset, it is recognized as deferred government grants and released to the statement of operations in equal amounts over the expected useful life of the related asset, when operational, as a reduction of the related depreciation expense.

(w)

Leases

Leases are classified at the inception date as either a capital lease or an operating lease. The Company did not enter into any leases whereby it is the lessor for any of the periods presented. As the lessee, a lease is a capital lease if any of the following conditions exists: a) ownership is transferred to the lessee by the end of the lease term, b) there is a bargain purchase option, c) the lease term is at least 75% of the property’s estimated remaining economic life, or d) the present value of the minimum lease payments at the beginning of the lease term is 90% or more of the fair value of the leased property to the lessor at the inception date. A capital lease is accounted for as if there was an acquisition of an asset and an incurrence of an obligation at the inception of the lease. The Company entered into capital leases for certain fiber optic cables, network equipment and property in the years ended December 31, 2012, 2013 and 2014.

All other leases are accounted for as operating leases wherein rental payments are expensed on a straight-line basis over the periods of their respective lease terms. The Company leases office space and employee accommodation under operating lease agreements. Certain lease agreements contain rent holidays and escalating rent. Rent holidays and escalating rent are considered in determining the straight-line rent expense to be recorded over the lease term. The lease term begins on the date of initial possession of the lease property for purposes of recognizing lease expense on a straight-line basis over the term of the lease.

(x)

Capitalized interest

Interest costs are capitalized if they are incurred during the acquisition, construction or production of a qualifying asset and such costs could have been avoided if expenditures for these assets have not been made.

As a result of total interest costs capitalized during the period, the interest expense for the year ended December 31, 2012, 2013 and 2014, was as follows:


	2012			2013			2014
	RMB			RMB			RMB			US$
Interest expense and amortization cost of bonds		—			69,785			130,355			21,009
Interest expense on bank and other borrowings		17,807			43,839			66,699			10,750
Interest expense on capital lease		5,287			31,863			40,849			6,584

Total interest costs		23,094			145,487			237,903			38,343

Less: Total interest costs capitalized		(11,718	)		(8,712	)		(5,883	)		(948	)

Interest expense, net		11,376			136,775			232,020			37,395

(y)

Income taxes

The Company accounts for income taxes using the liability method. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial reporting and tax bases of assets and liabilities using enacted tax rates that will be in effect in the period in which the differences are expected to reverse. The Company records a valuation allowance against deferred tax assets if, based on the weight of available evidence, it is more-likely-than-not that some portion, or all, of the deferred tax assets will not be realized. The effect on deferred taxes of a change in tax rates is recognized in income in the period that includes the enactment date.

The Company applies ASC 740, Accounting for Income Taxes, to account for uncertainty in income taxes. ASC 740 prescribes a recognition threshold a tax position is required to meet before being recognized in the financial statements.

The Company has elected to classify interest and penalties related to unrecognized tax benefits, if and when required, as part of “income tax” in the consolidated statements of operations.

(z)

Share-based compensation

Share options and Restricted Share Units (“RSUs”) granted to employees are accounted for under ASC 718, Compensation — Stock Compensation, which requires that share-based awards granted to employees be measured based on the grant date fair value and recognized as compensation expense over the requisite service period and/or performance period (which is generally the vesting period) in the consolidated statements of operations.

The Company has elected to recognize compensation expense using the straight-line method for share-based awards granted with service conditions that have a graded vesting schedule. For share-based awards granted with performance conditions, the Company recognizes compensation expense using the accelerated method. The Company commences recognition of the related compensation expense if it is probable that the defined performance condition will be met. To the extent that the Company determines that it is probable that a different number of share-based awards will vest depending on the outcome of the performance condition, the cumulative effect of the change in estimate is recognized in the period of change.

For the performance bonuses that the employees can elect to settle in cash and/or restricted shares (at an agreed premium) of the Company, the Company estimates the portion of the arrangement to be settled in equity based on its past settlement practices and classifies such portion as a liability in accordance with ASC718. The Company remeasures the fair value of such liability at each reporting period end through earnings until the actual settlement date, which is the date when the underlying shares were granted to the employees. Subsequent to the settlement date, although the Company accounts for these restricted shares units as an equity award, the original cash bonus amount continues to be classified as a liability within “Accrued expenses and other payables-Others” in the consolidated balance sheets until the end of the six months’ lock-up period as such amounts will be paid to the employees in cash upon the termination of their employment. The fair value of the premium that is vested and unvested will be reclassified to additional paid in capital and recognized over the remaining lock-up period using the accelerated method, respectively.

ASC 718 requires forfeitures to be estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from initial estimates. The forfeiture rate is estimated based on historical and future expectations of employee turnover rates and are adjusted to reflect future changes in facts and circumstances, if any.

Share-based compensation expense is recorded net of estimated forfeitures such that expense is recorded only for those share-based awards that are expected to vest. To the extent the Company revises this estimate in the future, the share-based payments could be materially impacted in the period of revision, as well as in following periods. During the years ended December 31, 2012 and 2013, the Company estimated that the forfeiture rate for both the management and non-management employees of the Company was zero. For the year ended 2014, the Company estimated that the forfeiture rate for both the management and non-management employees of the Company was 1.66%.

(aa)

Earnings per share

In accordance with ASC 260, Earnings per Share, basic earnings per share is computed by dividing net earnings / loss attributable to ordinary shareholders by the weighted average number of unrestricted ordinary shares outstanding during the year. Diluted earnings per share is calculated by dividing net profit attributable to ordinary shareholders as adjusted for the effect of dilutive ordinary equivalent shares, if any, by the weighted average number of ordinary and dilutive ordinary equivalent shares outstanding during the period. Contingently issuable shares, including performance-based share awards and contingent considerations to be settled in shares, are included in the computation of basic earnings per share only when there is no circumstance under which those shares would not be issued. Contingently issuable shares are included in the denominator of the diluted EPS calculation as of the beginning of the period or as of the inception date of the contingent share arrangement, if later, only when dilutive and when all the necessary conditions have been satisfied as of the reporting period end. For contracts that may be settled in ordinary shares or in cash at the election of the Company, share settlement is presumed, pursuant to which incremental shares relating to the number of shares that would be required to settle the contract are included in the denominator of diluted EPS calculation if the effect is more dilutive. For the contracts that may be settled in ordinary shares or in cash at the election of the counterparty, the more dilutive option of cash or share settlement is used for the purposes of diluted EPS calculation, pursuant to which share settlement requires the number of shares that would be required to settle the contract be included in the denominator whereas cash settlement requires an adjustment will be made to the numerator for any changes in income or loss that would result as if the contract had been classified as an asset or liability for accounting purposes during the period for a contract that is classified as equity for accounting purposes, if the effect is more dilutive. Ordinary equivalent shares consist of the ordinary shares issuable upon the exercise of the share options, using the treasury stock method. Ordinary share equivalents are excluded from the computation of diluted per share if their effects would be anti-dilutive.

(bb)

Share repurchase program

Pursuant to a Board of Directors’ resolution on September 5, 2013, the Company’s management is authorized to repurchase up to US$10,000 of the company’s ADSs (“Share Repurchase Plan I”). During the period from September 5, 2013 to December 31, 2013, the Company repurchased 586,869 ADSs, under this plan for a consideration of RMB59,822.

Pursuant to the Board of Directors’ resolutions on August 26, 2014 and September 4, 2014, the Company’s management is authorized to repurchase up to US$5,000 and US$100,000 of the company’s ADSs respectively (“Share Repurchase Plan II”). During the period from September 2, 2014 to December 31, 2014, the Company repurchased 1,553,085 ADSs, under this plan for a consideration of approximately RMB213,665 (US$34,437).

The Company accounted for the repurchased shares as Treasury Stock at cost in accordance to ASC 505-30, Treasury Stock, and the repurchase shares are shown separately in the statement of shareholder’s equity, as the Company has not yet decided on the ultimate disposition of those ADSs acquired. When the Company uses the treasury stock to settle the share consideration for the acquisitions (Note 19), the difference between the fair value at settlement date and the repurchase price is debited into additional paid-in capital. When the Company decides to retire the treasury stock, the difference between the original issuance price and the repurchase price is debited into additional paid-in capital.

(cc)

Comprehensive income (loss)

Comprehensive income (loss) is defined as the increase (decrease) in equity of the Company during a period from transactions and other events and circumstances excluding transactions resulting from investments by owners and distributions to owners. Accumulated other comprehensive loss of the Company includes foreign currency translation adjustments related to the Company and its overseas subsidiaries, whose functional currency is US$.

(dd)

Segment reporting

The Company’s chief operating decision-maker, who has been identified as the Chief Executive Officer, reviews the consolidated results when making decisions about allocating resources and assessing performance of the Company as a whole and hence, the Company has only one operating and reportable segment. The Company operates and manages its business as a single segment. As the Company’s long-lived assets are substantially all located in the PRC and substantially all the Company’s revenues are derived from within the PRC, no geographical segments are presented.

(ee)

Employee benefits

The full-time employees of the Company’s PRC subsidiaries are entitled to staff welfare benefits including medical care, housing fund, pension benefits and unemployment insurance, which are governmental mandated defined contribution plans. These entities are required to accrue for these benefits based on certain percentages of the employees’ respective salaries, subject to certain ceilings, in accordance with the relevant PRC regulations, and make cash contributions to the state-sponsored plans out of the amounts accrued.

(ff)

Comparative information

Certain items reported in the prior year’s consolidated financial statements have been reclassified to conform to the current year’s presentation.

(gg)

Recent accounting pronouncements

In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers. ASU 2014-09 outlines a comprehensive model for entities to use in accounting for revenue arising from contracts with customers and supersedes most current revenue recognition guidance, including industry-specific guidance. The core principle of the revenue model is that an entity recognizes revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ASU 2014-09 also requires significantly expanded disclosures about revenue recognition. For public entities, ASU 2014-09 is effective for annual reporting periods (including interim reporting periods within those periods) beginning after December 15, 2016. Early adoption is not permitted. The Company is currently evaluating the impact of the adoption of ASU 2014-09 on the Group’s consolidated financial statements.

In August 2014, the FASB issued ASU 2014-15, Presentation of Financial Statements — Going Concern (Subtopic 205-40), Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern. The guidance requires an entity to evaluate whether there are conditions or events, in the aggregate, that raise substantial doubt about the entity’s ability to continue as a going concern within one year after the date that the financial statements are issued and to provide related footnote disclosures in certain circumstances. The guidance is effective for the annual period ending after December 15, 2016, and for annual and interim periods thereafter. Early application is permitted. The Company has not yet adopted ASU 2014-15 and is currently in the process of evaluating the impact of the adoption of the update on the consolidated financial statements.

Concentration of Risks

12 Months Ended

Dec. 31, 2014

Risks and Uncertainties [Abstract]

Concentration of Risks

3.	CONCENTRATION OF RISKS

(a)

Credit risk

Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash and cash equivalents, short-term investments, accounts receivable, other receivables and amounts due from related parties. As of December 31, 2013 and 2014, the aggregate amount of cash and cash equivalents, restricted cash and short-term investments of RMB1,450,939 and RMB1,557,334 (US$250,997), respectively, were held at major financial institutions located in the PRC, and US$251,387 and US$45,352 (RMB281,387), respectively, were deposited with major financial institutions located outside the PRC. Management believes that these financial institutions are of high credit quality and continually monitors the credit worthiness of these financial institutions. Historically, deposits in Chinese banks are secure due to the state policy on protecting depositors’ interests. However, China promulgated a new Bankruptcy Law in August 2006 that came into effect on June 1, 2007, which contains a separate article expressly stating that the State Council may promulgate implementation measures for the bankruptcy of Chinese banks based on the Bankruptcy Law. Under the new Bankruptcy Law, a Chinese bank may go into bankruptcy. In addition, since China’s concession to the World Trade Organization, foreign banks have been gradually permitted to operate in China and have been significant competitors against Chinese banks in many aspects, especially since the opening of the Renminbi business to foreign banks in late 2006. Therefore, the risk of bankruptcy of those Chinese banks in which the Company has deposits has increased. In the event of bankruptcy of one of the banks which holds the Company’s deposits, it is unlikely to claim its deposits back in full since it is unlikely to be classified as a secured creditor based on PRC laws.

(b)

Business, supplier, customer, and economic risk

The Company participates in a relatively dynamic and competitive industry that is heavily reliant operation excellence of the services. The Company believes that changes in any of the following areas could have a material adverse effect on the Company’s future financial position, result of operations or cash flows:

(i) Business Risk — Third parties may develop technological or business model innovations that address data centre and network requirements in a manner that is, or is perceived to be, equivalent or superior to the Company’s services. If competitors introduce services that compete with, or surpass the quality, price or performance of the Company’s services, the Company may be unable to renew its agreements with existing customers or attract new customers at the prices and levels that allow the Company to generate reasonable rates of return on its investment.

(ii) Supplier Risk — The Company’s operations are dependent upon bandwidth and cabinet capacity provided by the third-party telecom carriers. There can be no assurance that the Company will be able to secure the cabinet and bandwidth supply from the third-party telecom carriers, neither the Company is adequately prepared for unexpected increases in bandwidth demands by its customers. The communications capacity the Company has leased, include cabinet and bandwidth, may become unavailable for a variety of reasons, such as physical interruption, technical difficulties, contractual disputes, or the financial health of its third-party providers. Any failure of these network providers to provide the capacity the Company requires may result in a reduction in, or interruption of, service to its customers. A significant portion of the Company’s total bandwidth and cabinet resources are purchased from its four largest suppliers, who collectively accounted for 23%, 23% and 21% of the Company’s total bandwidth and cabinet resources for the years ended December 31, 2012, 2013 and 2014, respectively.

(iii) Customer Risk — The success of the Company’s business going forward will rely in part on Company’s ability to continue to obtain and expand business from existing customers while also attracting new customers. The Company has a diversified base of customers covering its services and the revenue from the largest single customer accounted for less than 4% of the Company’s total net revenues in each of the three years ended December 31, 2014. Certain customers are local subsidiaries of a telecommunication carrier in China, which the Company views as separate customers as it negotiates with, maintain and support each of these entities given that each of them has the separate decision-making authority and services procurement budget. None of these customers on a stand-alone basis contributed more than 4% of the Company’s revenues in any given year but in the aggregate, they contributed approximately 22%, 16% and 7% of the Company’s total revenues for the years ended December 31, 2012, 2013 and 2014, respectively.

(iv) Political, economic and social uncertainties — The Company’s operations could be adversely affected by significant political, economic and social uncertainties in the PRC. Although the PRC government has been pursuing economic reform policies for more than 20 years, no assurance can be given that the PRC government will continue to pursue such policies or that such policies may not be significantly altered, especially in the event of a change in leadership, social or political disruption or unforeseen circumstances affecting the PRC political, economic and social conditions. There is also no guarantee that the PRC government’s pursuit of economic reforms will be consistent or effective.

(v) Regulatory restrictions — The applicable PRC laws, rules and regulations currently prohibit foreign ownership of companies that provide internet related services, including hosting, content delivery network services, managed network services and virtual private internet services. Accordingly, the Company’s subsidiary, 21Vianet China, is currently ineligible to apply for the required licenses for providing IDC services in China. As a result, the Company operates its IDC services in the PRC through its Consolidated VIEs which holds the licenses and permits required to provide IDC services in the PRC. The PRC Government may also choose at anytime to block access to certain website operators which could also materially impact the Company’s ability to generate revenue.

(c)

Currency convertibility risk

The Company transacts substantially all its business in RMB, which is not freely convertible into foreign currencies. On January 1, 1994, the PRC government abolished the dual-rate system and introduced a single rate of exchange as quoted daily by the People’s Bank of China (the “PBOC”). However, the unification of the exchange rates does not imply that the RMB may be readily convertible into US$ or other foreign currencies. All foreign exchange transactions continue to take place either through the PBOC or other banks authorized to buy and sell foreign currencies at the exchange rates quoted by the PBOC. Approval of foreign currency payments by the PBOC or other institutions requires submitting a payment application form together with suppliers’ invoices, shipping documents and signed contracts.

(d)

Foreign currency exchange rate risk

From July 21, 2005, the RMB is permitted to fluctuate within a narrow and managed band against a basket of certain foreign currencies. The appreciation (depreciation) of the RMB against US$ was approximately 0.2%, 3.0% and (0.4) % in the years ended December 31, 2012, 2013 and 2014, respectively. While the international reaction to the appreciation of the RMB has generally been positive, there remains significant international pressure on the PRC Government to adopt an even more flexible currency policy, which could result in a further and potentially more significant appreciation of the RMB against the US$.

Acquisitions

12 Months Ended

Dec. 31, 2014

Business Combinations [Abstract]

Acquisitions

4.	ACQUISITIONS

Business combinations in 2014

The Group completed the following acquisitions in 2014, which have been accounted for as business combinations:

Aipu Group

To expand the reach of the Company’s data transmission network into regional last-mile access networks, further strengthening its position as a leading integrated internet infrastructure services provider in China, on May 31, 2014, the Company acquired from third party selling shareholders (the “Selling Shareholder”) the controlling interest represented by 50% equity interests plus one share of Aipu Group, one of the largest regional internet service providers in Southwest China, for a total purchase consideration of RMB748,971(US$120,712), as follow:


	RMB		US$
Cash consideration (i)		700,000		112,820
Contingent consideration in cash (ii) *		48,971		7,892

Total fair value of purchase price consideration		748,971		120,712

The Company determined the fair value of the contingent consideration with the assistance of an independent third party valuation firm.

Details of the purchase consideration are as follows:

RMB700,000 of the above cash consideration was paid in 2014.

ii.

The contingent consideration in cash was determined based on the achievement by Aipu Group of certain revenue and net profit targets as well as certain operational performance targets in accordance with the sales and purchase agreement for the fiscal years 2014, 2015 and 2016. The Company determined the fair value of the contingent cash consideration as of the acquisition date and at the end of 2014 with the assistance of an independent third party valuation firm based on the Company’s assessment of whether Aipu Group will meet the aforementioned contractually stipulated targets. The outstanding contingent consideration amount was recorded in the “Amount due to related parties” balance within the Company’s consolidated balance sheets (Note 24).

The sale and purchase agreement also provided put options that allows the Selling Shareholders to sell the remaining 50% equity interests in the Aipu Group in three tranches, namely 28% equity interest in 2015, 11% equity interest in 2016 and the remaining equity interests (including those in 2015 and 2016 if these put options are not exercised) in 2017 for a consideration determined using certain financial or operational targets with a floor of RMB700,000 or a ceiling of RMB800,000, in aggregate. A portion of the consideration is to be settled in cash based on certain financial target stipulated in the sale and purchase agreement. The difference will be settled in cash or shares, with the option to settle in cash or shares residing with the Selling Shareholders for the first tranche and the Company in the subsequent tranches.

The noncontrolling interests are to be redeemed by the Company at the option of the Selling Shareholders in return for cash and shares where the maximum number of shares required to be delivered is outside of the control of the Company, and thus are accounted for as redeemable noncontrolling interests. The Company elects to recognize the changes in redemption value immediately as they occur and adjust the carrying amount of the noncontrolling interests to the redemption value at the end of each reporting period as if it is the redemption date in accordance with ASC topic 480 (“ASC 480”), Distinguishing Liabilities from Equity. As the remaining 50% equity interests are held by a few noncontrolling shareholders where the underlying shares of the Aipu Group are not publicly traded, the put options are embedded features in the Aipu Group’s shares, which does not qualify for bifurcation accounting. The put options are recognized as part of redeemable noncontrolling interests (Note 28). The redeemable noncontrolling interests were initially recorded at acquisition date fair value and subsequently adjusted to the balance after attribution of Aipu Group’s net income pursuant to ASC 810, Consolidation, and the redemption value pursuant to ASC 480, whichever is greater. Adjustments to the carrying amount of redeemable noncontrolling interests pursuant to ASC 480, if any, are charged to additional paid-in capital.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date of May 31, 2014:


	RMB			US$
Current assets		100,741			16,236
Other non-current assets		15,243			2,457
Property and equipment, net		681,979			109,915
Customer relationships (Note 10)		456,079			73,507
Trade names (Note 10)		110,748			17,849
Property management relationship (Note 10)		86,873			14,001
Non-compete agreements (Note 10)		26,670			4,298
Supplier relationships (Note 10)		23,453			3,780
Licenses (Note 10)		10,744			1,732
Purchased softwares		9,819			1,583
Land use right		12,143			1,957

Total assets acquired		1,534,492			247,315

Accounts and notes payable		(31,097	)		(5,012	)
Deferred revenue-current		(390,000	)		(62,857	)
Other current liabilities		(190,317	)		(30,673	)
Deferred tax liabilities-non-current		(124,356	)		(20,043	)
Other non-current liabilities		(1,367	)		(220	)

Total liabilities assumed		(737,137	)		(118,805	)

Net assets acquired		797,355			128,510
Purchase considerations		748,971			120,712
Fair value of redeemable non-controlling interests with the embedded put options (Note 28)		748,040			120,562

Goodwill		699,656			112,764

The revenue and net profit of Aipu Group since the acquisition date included in the consolidated statement of operations for the year ended December 31, 2014 were RMB385,032 (US$62,056) and RMB41,290 (US$6,655), respectively. The goodwill, which is not tax deductible, is primarily attributable to synergies expected to be achieved from the acquisition.

Dermot Entities

As part of the Company’s business strategy to expand into the Virtual Private Network (“VPN”) market, the Group acquired 100% equity interests in the Dermot Entities from a third party selling shareholder, on August 10, 2014 for a total purchase consideration of RMB953,567 (US$153,687).


	RMB		US$
Cash consideration (i)		598,500		96,461
Contingent ordinary shares issuance * (ii) (iii)		355,067		57,226

Total fair value of purchase price consideration		953,567		153,687

The Company determined the fair value of the contingent share consideration with the assistance of an independent third party valuation firm.

Details of the purchase consideration are as follows:

RMB 598,500 of the above cash consideration was paid in 2014.

ii.

The contingent consideration in shares are determined based on the achievement by Dermot Entities of certain financial targets in accordance with the sales and purchase agreement for the fiscal years 2014 and 2015 as well as compliance to the terms of the sales and purchase agreement. The above contingent consideration amounts were derived from the Company’s assessment of whether Dermot Entities will meet the contractually stipulated targets. The outstanding contingent consideration related to fiscal 2014 and 2015 has been recorded in the “Amount due to related parties” balance within the Company’s statement of financial position.

iii.

As the contingent consideration in shares is predominately derived from a financial performance parameter other than the fair value of the issuer’s shares, it is liability-classified and is remeasured at the end of each reporting period with an adjustment for fair value recorded to the current period expense.

The sale and purchase agreement also provided (i) 237,874 restricted share units to be settled in cash or shares at the Company’s option and (ii) cash payments if the financial performance for fiscal years 2014 and 2015 exceed certain agreed-upon financial targets, to be granted and paid to certain Dermot Entities management over agreed requisite service periods subsequent to the acquisition. The related compensation for post-acquisition services provided by the employees is accounted as compensation and recorded in the Company’s consolidated statements of operations (Note 22(c)).

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the date of acquisition:


	RMB			US$
Current assets		77,886			12,552
Other non-current assets		655			106
Property and equipment, net		40,006			6,448
Customer relationships (Note 10)		207,767			33,486
Trade name (Note 10)		116,266			18,739
Contract backlog (Note 10)		34,259			5,522
Licenses (Note 10)		3,772			608
Supplier relationships (Note 10)		30,073			4,847
Purchased softwares		360			58

Total assets acquired		511,044			82,366

Accounts and notes payable		(39,293	)		(6,333	)
Other current liabilities		(42,555	)		(6,859	)
Deferred tax liabilities-non-current		(81,657	)		(13,161	)
Other non-current liabilities		(3,372	)		(543	)

Total liabilities assumed		(166,877	)		(26,896	)

Net assets acquired		344,167			55,470
Purchase consideration		953,567			153,687

Goodwill		609,400			98,217

The revenue and net profit of Dermot Entities since the acquisition date included in the consolidated statement of operations for the year ended December 31, 2014 were RMB193,235 (US$31,144) and RMB9,542 (US$1,538), respectively.

The goodwill, which is not tax deductible, is primarily attributable to synergies expected to be achieved from the acquisition.

Other acquisitions

As part of the Company’s business strategy to expand the existing hosting service, the Company completed other several less significant acquisitions in 2014. The aggregate consideration for the three acquisitions is RMB 64,232 (US$ 10,352), as follow:


	RMB		US$
Cash consideration (i)		49,554		7,986
Contingent consideration in cash* (ii)		7,339		1,183
Contingent ordinary shares issuance* (ii) (iii)		7,339		1,183

Total fair value of purchase price consideration		64,232		10,352

The Company determined the fair value of the contingent share consideration with the assistance of an independent third party valuation firm.

Details of the purchase consideration are as follows:

RMB49,554 of the above cash consideration was paid in 2014.

ii.

The contingent consideration in both cash and shares are determined based on the achievement by Guangdong Tianying Information Technology., Co., Ltd. (“GD Tianying”) of certain financial and operational targets in accordance with the sales and purchase agreement for the fiscal years 2014, 2015 and 2016 as well as compliance to the terms of the sales and purchase agreement. The above contingent consideration amounts were derived from the Company’s assessment of whether GD Tianying will meet the contractually stipulated targets. The outstanding contingent consideration related to fiscal 2014, 2015 and 2016 has been recorded in the “Amount due to related parties” balance within the Company’s Consolidated Balance Sheets.

iii.

As the contingent consideration of GD Tianying in shares is predominately derived from a financial and operational performance parameter other than the fair value of the issuer’s shares, it is liability-classified and is remeasured at the end of each reporting period with an adjustment for fair value recorded to the current period expense.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the date of acquisition:


	RMB			US$
Current assets		13,472			2,171
Other non-current assets		262			42
Property and equipment, net		15,912			2,565
Licenses		896			144
Supplier Relationship		14,516			2,340
Customer Relationships		9,381			1,512
Non-compete agreements		300			48

Total assets acquired		54,739			8,822

Accounts and notes payable		(5,768	)		(930	)
Other current liabilities		(10,124	)		(1,631	)
Deferred revenue-non-current		(750	)		(121	)
Deferred tax liabilities-non-current		(4,683	)		(755	)

Total liabilities assumed		(21,325	)		(3,437	)

Net assets acquired		33,414			5,386
Purchase consideration		64,232			10,352
Fair value of noncontrolling interests		5,597			902

Goodwill		36,415			5,869

The revenue and net profit since the acquisition dates included in the consolidated statement of operations for the year ended December 31, 2014 were RMB20,515 (US$3,306) and RMB4,898 (US$789), respectively.

The goodwill, which is not tax deductible, is primarily attributable to synergies expected to be achieved from the acquisition.

Assets acquisition in 2014

On September 30, 2014, the Company through its subsidiary, 21Vianet Beijing acquired 100% equity interests in Beijing Yichengtaihe Investment Co., Ltd (“BJ Yichengtaihe”) with the total consideration of RMB198,846 (US$32,049). The purpose is to establish a new data center with the acquired property and electricity equipment. As BJ Yichengtaihe does not possess all the elements that are necessary to conduct normal operations as a business and had not yet commenced operations, such acquisition is accounted for as an acquisition of assets. As of September 30, 2014, the fair values of the net identifiable assets of BJ Yichengtaihe are as follows:


	RMB			US$
Net assets acquired:
Property		160,974			25,944
Land use right		54,489			8,782
Equipment		25,661			4,136
Cash and cash equivalent		1,098			177
Other current liabilities		(1,008	)		(162	)
Deferred tax liabilities		(42,368	)		(6,828	)

Total consideration in cash		198,846			32,049

Business combinations before 2014

The Group completed the following acquisitions in 2012 and 2013, which were accounted for as business combinations:

Tianwang and Yilong

As part of the Company’s business strategy to expand into the VPN market and to expand the Company’s existing managed network services (“MNS”), the Company acquired 100% of the equity interests in Tianwang and Yilong on February 28, 2013 for a total purchase consideration of RMB73,389, as follows:


	RMB
Cash consideration (i)		17,500
Share consideration * (ii)		10,455
Contingent consideration in cash * (iii)		19,977
Contingent ordinary shares issuance * (iii) (iv)		25,457

Total fair value of purchase price consideration		73,389

The Company determined the fair value of the share consideration and contingent consideration in cash and ordinary shares with the assistance of an independent third party valuation firm.

Details of the purchase consideration are as follows:

(i)

RMB15,500 and RMB2,000 of the above cash consideration were paid in April and December 2013, respectively.

(ii)

Share consideration represents a payment of RMB10,455 equivalent ADS shares was subsequently settled in May 2013. This share consideration was classified as a liability initially measured at its estimated fair value on the acquisition date and was reclassified to additional paid in capital when the number of shares to be issued became fixed.

(iii)

The contingent consideration in both cash and shares are determined based on the achievement by Tianwang and Yilong of certain financial targets in accordance with the sales and purchase agreement for the fiscal years 2013 and 2014 as well as compliance to the terms of the sales and purchase agreement. The above contingent consideration amounts were derived from the Company’s assessment of whether Tianwang and Yilong would meet the contractually stipulated targets. The outstanding contingent consideration related to year 2014 has been recorded in the “Amount due to related parties” balance within the Company’s statement of financial position (Note 24).

(iv)

As the contingent consideration in shares is not considered to be indexed to its own shares since the settlement amount is determined based on the agreed targets, it is liability-classified and is remeasured at the end of each reporting period with an adjustment for fair value recorded to the current period expense. As the contingency with respect to the financial targets for fiscal year 2013 was resolved, the corresponding portion of the contingent consideration was remeasured on December 31, 2013 and December 31, 2014, with its fair value of RMB10,082 and RMB15,960 (US$2,572) reclassified to additional paid in capital. As the contingency with respect to the financial targets for fiscal year 2014 was resolved, the corresponding portion of the contingent consideration was remeasured on December 31, 2014, with its fair value of RMB7,762 (US$1,251) reclassified to additional paid in capital.

iJoy

As a part of the Company’s business expansion strategy into the provision of content delivery network (“CDN”) services, the Company acquired 100% equity interests in iJoy on April 30, 2013 for a total purchase consideration of RMB96,957 (net of the pre-existing receivables and payables which is settled between the Company and iJoy on the acquisition date) as follows:


	RMB
Cash consideration (i)		24,663
Contingent consideration in cash * (ii)		25,146
Contingent ordinary shares issuance * (ii) (iii)		47,148

Total fair value of purchase price consideration		96,957

The Company determined the fair value of the contingent consideration in cash and ordinary shares with the assistance of an independent third party valuation firm.

Details of the purchase consideration are as follows:

(i)

The Company has paid the first cash payment of approximately RMB24,883 to the seller of iJoy in 2013. The remaining balance of contingent consideration in cash of approximately RMB25,146 is to be paid when certain post-closing conditions are met.

(ii)

The contingent considerations are determined based on the achievement by iJoy of certain financial targets in accordance with the sales and purchase agreement for the fiscal years 2013, 2014 and 2015 as well as meeting certain operational milestones provided in the terms of the sales and purchase agreement. The above contingent consideration amounts were derived from the Company’s assessment of whether iJoy will meet the contractually stipulated targets. The outstanding contingent consideration related to fiscal 2015 has been recorded in the “Amount due to related parties” balance within the Company’s Consolidated Balance Sheets (Note 24).

(iii)

21V Xi’an

On July 2, 2012, the Company through its wholly-owned subsidiary, 21Vianet HK, purchased 21ViaNet@Xian Holding Limited and its subsidiary (collectively, “21V Xi’an”) from 21 Vianet Infrastructure Limited, a subsidiary of aBitCool Inc.(“aBitCool”), a related party, for an aggregate cash consideration of RMB15,977, which is net of the pre-existing receivables and payables which were settled between the Company and 21V Xi’an upon acquisition. 21V Xi’an had previously sold cabinets and leased data center space to the Company. The acquisition of 21V Xi’an has been entered into with the intention to expand the Company’s self-built data center and increase the number of cabinets, so that the Company can effectively manage market demand and improve profit margins. The bargain purchase gain of RMB10,539 represented the excess of the fair value of the identifiable net assets acquired above the consideration transferred. Specifically, the bargain purchase gain relates to the excess of the fair value of the property and equipment over the carrying amount of these assets, which was used to determine the original purchase consideration. The resulting bargain purchase gain has been recorded in other income in the Company’s consolidated statement of operations for the year ended December 31, 2012.

Fastweb

On September 9, 2012, as part of the Company’s business expansion strategy into CDN services, the Company acquired 100% equity interests in Fastweb for a total purchase consideration of RMB116,040. The contingent share consideration is determined based on the achievement by Fastweb of certain financial targets in accordance with the sales and purchase agreement for the fiscal years 2012 and 2013 as well as compliance to the terms of the sales and purchase agreement. The Company determined the fair value of the contingent share consideration with the assistance of an independent third party valuation firm.

Gehua

On October 19, 2011, as a part of the Company’s business expansion strategy into the provision of managed network services that are complementary to its core IDC business, the Company through 21Vianet Beijing, acquired 100% equity interest in Gehua from a related party for a total purchase consideration of RMB77,469.

The contingent consideration in shares is determined based on the achievement by Gehua of certain financial targets in accordance with the sales and purchase agreement for the periods from September 1, 2011 to December 31, 2011, from September 1, 2011 to August 31, 2013 and the operating effectiveness of the fiber optic lease arrangement acquired as part of this acquisition for the period up to August 15, 2014

As the contingency with respect to the financial targets for the period from September 1, 2011 to August 31, 2013 and the operating effectiveness of the fiber optic lease arrangement had been resolved, the corresponding portion of the contingent consideration in shares were remeasured on December 31, 2013 and August 15, 2014, respectively, with their then fair values of RMB38,665 and RMB21,482 (US$3,462) reclassified to additional paid in capital.

Accounts and Notes Receivable, Net

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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+ Details

Accounts and Notes Receivable, Net

12 Months Ended

Dec. 31, 2014

Receivables [Abstract]

5.	ACCOUNTS AND NOTES RECEIVABLE, NET

Accounts and notes receivable and the allowance for doubtful accounts consist of the following:


	December 31,
	2013			2014
	RMB			RMB			US$
Accounts receivable		610,960			749,456			120,790
Notes receivable		—			905			146

Allowance for doubtful debts		(547	)		(10,416	)		(1,678	)

		610,413			739,945			119,258

As of December 31, 2013 and 2014, all accounts and notes receivable were due from third party customers.

An analysis of the allowance for doubtful accounts is as follows:


	December 31,
	2013			2014
	RMB			RMB			US$
Balance at beginning of the year		341			547			88
Provision		502			9,924			1,599
Write-off of accounts receivable		(296	)		(55	)		(9	)

Balance at the end of the year		547			10,416			1,678

Additions to the Company’s allowance for doubtful accounts were recorded within general and administrative expenses for the years ended December 31, 2012, 2013 and 2014.

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

Short-Term Investments

12 Months Ended

Dec. 31, 2014

Short-Term Investments

6.	SHORT-TERM INVESTMENTS

Short-term investments consisted of the following as of December 31, 2013 and 2014:


	December 31,
	2013		2014
	RMB		RMB		US$
Held-to-maturity securities
- Fixed rate time deposits		127,023		11,242		1,812
- Floating rate time deposits		74,803		—		—
- Floating rate principal guaranteed investments		900,000		—		—
- Fixed rate principal guaranteed investments		—		900,000		145,054

		1,101,826		911,242		146,866

The Company recorded interest income related to its short-term investments amounting to RMB12,708, RMB35,649 and RMB50,882 (US$8,405) for the years ended December 31, 2012, 2013 and 2014, respectively, in the consolidated statements of operations. There were no unrealized gains or losses as of December 31, 2012, 2013 and 2014.

Inventories

12 Months Ended

Dec. 31, 2014

Inventory Disclosure [Abstract]

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

7.	INVENTORIES

Inventories consisted of the following as of December 31, 2013 and 2014:

December 31,

2013

2014

RMB

US$

Broadband related products

—

10,059

1,621

Prepaid Expenses and Other Current Assets

12 Months Ended

Dec. 31, 2014

Prepaid Expenses and Other Current Assets

8.	PREPAID EXPENSES AND OTHER CURRENT ASSETS

Prepaid expenses and other current assets consist of the following:


	December 31,
	2013		2014
	RMB		RMB		US$
Prepaid expenses for bandwidth, rented data centers or cabinets		26,332		66,896		10,782
Staff field advances		3,716		8,453		1,362
Interest receivables		28,404		13,275		2,140
Receivables for the disposal of certain construction-in-progress		20,290		20,290		3,270
Loans to shareholder of BJ Yichengtaihe		24,000		—		—
Tax recoverables		21,345		66,492		10,717
Deposits		10,079		9,793		1,578
Loan to third parties		6,987		48,422		7,804
Other receivables		13,722		75,820		12,216

		154,875		309,441		49,869

Prepaid expenses for bandwidth, rented data centers and cabinets represent the unamortized portion of prepayments made to the Company’s telecommunication operators and certain technology companies, which provide the Company with access to bandwidth, data centers or cabinets.

Loans to the shareholder of BJ Yichengtaihe are offset against the purchase consideration when the assets acquisition closed on September 30, 2014 (Note 4).

Property and Equipment, Net

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Property and Equipment, Net

9.	PROPERTY AND EQUIPMENT, NET

Property and equipment, including those held under capital leases, consist of the following:


	December 31,
	2013			2014
	RMB			RMB			US$
At cost:
Property		397,389			439,480			70,831
Leasehold improvements		228,101			359,870			58,001
Computer and network equipment		960,029			2,225,419			358,672
Optical fibers		64,700			207,423			33,431
Office equipment		6,717			18,472			2,977
Motor vehicles		1,751			6,893			1,111

		1,658,687			3,257,557			525,023
Less: accumulated depreciation		(429,761	)		(706,111	)		(113,804	)

		1,228,926			2,551,446			411,219
Construction-in-progress		173,251			485,261			78,210

		1,402,177			3,036,707			489,429

Depreciation expense was RMB92,786, RMB141,286 and RMB278,986 (US$44,964) for the years ended December 31, 2012, 2013 and 2014, respectively, and were included in the following captions:


	For the year ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Cost of revenues		69,883		103,002		225,680		36,373
Sales and marketing expenses		814		2,097		3,397		575
General and administrative expenses		2,691		10,271		19,433		3,104
Research and development expenses		19,398		25,916		30,476		4,912

		92,786		141,286		278,986		44,964

The carrying amounts of the Company’s property and equipment held under capital leases at respective balance sheet dates were as follows:


	December 31,
	2013			2014
	RMB			RMB			US$
Property		365,353			365,353			58,884
Computer and network equipment		87,896			164,483			26,510
Optical fibers		64,700			207,423			33,431

		517,949			737,259			118,825
Less: accumulated depreciation		(51,935	)		(74,237	)		(11,965	)

		466,014			663,022			106,860

Depreciation of property, computer and network equipment and optical fibers under capital leases was RMB15,934, RMB18,820 and RMB22,302 (US$3,594), for the years ended December 31, 2012, 2013 and 2014, respectively.

The carrying amounts of computer and network equipment pledged by the Company to secure banking borrowings (Note 14) granted to the Company at the respective balance sheet dates were as follows:


	December 31,
	2013		2014
	RMB		RMB		US$
Property		—		22,921		3,694
Computer and network equipment		94,129		42,115		6,788

Intangible Assets, Net

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets, Net

10.

INTANGIBLE ASSETS, NET

The following table presents the Company’s intangible assets as of the respective balance sheet dates:


	Purchased software			Radio spectrum license			Network use right			Contract backlog*			Customer relationships*			Licenses*			Supplier relationships*			Trade names*			Platform software*			Non-compete agreements*			Favorable contract*			Internal use software			Property management relationship*			Total
	RMB			RMB						RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB
Intangible assets, net January 1, 2013		13,527			115,306			19,833			1,529			37,635			1,213			93,554			13,005			8,307			—			—			—			—			303,909
Additions		13,934			—			—			4,320			27,770			2,160			14,950			—			10,250			1,500			6,500			13,889			—			95,273
Disposals		(42	)		—			—			—			—			—			—			—			—			—			—			—			—			(42	)
Foreign currency translation difference		—			(3,348	)		—			—			—			—			—			—			—			—			—			—						(3,348	)
Amortization expense		(4,646	)		(7,945	)		(999	)		(4,893	)		(12,535	)		(214	)		(15,217	)		(1,020	)		(3,146	)		(250	)		(6,468	)		(1,570	)		—			(58,903	)

Intangible assets, net December 31, 2013		22,773			104,013			18,834			956			52,870			3,159			93,287			11,985			15,411			1,250			32			12,319			—			336,889
Additions		64,778			—			—			34,259			673,227			15,412			68,042			227,014			—			26,970			—			7,199			86,873			1,203,774
Disposals		(8,662	)		—			—			—			—			—			—			—			—			—			—			(1,331	)		—			(9,993	)
Foreign currency translation difference		1,025			427			—			—			—			—			—			—			—			—			—			—			—			1,452
Amortization expense		(12,882	)		(8,560	)		(1,000	)		(3,701	)		(48,666	)		(786	)		(20,325	)		(9,902	)		(3,829	)		(4,022	)		(32	)		(8,333	)		(5,631	)		(127,669	)

Intangible assets, net December 31, 2014		67,032			95,880			17,834			31,514			677,431			17,785			141,004			229,097			11,582			24,198			—			9,854			81,242			1,404,453

Intangible assets, net December 31, 2014 (US$)		10,803			15,453			2,874			5,079			109,182			2,866			22,726			36,924			1,867			3,900			—			1,588			13,095			226,357

*	Acquired in the acquisitions of subsidiaries

Contract backlog relate to the order placed by the customers that have yet to be delivered at the acquisition date. Customer relationships relate to the relationships that arose as a result of existing customer agreements acquired and is derived from the estimated net cash flows that are expected to be derived from the expected renewal of these existing customer agreements after subtracting the estimated net cash flows from other contributory assets. Licenses represented the telecommunication service license in relation to managed network services and virtual private network services. Supplier relationships relate to the relationships that arose as a result of existing bandwidth supply agreements with certain network operators. Except for the supplier relationship in the acquisition of Fastweb and virtual private network supplier relationship in the acquisition of Tianwang and Yilong and Dermot Entities which were valued using a replacement cost method given the relative ease of replacement, the values of supplier relationships were generally derived from the estimated net cash flows that are expected to be generated from the expected renewal of these existing supplier agreements after subtracting the estimated net cash flows from other contributory assets. Trade Names relate to the trade names of SH Guotong, the Managed Network Entities, Aipu Group and Dermot Entities. Non-compete agreements represented the agreements signed with key managements of acquirees at the acquisition date, which was mainly in relation to the acquisitions of Aipu Group, valued using the incremental cash flow method. Property management relationship relate to the community relationships that in the acquisition of Aipu Group which was valued using the replacement cost method.

The intangible assets, except for acquired customer relationships in the acquisition of the Managed Network Entities which are amortized using an accelerated method of amortization, are amortized using the straight-line method, which is the Company’s best estimate of how these assets will be economically consumed over their respective estimated useful lives ranging from 1 to 20 years.

Amortization expenses were approximately RMB35,377, RMB58,903 and RMB127,669 (US$20,577) for the years ended December 31, 2012, 2013 and 2014, respectively.

The annual estimated amortization expenses for the intangible assets for each of the next five years are as follows:


	RMB		US$
2015		189,106		30,478
2016		171,481		27,638
2017		165,854		26,731
2018		149,625		24,115
2019		139,653		22,508

		815,719		131,470

Land Use Rights

12 Months Ended

Dec. 31, 2014

Text Block [Abstract]

Land Use Rights

11.

LAND USE RIGHTS

Land use rights held by the Company are amortized over the remaining term of the respective land use rights certificates.


	December 31,
	2013		2014			2014
	RMB		RMB			US$
Cost		—		66,878			10,778
Accumulated amortization		—		(703	)		(113	)

Land use rights, net		—		66,175			10,665

Goodwill

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

12.

GOODWILL

The changes in the carrying amount of goodwill were as follows:


	December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Balance as of January 1		217,436		296,688		410,500		66,161
Goodwill acquired		79,252		113,812		1,345,470		216,850

Balance as of December 31		296,688		410,500		1,755,970		283,011

No impairment charge was recorded in any of the three years ended December 31, 2014.

Long-Term Investments

12 Months Ended

Dec. 31, 2014

Bank and Other Borrowings

Long-Term Investments

13.

LONG-TERM INVESTMENTS

The Company’s long-term investments comprise of the following:

Cost method investment

The carrying amount of Company’s cost method investments was RMB8,200 and RMB28,451 (US$4,585) as of December 31, 2013 and 2014, respectively. In 2014, the Company made additional investments in certain network entities, without significant influence.

There were no indicators of impairment noted for these long-term investments as of December 31, 2014.

Investment in an equity investee

As of December 31, 2012

Increase (decrease)
during the year ended
December 31, 2013

As of December 31, 2013

Cost of
investment

Share
equity loss

Investment
in equity
investee

Cost of
investment

Share
equity loss

Cost of
investment

Share
equity loss

Investment
in equity
investee

RMB

Yizhuang Fund

50,500

(1,101

)

49,399

50,500

(1,372

)

101,000

(2,473

)

98,527

As of December 31, 2013

Increase (decrease)
during the year ended
December 31, 2014

As of December 31, 2014

Cost of
investment

Share
equity loss

Investment
in equity
investee

Cost of
investment

Share
equity loss

Cost of
investment

Share
equity loss

Investment
in equity
investee

RMB

US$

Yizhuang Fund

101,000

(2,473

)

98,527

—

(671

)

101,000

(3,144

)

97,856

15,772

In April 2012, the Company through its subsidiary, 21Vianet Beijing, entered into an agreement to invest in the Yizhuang Venture Investment Fund (“Yizhuang Fund”) as a limited partner. In December 2013, the Company made the second tranche of investment of an amount of RMB50,500 in the Yizhuang Fund, and held 27.694% of the investee as of December 31, 2013 and December 31, 2014. Given the Company holds more than three percent interest in the Yizhuang Fund as a limited partner, the investment is accounted for under the equity method as prescribed in ASC323-10, Investments — Equity Method.

There were no indicators of impairment noted for this long-term investment as of December 31, 2014.

Bonds Payable

12 Months Ended

Dec. 31, 2014

Bonds 7.875% Due 2016

Bonds Payable

17.

BONDS PAYABLE

On March 22, 2013, the Company issued and sold bonds with an aggregate principal amount of RMB1,000,000 at a coupon rate of 7.875% per annum (the “2016 Bonds”). The 2016 Bonds will mature on March 22, 2016. The 2016 Bonds were listed and quoted on the Official List of the Singapore Exchange Securities Trading Limited. Interest on the 2016 Bonds is payable semi-annually in arrears on March 22 and September 22 in each year, beginning September 22, 2013. The net proceeds from the 2016 Bonds, after deducting issuance costs of RMB25,189 and a discount of RMB1,970, were RMB972,841, which will be used for construction of new data centers and other general corporate purposes. The effective interest rate of the 2016 Bonds is 9.29%. On June 30, 2014, the Company repurchased 73.57% of the outstanding 2016 Bonds with the total consideration of RMB776,163 (US$125,095) including payment of accrued interests of RMB15,556 (US$2,507). The debt extinguishment loss amounting to RMB41,581 (US$6,702) was recognized in earnings upon the repurchase.

On June 26, 2014, the Company issued and sold bonds with an aggregate principal amount of RMB2,000,000 (equivalent to US$322,341) at a coupon rate of 6.875% per annum (the “2017 Bonds”). The 2017 Bonds will mature on June 26, 2017. The 2017 Bonds were listed and quoted on the Official List of the Singapore Exchange Securities Trading Limited. Interest on the 2017 Bonds is payable semi-annually in arrears on June 26 and December 26 in each year, beginning December 26, 2014. Net proceeds from the 2017 Bonds after deducting issuance costs of RMB19,360 (US$3,120), were RMB1,980,640 (US$319,221). The proceeds from issuance of 2017 Bonds was used to new data centers, fund acquisitions, repurchase the 2016 Bonds and for general corporate purposes. The effective interest rate of the 2017 Bonds is 7.39%.

Deferred issuance costs are included in “Other non-current assets” in the Company’s consolidated balance sheets. The deferred issuance costs are amortized as interest expense using the effective interest method over the term of the 2016 Bonds and the 2017 Bonds, respectively.

Both the 2016 Bonds and the 2017 Bonds are unsecured and rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated to the bonds; equal in right of payment to any of the Company’s liabilities that are not so subordinated; but rank lower than any secured indebtedness of the Company and all liabilities (including accounts payable) of the Company’s subsidiaries and Consolidated VIEs.

The following table summarizes the aggregate required repayments of the principal amounts of the Company’s long-term borrowings, including the bonds payable, bank and other borrowings (Note 14), in the succeeding five years and thereafter:


	RMB		US$
For the years ending December 31,
2015		1,055,648		170,139
2016		280,554		45,217
2017		2,016,628		325,021
2018		18,976		3,058
2019		9,814		1,582
Thereafter		—		—

Bonds Payable

14.

BANK AND OTHER BORROWINGS

Bank and other borrowings are as follows as of the respective balance sheet dates:


	December 31,
	2013		2014		2014
	(RMB)		(RMB)		(US$)
Short-term bank borrowings		173,726		160,181		25,816
Long-term bank borrowings, current portion		197,000		55,647		8,968
Other long-term borrowings, current portion		—		900,000		145,054

		370,726		1,115,828		179,838

Long-term bank borrowings, non-current portion		65,740		61,673		9,940
Other long-term borrowings, non-current portion		900,000		—		—

		965,740		61,673		9,940

Total bank and other borrowings		1,336,466		1,177,501		189,779

The short-term bank borrowings outstanding as of December 31, 2013 and 2014 bore a weighted average interest rate of 7.00% and 6.36% per annum, respectively, and were denominated in RMB. These borrowings were obtained from financial institutions and have terms of two months to one year. The long-term bank borrowings (including current portion) outstanding as of December 31, 2013 and 2014 bore a weighted average interest rate of 7.12% and 6.00% per annum, and were denominated in RMB and HK$. These loans were obtained from financial institutions located in the PRC.

In 2013, the Company established Asia Cloud Investment with the funds provided through two entrusted loans. The two entrusted loans have an aggregate principal amount of RMB900,000 with an interest rate of 4% per annum, and maturity dates of August 28 and September 10, 2015, respectively (Note 1(c)).

As of December 31, 2013 and December 31, 2014, unused loan facilities for bank and other borrowings amounted to RMB77,243 and RMB169,954 (US$27,392), respectively.

Bank and other borrowings as of December 31, 2013 and 2014 were secured/guaranteed by the following:

December 31, 2013


Short-term bank borrowings		Secured/guaranteed by
(RMB)
	19,085	Guaranteed by restricted cash of RMB2,099.
	30,000	Secured by a subsidiary’s computer and network equipment with net book value of RMB46,631 (Note 9).
	40,000	Jointly guaranteed by Mr. Chen Sheng, Director and CEO of the Company and Mr. Zhang Jun, the former Director and COO of the Company.
	84,641	Unsecured borrowings.

	173,726


Long-term bank and other borrowings (including current portion)		Secured/guaranteed by
(RMB)
	19,740	Jointly guaranteed by the Company’s computer and network equipment with net book value of RMB47,498 (Note 9).
	63,000	Guaranteed by restricted cash of RMB100,000.
	180,000	Guaranteed by restricted cash of RMB190,000.
	900,000	Secured by the pledged dividend right and the right to sell or transfer the 90% equity interest of Asia Cloud Investment held by 21Vianet Technology (Note 1(c)).

	1,162,740

December 31, 2014


Short-term bank borrowings		Secured/guaranteed by
(RMB)
	9,181	Guaranteed by restricted cash of RMB1,885.
	11,000	Secured by a subsidiary’s building with net book value of RMB14,298 (Note 9).
	140,000	Unsecured borrowings.

	160,181


Long-term bank and other borrowings (including current portion)		Secured/guaranteed by
(RMB)
	2,090	Jointly guaranteed by (i) the ultimate controlling shareholder of Dermot Entities and Upwise Investments Limited, the seller of Dermot Entities; (ii) restricted cash of HK$1,500.
	8,000	Secured by a subsidiary’s building with net book value of RMB8,623 (Note 9).
	18,753	Secured by a subsidiary’s computer and network equipment with net book value of RMB42,115 (Note 9).
	50,000	Guaranteed by restricted cash of RMB100,000.
	900,000	Secured by the pledged dividend right and the right to sell or transfer the 90% equity interest of Asia Cloud Investment held by 21Vianet Technology (Note 1(c)).
	38,477	Unsecured borrowings.

	1,017,320

Accrued Expenses And Other Payables

12 Months Ended

Dec. 31, 2014

Payables and Accruals [Abstract]

Accrued Expenses And Other Payables

15.

ACCRUED EXPENSES AND OTHER PAYABLES

The components of accrued expenses and other payables are as follows:


	December 31,
	2013		2014
	RMB		RMB		US$
Payroll and welfare payables		28,693		178,295		28,736
Business and other taxes payable		67,408		16,633		2,681
Payables for office supplies and utilities		3,650		8,782		1,415
Payables for the purchase of property and equipment		85,993		233,353		37,610
Payable for purchase intangible assets		10,000		5,054		815
Accrued service fees		37,130		60,167		9,697
Interest payables		36,254		20,452		3,296
Share-settled bonuses		6,441		14,913		2,404
Payable for assets acquisition		—		35,846		5,777
Others		16,852		25,996		4,189

		292,421		599,491		96,620

Capital Leases

12 Months Ended

Dec. 31, 2014

Leases [Abstract]

Capital Leases

16.

CAPITAL LEASES

Certain property, computer and network equipment and optical fibers were acquired through capital leases entered into by the Company.

Future minimum lease payments under non-cancellable capital lease arrangements as lessee are as follows:


	RMB			US$
2015		120,919			19,489
2016		93,107			15,006
2017		117,797			18,985
2018		81,498			13,135
2019 and thereafter		782,823			126,168

Total minimum lease payments		1,196,144			192,783
Less: amount representing interest		(612,526	)		(98,721	)

Present value of remaining minimum lease payments		583,618			94,062

Capital leases had weighted average interest rates of 11.88% and 11.41% for the years ended December 31, 2013 and 2014, respectively.

Deferred Government Grants

12 Months Ended

Dec. 31, 2014

Deferred Revenue Disclosure [Abstract]

Deferred Government Grants

18.

DEFERRED GOVERNMENT GRANTS

During the years ended December 31, 2012, 2013 and 2014, the Company received RMB15,850, RMB2,950 and RMB20,920 (US$3,372), respectively, in government grants from the relevant PRC government authorities. The government grants received during the year ended December 31, 2012, 2013 and 2014 are required to be used in construction of property and equipment. These grants are initially deferred and subsequently recognized in the statement of operations when the Company has complied with the conditions or performance obligations attached to the related government grants, if any, and the grants are no longer refundable. Grants that subsidize the construction cost of property and equipment are amortized over the life of the related assets as a reduction of the associated depreciation expense.

Movements of deferred government grants are as follows:


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Balance at beginning of the year		5,819			18,793			18,046			2,908
Additions		15,850			2,950			20,920			3,372
Recognized in income as a reduction of depreciation expense		(2,876	)		(3,697	)		(5,394	)		(869	)

Balance at end of the year		18,793			18,046			33,572			5,411

Treasury Stock

12 Months Ended

Dec. 31, 2014

Treasury Stock

19.

TREASURY STOCK

For the year ended December 31, 2012, 2013 and 2014, the Company repurchased the number of 447,828 ADSs, 586,869 ADSs and 1,553,085 ADSs pursuant to the share repurchase plans. The repurchased ordinary shares were mainly used for settlement of acquisition payment.

For the year ended December 31, 2012, 2013 and 2014, 2,343,239 ADSs, 840,114 ADSs and nil were issued to settle the contingent consideration payment in relation to acquisitions.

In 2014, 76,048 ADSs were issued to Galaxy ENet Inc. (“Galaxy ENet”) (Note 22(b)).

Accumulated Other Comprehensive Loss

12 Months Ended

Dec. 31, 2014

Accumulated Other Comprehensive Loss

20.

ACCUMULATED OTHER COMPREHENSIVE LOSS

The changes in accumulated other comprehensive income (loss) by component, net of tax of nil, are as follows:


	Foreign currency translation			Total
	RMB			RMB
Balance as of January 1, 2012		(54,779	)		(54,779	)
Current year other comprehensive loss		(2,588	)		(2,588	)

Balance as of December 31, 2012		(57,367	)		(57,367	)
Current year other comprehensive loss		(25,222	)		(25,222	)

Balance as of December 31, 2013		(82,589	)		(82,589	)
Current year other comprehensive income		16,835			16,835

Balance as of December 31, 2014		(65,754	)		(65,754	)

Balance as of December 31, 2014, in US$		(10,598	)		(10,598	)

Mainland China Employee Contribution Plan

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e689-108580

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669619-108580

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e640-108580

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e716-108580

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e709-108580

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Reclassification Adjustments
-URI http://asc.fasb.org/extlink&oid=6522872

+ Details

Mainland China Employee Contribution Plan

12 Months Ended

Dec. 31, 2014

Text Block [Abstract]

21.

MAINLAND CHINA EMPLOYEE CONTRIBUTION PLAN

As stipulated by the regulations of the PRC, full-time employees of the Company in the PRC participate in a government-mandated multiemployer defined contribution plan organized by municipal and provincial governments. Under the plan, certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees. The Company is required to make contributions to the plan based on certain percentages of employees’ salaries. The total expenses for the plan were RMB29,015, RMB45,934 and RMB88,102 (US$14,553), respectively, for the years ended December 31, 2012, 2013 and 2014.

Share Based Compensation

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share Based Compensation

22.

SHARE BASED COMPENSATION

(a)

Option granted to employees

In order to provide additional incentives to employees and to promote the success of the Company’s business, the Company adopted a share incentive plan in 2010 (the “2010 Plan”) and 2014 (the “2014 Plan”), respectively. Under the 2010 Plan, the Company may grant options and RSUs to its employees, directors and consultants to purchase an aggregate of no more than 39,272,595 ordinary shares of the Company. The 2010 Plan was approved by the Board of Directors and shareholders of the Company on July 16, 2010. The 2010 Plan is administered by the Board of Directors or the Compensation Committee of the Board as set forth in the 2010 Plan (the “Plan Administrator”). All share options to be granted under the 2010 Plan have a contractual term of ten years and generally vest over 3 to 4 years in the grantee’s option agreement.

In order to further promote the success and enhance the value, the Company adopted the 2014 Plan. The 2014 Plan was approved by Annual General Meeting on May 29, 2014. Under the 2014 Plan, the Company may issue an aggregate of no more than 20,461,380 shares (“Maximum Number”) and such Maximum Number should be automatically increased by a number that is equal to 15% of the number of new shares issued by the Company from time to time. All share options, restricted shares and restricted share units to be granted under the 2014 Plan have a contractual term of ten years and generally vest over 3 to 4 years in the grantee’s option agreement.

The Company granted 2,524,932 share options and 432,910 RSUs in 2012, 676,592 RSUs and 3,122,417 RSUs in 2013 and 2014, respectively, with performance conditions whereby a predetermined number will vest upon the assignment of an annual performance review rating in accordance with predetermined performance targets for the grantees over a one or four-year period. As it is probable for the Company to estimate the annual performance review ratings for the individual grantees, the Company commenced recognition of the related compensation expense using the accelerated recognition method.

The compensation cost related to remaining unvested share options shall be recognized over the remaining requisite service period or the performance review period. As of December 31, 2014, options to purchase 9,054,118 of ordinary shares were outstanding.

The following table summarized the Company’s employee share option activity under the 2010 Plan:


	Number of options			Weighted average exercise price		Weighted average remaining contractual term		Aggregate intrinsic value
				(US$)		(Years)		(US$)
Outstanding, January 1, 2014		10,958,796			0.31		6.7		39,546
Exercised		(1,828,910	)		0.26
Forfeited		(75,768	)		0.54

Outstanding, December 31, 2014		9,054,118			0.32		6.3		20,450

Vested and expected to vest at December 31, 2014		9,054,118			0.32		6.3		20,450

Exercisable as of December 31, 2014		7,837,941			0.25		6.2		18,225

The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying awards and the fair value of the underlying stock at each reporting date, for those awards that have an exercise price below the estimated fair value of the Company’s shares. As of December 31, 2013 and 2014, the Company had options outstanding to purchase an aggregate of 10,958,796 shares and 9,054,118 shares with an exercise price below the fair value of the Company’s shares, resulting in an aggregate intrinsic value of RMB239,400 and RMB126,884 (US$20,450), respectively.

For share options granted before September 30, 2011, the fair value of each share option grant was estimated on the date of grant using the Black-Scholes option pricing model. For share options granted after September 30, 2011, the fair value of each award is estimated on the date of grant using a binomial-lattice option valuation model. The binomial-lattice model considers characteristics of fair value option pricing that are not available under the Black-Scholes. Similar to the Black-Scholes model, the binomial-lattice model takes into account variables such as volatility, dividend yield, and risk-free interest rate. However, in addition, the binomial-lattice model considers the contractual term of the option, the probability that the option will be exercised prior to the end of its contractual life, and the probability of termination or retirement of the option holder in computing the value of the option. For these reasons, the Company believes that the binomial-lattice model provides a fair value for its share based compensation plans that are more representative of actual experience and future expected experience that the value calculated in previous years using the Black-Scholes model.

The Company calculated the estimated fair value of the share options on the grant date using the Black-Scholes Option model or Binomial-Lattice model for 2011 and 2012, respectively, with the following assumptions:


	Granted in 2011	Granted in 2011	Granted in 2012
	Before September 30, 2011	After September 30, 2011
Risk-free interest rates	1.03%-3.36%	1.03%-3.36%	2.06%-3.68%
Expected life (years)	0.08-7.75 years	Not applicable	Not applicable
Sub optimal early exercise factor	Not applicable	2.2	2.2
Expected volatility	24.25%-76%	69.17%	57.01%-68.03%
Expected dividend yield	0%	0%	0%
Fair value of share option	US$1.20-US$2.06	US$1.02-US$1.03	US$1.34-US$1.68

The aggregate fair value of the outstanding options at the grant date was determined to be RMB63,356 (US$ 10,211) as of December 31, 2014 and such amount is recognized as compensation expense using the straight-line method for all employee share options granted with graded vesting based on service conditions and the accelerated method for share options granted with graded vesting based on performance conditions. The weighted-average grant-date fair value of options granted during the years ended December 31, 2012, 2013 and 2014 was US$1.49, nil and nil respectively. The total fair value of share options vested during the years ended December 31, 2012, 2013 and 2014 was US$5,655, US$3,388 and US$5,488, respectively. The aggregate intrinsic value of options exercised during the years ended December 31, 2012, 2013 and 2014 was US$4,487, US$24,355, and US$15,517, respectively.

As of December 31, 2014, there was RMB3,104 (US$500) of unrecognized share-based compensation cost, net of estimated forfeitures, related to unvested options which is expected to be recognized over a weighted-average period of 0.3 year. Total unrecognized compensation cost may be adjusted for future changes in estimated forfeitures.

The following table summarizes the Company’s RSUs activity under the 2010 Plan and 2014 Plan:


	Number of RSUs			Weighted-average grant date fair value		Weighted-average remaining contractual life		Aggregate intrinsic value
				(US$)		(Years)		(US$)
Unvested, January 1, 2014		1,176,611			12.52		9.0		27,674
Granted		3,196,373			23.27
Vested		(677,570	)		14.42
Forfeited		(85,158	)		12.56

Unvested, December 31, 2014		3,610,256			19.22		8.6		55,851

Share-based compensation cost for RSUs is measured based on the closing fair market value of the Company’s ADS on the date of grant and the reporting date for equity and liability classified RSUs, respectively. The aggregate fair value of the unvested RSUs as of December 31, 2014 was RMB346,533 (US$55,851), and such amount is recognized as compensation expense using the straight-line method for the RSUs with graded vesting based on service conditions and the accelerated method for the RSUs with graded vesting based on performance conditions and share-settled bonuses. The weighted-average grant-date fair value of RSUs granted during the years ended December 31, 2012, 2013 and 2014 was US$10.01, US$14.22 and US$20.39, respectively. The total fair value of RSUs vested during the years ended December 31, 2012, 2013 and 2014 was US$1,184, US$2,898 and US$9,774, respectively.

During 2014, the Company granted 73,956 RSUs to settle the performance bonuses as elected by employees. As of December 31, 2014, there was RMB366,245 (US$59,028) of unrecognized share-based compensation cost related to RSUs which is expected to be recognized over a weighted-average vesting period of 2.5 years. Total unrecognized compensation cost may be adjusted for future changes in estimated forfeitures.

(b)

Fully vested ordinary shares to employees

On March 5, 2014, the Company agreed to issue 690,000 fully vested ADSs to Galaxy ENet, a company owned by a certain management employee of the Managed Network Entities. These ADSs are to compensate certain management employees of the Managed Network Entities in exchange for their past services and all of them have transferred their rights to Galaxy ENet. Such fully vested ADSs were issued to Galaxy ENet with treasury stock of 76,048 ADSs and newly issued share of 613,952 ADSs. Accordingly, the Company recorded share-based compensation cost of RMB117,207 (US$18,890) in “General and administrative expenses” within the Company’s consolidated statements of operations.

(c)

Shares issued to management of Dermot Entities (Note 4)

For the year ended December 31, 2014, the Company recorded compensation cost of RMB4,022 (US$649) within the Company’s consolidated statements of operations.

Total compensation expense relating to share options and RSUs granted to employees recognized for the years ended December 31, 2012, 2013 and 2014 is as follows:


	For the year ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Cost of revenues		4,517		8,054		7,163		1,154
Sales and marketing expenses		10,508		13,405		13,482		2,173
General and administrative expenses		47,749		40,711		208,914		33,671
Research and development expenses		4,858		5,599		4,176		673

		67,632		67,769		233,735		37,671

Taxation

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Taxation

23.

TAXATION

Enterprise income tax (“EIT”)

The Company is incorporated in the Cayman Islands and conducts its primary business operations through the subsidiaries and VIEs in the PRC and Hong Kong. It also has intermediate holding companies in BVI. Under the current laws of the Cayman Islands, the Company is not subject to tax on income or capital gains.

Hong Kong

Subsidiaries in Hong Kong are subject to Hong Kong profits tax rate of 16.5% for the years ended December 31, 2012, 2013 and 2014. No provision for Hong Kong profits tax has been made in the consolidated financial statements as these entities had no assessable profits in the years ended December 31, 2012, 2013 and 2014, except for DYX which was newly acquired in 2014 and has profits since acquisition.

Taiwan

DYX Taiwan branch is incorporated in Taiwan and is subject to Taiwan profits tax rate of 17% for the year ended December 31, 2014.

The PRC

The Company’s PRC subsidiaries are incorporated in the PRC and subject to PRC EIT on the taxable income in accordance with the relevant PRC income tax laws.

Effective January 1, 2008, the statutory corporate income tax rate is 25%, except for certain entities eligible for preferential tax rates.

21Vianet Beijing was qualified for a High and New Technology Enterprises (“HNTE”) since 2008 and is eligible for a 15% preferential tax rate. In October 2014, the Company obtained a new certificate, which will expire on December 31, 2016. In accordance with the PRC Income Tax Laws, an enterprise awarded with the HNTE status may enjoy a reduced EIT rate of 15%. For the years ended December 31, 2012, 2013 and 2014, 21Vianet Beijing applied a preferential tax rate of 15%.

In April 2011, 21Vianet (Xi’an) Information Outsourcing Industry Park Services Co., Ltd (“Xi’an Sub”), a subsidiary located in Shaanxi Province, qualified for a preferential tax rate of 15%. The preferential tax rate is awarded for companies that have operations in certain industries and meet the criteria of the Preferential Tax Policies for Development of the West Regions. The entity’s qualification will need to be assessed on an annual basis. For the years ended December 31, 2012, 2013 and 2014, Xi’an Sub applied a preferential tax rate of 15%.

In July 2012, Gehua, a subsidiary located in Guangdong Province, qualified as a HNTE and is eligible for a 15% preferential tax rate effective from 2012 to 2014, and thereafter for an additional 3 years if it is able to satisfy the HNTE technical and administrative requirements in those 3 years.

In June 2009, BJ Fastweb, a subsidiary located in Beijing, qualified as a HNTE and is eligible for a 15% preferential tax rate effective from 2009 to 2011, and thereafter for an additional 3 years if it is able to meet the HNTE technical and administrative requirements in those 3 years. The Company’s HNTE certificate expired as of December 31, 2011 and the Company obtained a renewed certificate in May 2012, which expired on December 31, 2014. For the years ended December 31, 2012, 2013 and 2014, BJ Fastweb applied a preferential tax rate of 15%.

In 2013, BJ iJoy qualified as a software enterprise which allows the Company to utilize a two-year 100% exemption for 2013 and 2014 followed by a three-year half-reduced EIT rate effective for the years from 2015 to 2017. For the year ended December 31, 2013 and 2014, BJ iJoy enjoyed the 100% tax exemption for its taxable income.

In 2010, GD Tianying, a subsidiary located in Guangdong Province, qualified as a HNTE and is eligible for a 15% preferential tax rate effective from 2010 to 2012, and thereafter for an addition 3 years if it is able to meet the HNTE technical and administrative requirements in those 3 years. The company’s HNTE certificate expired as of December 31, 2012 and the Company obtained a renewed certificate in October 2013, which will expire on December 31, 2015. For the year ended December 31, 2014, GD Tianying applied a preferential tax rate of 15%.

In 2000 and 2012, SC Aipu and Yunnan Aipu Network Technology Co., Ltd. (“YN Aipu”), respectively, qualified for a preferential tax rate of 15%. The preferential tax rate is awarded for companies that have operations in certain industries and meet the criteria of the Preferential Tax Policies for Development of the West Regions. The qualification will need to be reviewed on an annual basis. For the year ended December 31, 2014, SC Aipu and YN Aipu applied a preferential tax rate of 15%.

The Company’s other PRC subsidiaries were subject to EIT at a rate of 25% for the years ended December 31, 2012, 2013 and 2014.

The New EIT Law also provides that enterprises established under the laws of foreign countries or regions and whose “place of effective management” is located within the PRC are considered PRC tax resident enterprises and subject to PRC income tax at the rate of 25% on worldwide income. The definition of “place of effective management” refers to an establishment that exercises, in substance, overall management and control over the production and business, personnel, accounting, properties, etc. of an enterprise. As of December 31, 2014, no detailed interpretation or guidance has been issued to define “place of effective management”. Furthermore, as of December 31, 2014, the administrative practice associated with interpreting and applying the concept of “place of effective management” is unclear. If the Company is deemed as a PRC tax resident, it would be subject to PRC tax under the New CIT Law. The Company will continue to monitor changes in the interpretation or guidance of this law.

Profit (loss) before income taxes consists of:


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Non-PRC		(74,140	)		(165,039	)		(485,539	)		(78,255	)
PRC		167,955			128,360			173,735			28,000

		93,815			(36,679	)		(311,804	)		(50,255	)

Income tax expense comprises of:


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Current		(45,481	)		(29,905	)		(45,401	)		(7,317	)
Deferred		9,322			19,581			28,728			4,630

		(36,159	)		(10,324	)		(16,673	)		(2,687	)

The reconciliation of tax computed by applying the statutory income tax rate of 25% for the years ended December 31, 2012, 2013 and 2014 applicable to the PRC operations to income tax expense is as follows:


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Profit (loss) before income taxes		93,815			(36,679	)		(311,804	)		(50,255	)

Income tax (expense) benefit computed at applicable tax rates (25%)		(23,454	)		9,170			77,951			12,563
Non-deductible expenses		(1,969	)		(3,385	)		(6,095	)		(980	)
Research and development expenses		4,313			6,850			6,879			1,109
Effect of tax holidays		—			10,487			6,305			1,016
Preferential rate		7,245			2,655			20,049			3,231
Current and deferred tax rate differences		1,804			11,938			(8,553	)		(1,379	)
International rate differences		(15,716	)		(36,080	)		(108,066	)		(17,417	)
Tax exempted income		2,635			(905	)		2,118			341
Unrecognized tax benefits		(641	)		(6,719	)		3,872			624
Deferred tax expense		(3,695	)		(7,882	)		(3,109	)		(501	)
Change in valuation allowance		(5,263	)		1,172			(7,704	)		(1,242	)
Prior year provision to return true up		(1,418	)		2,375			(320	)		(52	)

Income tax expense		(36,159	)		(10,324	)		(16,673	)		(2,687	)

The benefit of the tax holiday per basic and diluted earnings per share is as follows:


	For the year ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Basic		—		0.029		0.016		0.003

Diluted		—		0.029		0.016		0.003

Deferred Tax

The significant components of deferred taxes are as follows:


	December 31,
	2013			2014
	RMB			RMB			US$
Deferred tax assets
Current
Allowance for doubtful accounts		147			1,523			245
Accrued salary and welfare		6,784			30,226			4,872
Accrued expenses		4,415			2,302			371
Contingent consideration payables		2,984			—			—
Property and equipment		—			1,424			229
Deferred government grant-current		153			74			12
Valuation allowance		(387	)		(547	)		(88	)

Net current deferred tax assets		14,096			35,002			5,641

Non-current
Tax losses		7,606			18,787			3,027
Property and equipment		9,947			15,428			2,487
Intangible assets		—			936			151
Capital lease		3,720			8,717			1,405
Deferred government grant-non-current		4,202			6,234			1,005
Depreciation and amortization generated from acquisitions		740			8,361			1,348
Valuation allowance		(8,346	)		(15,890	)		(2,561	)

Net non-current deferred tax assets		17,869			42,573			6,862

Total deferred tax assets		31,965			77,575			12,503

Deferred tax liabilities
Current
Accrued interest income		3,115			2,696			435

Non-current
Intangible assets		45,770			235,346			37,933
Property and equipment		28,245			69,896			11,265
Capitalized interest expense		4,578			5,098			820

Net non-current deferred tax liabilities		78,593			310,340			50,018

Total deferred tax liabilities		81,708			313,036			50,453

As of December 31, 2014, the Company has net tax operating losses from its PRC subsidiaries, as per filed tax returns, of RMB70,030 (US$11,287), which will expire between 2015 to 2019.

As of December 31, 2014, the Company intends to permanently reinvest the undistributed earnings from other foreign subsidiaries to fund future operations. As of December 31, 2014, the total amount of undistributed earnings from its PRC subsidiaries was RMB931,176 (US$150,078). The amount of unrecognized deferred tax liabilities for temporary differences related to investments in foreign subsidiaries is not determined because such a determination is not practicable.

Unrecognized Tax Benefits

As of December 31, 2013 and 2014, the Company recorded unrecognized tax benefits of RMB18,559 and RMB20,453 (US$3,296), respectively.

The unrecognized tax benefits and its related interest are primarily related to the application of a reduced income tax rate not yet approved and unqualified deemed profit tax filing method. RMB6,047 of the total unrecognized tax benefits, ultimately recognized, will impact the effective tax rate. It is possible that the amount of uncertain tax benefits will change in the next 12 months, however, an estimate of the range of the possible outcomes cannot be made at this time.

A roll-forward of unrecognized tax benefits is as follows:


	For the year ended December 31,
	2013			2014
	RMB			RMB			US$
Balance at beginning of year		10,302			14,232			2,294
Reversal based on tax positions related to prior years		(500	)		(5,948	)		(959	)
Additions based on tax positions related to the current year		4,430			8,398			1,354

Balance at end of year		14,232			16,682			2,689

In the years ended December 31, 2012, 2013 and 2014, the Company recorded (reversed) interest expense of RMB641, RMB2,289 and RMB(556) (US$(90)), respectively. Accumulated interest expense recorded by the Company was RMB4,327 and RMB3,771 (US$607) as of December 31, 2013 and 2014, respectively. As of December 31, 2014, the tax years ended December 31, 2011 through 2014 for the PRC subsidiaries remain open for statutory examination by the PRC tax authorities.

Related Party Transactions

12 Months Ended

Dec. 31, 2014

Related Party Transactions

24.

RELATED PARTY TRANSACTIONS

Related parties


Name of related parties		Relationship with the Company
aBitCool		A company owned by the same group of the Company’s Class B ordinary shareholders ⁽¹⁾
aBitCool China Limited (“ ABC”)		A company controlled by aBitCool
BitCool Media Group Limited (“Bitcool Media”)		A company controlled by aBitCool
CloudEx Beijing Science & Technology Co., Ltd. (“CE BJ”)		A company controlled by aBitCool
Beijing CloudEX Software Service Co., Ltd. (“CE Soft BJ”)		A company controlled by aBitCool
21 Vianet Infrastructure Limited ⁽³⁾		A company controlled by aBitCool
21Vianet (Xi’an) Technology Co., Ltd. (“Xi’an Tech”)⁽²⁾		A company controlled by 21 Vianet Infrastructure Limited
Shi Dai Tong Lian		Seller of the Managed Network Entities
Concept Network Limited		Seller of the Managed Network Entities
TJ Guanbang		Seller of Gehua
BJ Huibang		Seller of Gehua
Shanghai Shibei Hi-Tech Co., Ltd. (“SH Shibei”)		Noncontrolling shareholder of SH Wantong
Beijing Kaihua Kewei Technology Company Limited (“Kaihua Kewei”)		Seller of Tianwang and Yilong
A PRC citizen		Seller of iJoy
Suzhou Aizhuoyi Information Technology Co., Ltd. (“SZ Aizhuoyi”)		A company controlled by the seller of iJoy
Mr. Chen Sheng		Director and CEO of the Company
Mr. Li		Ultimate seller and noncontrolling shareholder of Aipu Group
Shantou Lishida Information Technology Co., Ltd. (“Lishida”)		Seller of Tianying
Upwise Investment Limited (“Upwise”)		Seller of Dermot Entities
Dyxnet Internet Center Limited (“DIC”)		A related party of the seller of Dermot Entities
Dyxnet Corporate Service Limited (“DCS”)		A related party of the seller of Dermot Entities

(1)

There are certain shareholders (“Common Shareholders”) that are shareholders of both aBitCool and the Company. As of December 31, 2014, in terms of economic interests and voting power, the Common Shareholders’ ownership interests in the Company were 11.36% and 54.77% while the their ownership interests in aBitCool was 90.14% in terms of both economic interests and voting power, based on the register of members of the Company. There is neither a single controlling shareholder nor a group of shareholders holding identical ownership interests individually and controlling ownership interests in aggregate in the Company and aBitCool.

(2)

Acquired by the Company on July 5, 2012.

(3)

Deregistered in 2013.

The Company had the following related party transactions for the years ended December 31, 2012, 2013 and 2014:


	For the year ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Services provided to:
- Upwise		—		—		143		23
- DCS		—		—		18		3
- CE BJ		1		—		—		—
- CE Soft BJ		215		—		—		—
Services provided by:
- DIC		—		—		4,106		662
- DCS		—		—		587		95
- Upwise		—		—		97		16
- Xi’an Tech		5,526		—		—		—
Purchases of equipment from:
- SZ Aizhuoyi		—		61,202		80,059		12,903
- DCS		—		—		330		53
- ABC		—		266		—		—
- CE Soft BJ		515		—		—		—
Loans provided to:
- Seller of Aipu Group		—		—		98,500		15,875
- BitCool Media		14,771		19,096		22,792		3,673
- SH Shibei		—		4,900		—		—
- Seller of iJoy		—		12,193		—		—
Repayment of loans:
- BitCool Media		—		1,219		35,380		5,702
Receipt of interest income from loan to:
- Bitcool Media		—		—		1,553		250
Interest income from loan to:
- Bitcool Media		253		861		956		154
Management service provided by:
- DCS		—		—		8,949		1,442
Acquisition of 21V Xi’an from 21 Vianet Infrastructure Limited		15,977		—		—		—

The Company had the following related party balances as of December 31, 2013 and 2014:


	December 31,
	2013		2014
	RMB		RMB		US$
Amounts due from related parties:
Current:
- Bitcool Media		33,311		20,126		3,244
- Seller of iJoy		24,387		24,476		3,945
- SH Shibei		9,800		9,800		1,579
- Upwise		—		465		75

		67,498		54,867		8,843

Non-current:
- Seller of Aipu Group		—		98,500		15,875

Amounts due to related parties:
Current:
- Seller of the Managed Network Entities		47,755		47,755		7,697
- Seller of iJoy		63,602		50,506		8,140
- Seller of Tianwang and Yilong		19,605		2,970		479
- Seller of GD Tianying		—		9,434		1,520
- Sellers of Dermot Entities		—		205,380		33,101
- SZ Aizhuoyi		—		7,131		1,149
- DCS		—		3,628		585
- Seller of Gehua		16,737		—		—

		147,699		326,804		52,671


	December 31,
	2013		2014
	RMB		RMB		US$
Non-current:
- Seller of iJoy		58,487		18,392		2,964
- Seller of Tianying		—		17,585		2,834
- Sellers of Aipu Group		—		67,531		10,884
- Seller of Dermot Entities		—		177,220		28,563
- Seller of Tianwang and Yilong		19,834		—		—

		78,321		280,728		45,245

All balances with the related parties, other than the amount due from BitCool Media, as of December 31, 2013 and 2014 were unsecured, interest-free and have no fixed terms of repayment. The loan provided to BitCool Media bears annual interest rates of 3% - 6% and will mature in 2015. The Company has recorded the related interest income of RMB253, RMB861 and RMB956 (US$154) using the effective interest method for the year ended December 31, 2012, 2013 and 2014, respectively.

The amount due to related parties as of December 31, 2014 mainly relate to the remaining contingent purchase consideration payable for the acquisitions of subsidiaries.

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

Earnings (Loss) Per Share

Restricted Net Assets

12 Months Ended

Dec. 31, 2014

Receivables [Abstract]

Restricted Net Assets

25.

RESTRICTED NET ASSETS

The Company’s ability to pay dividends is primarily dependent on the Company receiving distributions of funds from its subsidiaries. Relevant PRC statutory laws and regulations permit payments of dividends by the Company’s PRC subsidiaries only out of their retained earnings, if any, as determined in accordance with PRC accounting standards and regulations. The results of operations reflected in the consolidated financial statements prepared in accordance with U.S. GAAP differ from those reflected in the statutory financial statements of the Company’s PRC subsidiaries.

In accordance with the PRC Regulations on Enterprises with Foreign Investment and the articles of association of the Company’s PRC subsidiaries, a foreign-invested enterprise established in the PRC is required to provide certain statutory reserves, namely general reserve fund, the enterprise expansion fund and staff welfare and bonus fund which are appropriated from net profit as reported in the enterprise’s PRC statutory accounts. A foreign-invested enterprise is required to allocate at least 10% of its annual after-tax profit to the general reserve until such reserve has reached 50% of its respective registered capital based on the enterprise’s PRC statutory accounts. Appropriations to the enterprise expansion fund and staff welfare and bonus fund are at the discretion of the board of directors for all foreign-invested enterprises. The aforementioned reserves can only be used for specific purposes and are not distributable as cash dividends. 21Vianet China was established as foreign-invested enterprise and, therefore, is subject to the above mandated restrictions on distributable profits. As of December 31, 2013 and 2014, the Company’s PRC subsidiaries had appropriated RMB35,178 and RMB52,263 (US$8,423), respectively, in its statutory reserves.

As a result of these PRC laws and regulations subject to the limit discussed above that require annual appropriations of 10% of after-tax income to be set aside, prior to payment of dividends as general reserve fund, the Company’s PRC subsidiaries are restricted in their ability to transfer a portion of their net assets to the Company. Amounts restricted include paid-in capital and statutory reserve funds of the Company’s directly owned PRC subsidiaries and the equity of the Consolidated VIEs, as determined pursuant to PRC generally accepted accounting principles, totaling an aggregate of RMB1,763,493 (US$284,223) as of December 31, 2014.

Earnings (Loss) Per Share

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

26.

EARNINGS (LOSS) PER SHARE

Basic and diluted earnings (loss) per share for each of the years presented are calculated as follows:


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
*Numerator:*
Net profit (loss)		57,656			(47,003	)		(328,477	)		(52,942	)
Less: net profit attributable to noncontrolling interest and redeemable noncontrolling interest		(1,332	)		(1,223	)		(20,003	)		(3,224	)

Net profit (loss) attributable to ordinary shareholders		56,324			(48,226	)		(348,480	)		(56,166	)
Plus: deemed dividend in relation to accretion of redeemable noncontrolling interests		—			—			(7,850	)		(1,265	)

Adjusted net profit (loss) attributable to ordinary shareholders		56,324			(48,226	)		(356,330	)		(57,431	)

*Denominator:*

Weighted-average number of shares outstanding—basic		342,533,167			364,353,974			401,335,788			401,335,788
Weighted-average number of stock options and RSUs granted in connection with the stock option plan		14,251,042			—			—			—

Weighted-average number of shares outstanding—diluted		356,784,209			364,353,974			401,335,788			401,335,788

Earnings (loss) per share—Basic:
Net profit (loss)		0.16			(0.13	)		(0.89	)		(0.14	)

		0.16			(0.13	)		(0.89	)		(0.14	)

Earnings (loss) per share—Diluted:
Net profit (loss)		0.16			(0.13	)		(0.89	)		(0.14	)

		0.16			(0.13	)		(0.89	)		(0.14	)

In 2013, the Company issued 6,000,000 ordinary shares to its share depositary bank which will be used to settle stock option awards upon their exercise. No consideration was received by the Company for this issuance of ordinary shares. These ordinary shares are legally issued and outstanding but are treated as escrowed shares for accounting purposes and therefore, have been excluded from the computation of earnings per share. Any ordinary shares not used in the settlement of stock option awards will be returned to the Company.

Contingently issuable shares related to the portion of contingent consideration for the acquisitions in the form of shares that are based on targets that have been fixed are included in the computation of basic earnings per share as the Company does not expect any circumstances under which these shares would not be issued.

Share Capital

12 Months Ended

Dec. 31, 2014

Share Capital

27.

SHARE CAPITAL

In May 2014, the Company’s annual general meeting of shareholders authorised share capital of the Company be increased from (A) US$7,700 divided into (i) 470,000,000 Class A Ordinary Shares of a nominal or par value of US$0.00001 each and (ii) 300,000,000 Class B Ordinary Shares of a nominal or par value of US$0.00001 each to (B) US$15,000 divided into (i) 1,200,000,000 Class A Ordinary Shares of a nominal or par value of US$0.00001 each and (ii) 300,000,000 Class B Ordinary Shares of a nominal or par value of US$0.00001 each, by the creation of an additional 730,000,000 Class A Ordinary Shares with a nominal or par value of US$0.00001 each to rank pari passu in all respects with the existing Class A Ordinary Shares.

Holders of Class A Ordinary Shares and Class B Ordinary Shares are entitled to the same rights except for voting and conversion rights. In respect of matters requiring a shareholder’s vote, each Class A Ordinary Share is entitled to one vote and each Class B Ordinary Share is entitled to 10 votes. Each Class B Ordinary Share is convertible into one Class A Ordinary Share at any time by the holder. Class A Ordinary Shares are not convertible into Class B Ordinary Shares under any circumstances. Upon any transfer of Class B Ordinary Shares by a holder to any person or entity which is not an affiliate of such holder, such Class B Ordinary Shares will be automatically converted into an equal number of Class A Ordinary Shares.

In July 2012, the company repurchased 2,686,965 Class B ordinary shares from Sunrise at par value. Such shares were cancelled immediately.

In May 2013, the Company issued 5,282,100 Class A ordinary shares to the sellers of Fastweb and Tianwang and Yilong in settlement of the contingent purchase considerations. In October 2013, the Company issued 34,683,042 Class A ordinary shares to Esta for an aggregate cash consideration of RMB533,301. In addition, Esta purchased 5,316,960 Class A ordinary shares from the Company’s existing shareholders for a total cash consideration of RMB78,685 which was paid to the selling shareholders through the Company.

In 2014, the Company issued 2,666,898 Class A ordinary shares to the sellers of Fastweb and Tianwang and Yilong in settlement of the contingent purchase considerations. In 2014, the Company issued 3,683,712 Class A ordinary shares to Galaxy ENet Inc. (Note 22(b)).

Redeemable Noncontrolling Interests

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74512-122707

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187143-122770

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph d
-Article 4

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

+ Details

Redeemable Noncontrolling Interests

12 Months Ended

Dec. 31, 2014

Noncontrolling Interest [Abstract]

28.

REDEEMABLE NONCONTROLLING INTERESTS


	For the year ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Balance as of January 1		—		—		—		—
Acquisition of Aipu Group (Note 4)		—		—		748,040		120,562
Current profit		—		—		17,816		2,872
Accretion of redeemable noncontrolling interests		—		—		7,850		1,265

Balance as of December 31		—		—		773,706		124,699

Fair Value Measurements

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value Measurements

29.

FAIR VALUE MEASUREMENTS

The Company applies ASC 820, Fair Value Measurements and Disclosures. ASC 820 defines fair value, establishes a framework for measuring fair value and expands disclosures about fair value measurements. ASC 820 requires disclosures to be provided on fair value measurement.

ASC 820 establishes a three-tier fair value hierarchy, which prioritizes the inputs used in measuring fair value as follows:

Level 1 — Observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets.

Level 2 — Include other inputs that are directly or indirectly observable in the marketplace.

Level 3 — Unobservable inputs which are supported by little or no market activity.

ASC 820 describes three main approaches to measuring the fair value of assets and liabilities: (1) market approach; (2) income approach; and (3) cost approach. The market approach uses prices and other relevant information generated from market transactions involving identical or comparable assets or liabilities. The income approach uses valuation techniques to convert future amounts to a single present value amount. The measurement is based on the value indicated by current market expectations about those future amounts. The cost approach is based on the amount that would currently be required to replace an asset.

Cash equivalents, fixed rate time deposits, floating rate time deposits and bonds payable are classified within Level 1 because they are valued by using quoted market prices. The fair values of the Company’s floating rate principal guaranteed investments and fixed rate principal guaranteed investments are as measured and held-to-maturity investments as disclosed are determined based on the discounted cash flow model using the discount curve of market interest rates.

The mandatorily redeemable noncontrolling interests (Note 1(c)), the contingent considerations for the acquired businesses (Note 4) and the share-settled bonuses are classified within Level 3. The fair value of the noncontrolling interest was estimated using the income approach based on the discounted cash flows (“DCF”) model, with adjustments for the lack of control and lack of marketability that market participants would consider when estimating the fair value of the noncontrolling interests in the Consolidated VIE. The contingent considerations are based on the achievement of certain financial targets in accordance with the sales and purchase agreements for the various periods, as well as other non-financial measures. The revenue and net profit targets were calculated based on the DCF model. The DCF model involves applying appropriate discount rates to estimated cash flow forecasts that are based on forecasts of revenue and costs. Estimation of future cash flows requires the Company to make complex and subjective judgments regarding the acquired businesses’ projected financial and operating results, unique business risks, limited operating histories and future prospects. The acquired businesses’ revenue forecasts were based on expected annual growth rates which were derived from a combination of our historical experience and industry trends. The fair value of the share-settled bonuses was estimated using the performance bonuses that the Company estimates to be settled in shares and the observable market prices of the underlying ADSs of the Company.

The redeemable noncontrolling interests of Aipu Group are classified within level 3. The fair value of the redeemable noncontrolling interests at the acquisition date was determined with the estimated operating and financial results for the year ending December 31, 2014, 2015 and 2016. The fair value of embedded put option in the redeemable noncontrolling interests was estimated by Monte Carlo Method, which was calculated by multiplying net income and simulated earnings multiple ratio for the year ending December 31, 2014, 2015 and 2016.

Assets and liabilities measured at fair value on a recurring basis are summarized below:


	Fair value measurement using:
	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Unobservable inputs (Level 3)		Fair value at December 31, 2013
	RMB		RMB		RMB		RMB
Cash equivalents:
- Fixed rate time deposits		821,718		—		—		821,718

Held-to-maturity short-term investments:
- Fixed rate time deposits		127,023		—		—		127,023
- Floating rate time deposits		74,803		—		—		74,803
- Floating rate principal guaranteed investments		—		900,000		—		900,000

Assets		1,023,544		900,000		—		1,923,544

Long-term borrowings:
- Bonds payable		1,027,140		—		—		1,027,140

Other liabilities:
- Share-settled bonuses		—		—		6,441		6,441
- Mandatorily redeemable noncontrolling interests in Asia Cloud Investment		—		—		100,000		100,000

Amounts due to related parties:
- Contingent consideration payable in relation to the acquisition of subsidiaries		—		—		178,265		178,265

Liabilities		1,027,140		—		284,706		1,311,846


	Fair value measurement using:
	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Unobservable inputs (Level 3)		Fair value at December 31, 2014
	RMB		RMB		RMB		RMB		US$
Cash equivalents:
- Fixed rate time deposits		116,677		—		—		116,677		18,805

Held-to-maturity short-term investments:
- Fixed rate time deposits		11,242		—		—		11,242		1,812
- Fixed rate principal guaranteed investments		—		900,000		—		900,000		145,054

Assets		127,919		900,000		—		1,027,919		165,671

Long-term borrowings:
- Bonds payable		2,211,274		—		—		2,211,274		356,393

Other liabilities:
- Share-settled bonuses		—		—		14,913		14,913		2,404
- Mandatorily redeemable noncontrolling interests in Asia Cloud Investment		—		—		100,000		100,000		16,117

Amounts due to related parties:
- Contingent consideration payable in relation to the acquisition of subsidiaries		—		—		548,017		548,017		88,324

Liabilities		2,211,274				662,930		2,874,204		463,238

The following table presents a reconciliation of all liabilities measured at fair value on a recurring basis using significant unobservable inputs (level 3):


	Contingent consideration payable
	RMB
Fair value at January 1, 2013		142,783
Contingent purchase consideration payable — Tianwang and Yilong (Note 4)		55,889
Contingent purchase consideration payable — iJoy (Note 4)		72,294
Changes in the fair value		55,882
Payment of cash consideration		(22,868	)
Reclassification to equity upon resolution of contingencies		(125,715	)

Transfers in and/or out of Level 3		—
Fair value at December 31, 2013		178,265

Contingent purchase consideration payable — Aipu Group (Note 4)		48,971
Contingent purchase consideration payable — Dermot Entities (Note 4)		355,067
Contingent purchase consideration payable — Other acquisitions (Note 4)		14,678
Changes in the fair value		22,629
Payment of cash consideration		(4,870	)
Reclassification to equity upon resolution of contingencies		(66,280	)
Foreign exchange gain/(loss) generate from payment of cash consideration		(443	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2014		548,017

Fair value at December 31, 2014 (US$)		88,324


	Share-settled bonuses
	RMB
Fair value at January 1, 2013		—
Increase in bonuses settled in shares during 2013		5,894
Changes in the fair value		4,566
Reclassification to equity		(1,564	)
Reclassification to “Accrued expenses and other payables-Others”		(2,455	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2013		6,441

Increase in bonuses settled in shares during 2014		14,862
Changes in the fair value		9,141
Reclassification to equity		(15,454	)
Reclassification to “Accrued expenses and other payables-Others”		(77	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2014		14,913

Fair value at December 31, 2014 (US$)		2,404


	Mandatorily redeemable noncontrolling interests in Asia Cloud Investment
	RMB
Fair value at January 1, 2014		100,000
Changes in the fair value		—
Transfers in and/or out of Level 3		—

Fair value at December 31, 2014		100,000

Fair value at December 31, 2014 (US$)		16,117

Changes in the fair value of the contingent purchase consideration payable will be recorded in the consolidated financial statements of operations. The Company’s valuation techniques used to measure the fair value of the contingent consideration payable were derived from management’s assumptions of estimations as discussed above.

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

12 Months Ended

Dec. 31, 2014

Commitments and Contingencies

30.

COMMITMENTS AND CONTINGENCIES

Capital commitments

As of December 31, 2014, the Company has the following commitments to purchase certain computer and network equipment and construction in progress:


	RMB		US$
2015		484,106		78,024
2016		334		54

		484,440		78,078

Operating lease commitments

The Company leases facilities in the PRC under non-cancelable operating leases expiring on different dates. For the years ended December 31, 2012, 2013 and 2014, total rental expenses for all operating leases amounted to RMB24,082, RMB30,853 and RMB56,247 (US$9,065), respectively.

As of December 31, 2014, the Company has future minimum lease payments under non-cancelable operating leases with initial terms in excess of one year in relation to office premises and data center space consisting of the following:


	RMB		US$
2015		87,699		14,135
2016		78,811		12,702
2017		74,166		11,953
2018		36,318		5,853
2019 and thereafter		149,585		24,109

		426,579		68,752

Payments under operating leases are expensed on a straight-line basis over the periods of their respective leases. The terms of the leases do not contain material rent escalation clauses or contingent rents.

Bandwidth and cabinet capacity purchase commitments

As of December 31, 2014, the Company had outstanding purchase commitments in relation to bandwidth and cabinet capacity consisting of the following:


	RMB		US$
2015		958,188		154,432
2016		75,800		12,217
2017		39,432		6,355
2018		29,556		4,764
2019 and thereafter		125,825		20,279

		1,228,801		198,047

Managed Network Services

As of December 31, 2014, the Company was in the process of negotiation with the seller of the Managed Network Entities on the quality assessment of the fiber optic network subsequent to the completion of construction. As this is a pending event subsequent to the acquisition which is unrelated to the original acquisition, the Company concluded that the accounting for any settlement should be separated from that of the business combination. Based on the Company’s best estimate, the fair value of the related contingent consideration in shares of RMB47,755, as determined based on the remeasured amount of December 31, 2012, is accrued as a contingent payable pursuant to ASC 450, Contingencies. The Company is negotiating with the seller of the Managed Network Entities to come to an agreement on the quality assessment of the fiber optic network as of December 31, 2014 and the Company’s estimate of the contingent payable remains unchanged.

Income Taxes

As of December 31, 2014, the Group has recognized an accrual of RMB20,453 (US$3,296) for unrecognized tax benefits and its interest (Note 23). The final outcome of the tax uncertainty is dependent upon various matters including tax examinations, interpretation of tax laws or expiration of statutes of limitation. However, due to the uncertainties associated with the status of examinations, including the protocols of finalizing audits by the relevant tax authorities, there is a high degree of uncertainty regarding the future cash outflows associated with these tax uncertainties. As of December 31, 2014, the Group classified the accrual for unrecognized tax benefits as a non-current liability.

Securities Litigation

The Company and certain of its officers and directors were named as defendants in two putative securities class actions filed in U.S. federal district courts in Texas. The complaints in both actions allege that certain of the Company’s financial statements and other public disclosures contained misstatements or omissions and assert claims under the U.S. securities laws. Putative plaintiffs in these actions have filed motions to consolidate the cases and for appointment of a lead plaintiff, which remain pending before the Court. As the actions remain in their preliminary stages, the Company’s management is unable to express any opinion on the likelihood of an unfavorable outcome or any estimate of the amount or range of any potential loss.

Subsequent Events

12 Months Ended

Dec. 31, 2014

Subsequent Events [Abstract]

Subsequent Events

31.

SUBSEQUENT EVENTS

Investment from Kingsoft, Xiaomi and Esta

The Company entered into definitive share purchase agreements with affiliates of Kingsoft, Xiaomi and Esta in late November and early December 2014.

Pursuant to the agreement with Kingsoft entered into on November 29, 2014, Kingsoft agreed to make a total of US$172,000 investment in 21Vianet, with a purchase price of US$3.00 per ordinary share (the equivalent of US$18.00 per ADS). The investment will all be in newly issued 39,087,125 Class A and 18,250,268 Class B ordinary shares. Pursuant to the agreement with Xiaomi entered into on November 30, 2014, Xiaomi agreed to make a total of US$50,000 investment in 21Vianet, with a purchase price of US$3.00 per ordinary share (the equivalent of US$18.00 per ADS). The investment will all be in newly issued 6,142,410 Class A and 10,524,257 Class B ordinary shares. Pursuant to the agreement with Temasek entered into on December 1, 2014, Temasek agreed to make a total of US$74,000 investment in 21Vianet, with a purchase price of US$3.00 per ordinary share (the equivalent of US$18.00 per ADS). The investment will be in newly issued 24,668,020 Class A ordinary shares, or the equivalent of 4,111,337 ADSs.

The transactions were subsequently closed on January 15, 2015.

Upon the closing of the above investment transaction with Kingsoft, 21Vianet and Kingsoft has signed a business cooperation memorandum. Under the terms of the memorandum, 21Vianet will build, operate, maintain and provide technical support for new, state-of-art data centers in China to meet Kingsoft and its designated third party’s next-generation cloud infrastructure requirements. Upon meeting certain conditions, 21Vianet will lease to Kingsoft and its designated third party (agreed to by 21Vianet) a combined minimum of 5,000 cabinets at the then most-favorable price over the next three years.

Parent Company Only Condensed Financial Information

12 Months Ended

Dec. 31, 2014

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Parent Company Only Condensed Financial Information

32.

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION

Condensed balance sheets


	Note	As of December 31,
		2013			2014
		RMB			RMB			US$
ASSETS
Current assets
Cash			590,682			3,891			627
Restricted cash			190,000			100,000			16,117
Short-term investments			81,826			11,242			1,812
Prepaid expenses and other current assets			76,606			52,989			8,538
Amount due from a related party	(b)		24,387			24,476			3,945
Amount due from subsidiaries	(b)		1,672,335			2,078,468			334,988

Total current assets			2,635,836			2,271,066			366,027

Non-current assets
Restricted cash			100,000			—			—
Investments in subsidiaries			895,390			2,659,202			428,586
Amount due from a related party	(b)		—			70,000			11,282
Other non-current assets			26,116			27,900			4,497

Total non-current assets			1,021,506			2,757,102			444,365

Total assets			3,657,342			5,028,168			810,392

LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accrued expenses and other payables			255			4,772			769
Interest payable			21,265			7,390			1,191
Amount due to related parties	(b)		99,944			268,290			43,240

Total current liabilities			121,464			280,452			45,200

Non-current liabilities
Amount due to related parties	(b)		78,321			280,728			45,245
Bonds payable	(d)		998,505			2,264,064			364,901

Total non-current liabilities			1,076,826			2,544,792			410,146

Total liabilities			1,198,290			2,825,244			455,346

Shareholders’ equity:
Class A Ordinary shares (par value of US$0.00001 per share; 470,000,000 and 1,200,000,000 shares authorized; 344,745,991 and 346,803,765 shares issued and outstanding as of December 31, 2013 and 2014, respectively)			22			23			3
Class B Ordinary shares (par value of US$0.00001 per share; 300,000,000 and 300,000,000 shares authorized; 53,480,544 and 49,430,544 shares issued and outstanding as of December 31, 2013 and 2014, respectively)			4			3			1
Additional paid-in capital			3,836,967			4,117,232			663,577
Accumulated other comprehensive loss			(82,589	)		(65,754	)		(10,598	)
Accumulated deficit			(1,286,435	)		(1,634,915	)		(263,500	)
Treasury stock			(8,917	)		(213,665	)		(34,437	)

Total shareholders’ equity			2,459,052			2,202,924			355,046

Total liabilities and shareholders’ equity			3,657,342			5,028,168			810,392

Condensed statements of operations


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Operating Expenses
General and administrative expenses		(78,611	)		(16,741	)		(125,859	)		(20,286	)
Changes in the fair value of contingent purchase consideration payables		5,693			(99,874	)		(22,629	)		(3,647	)

Operating loss		(72,918	)		(116,615	)		(148,488	)		(23,933	)
Other income (expense)		10,570			(41,475	)		(199,418	)		(32,140	)
Share of profits (losses) from subsidiaries and Consolidated VIEs		118,672			109,864			(574	)		(93	)

Profit (loss) before income taxes		56,324			(48,226	)		(348,480	)		(56,166	)
Income tax expense		—			—			—			—

Net profit (loss)		56,324			(48,226	)		(348,480	)		(56,166	)

Condensed statements of comprehensive income (loss)


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Net profit (loss)		56,324			(48,226	)		(348,480	)		(56,166	)
Other comprehensive (loss) income, net of tax of nil:
Foreign currency translation adjustments, net of tax of nil		(3,942	)		(21,357	)		16,835			2,713

Other comprehensive income (loss), net of tax of nil:
Comprehensive income (loss)		52,382			(69,583	)		(331,645	)		(53,453	)

Comprehensive income (loss) attributable to the Company’s ordinary shareholders		52,382			(69,583	)		(331,645	)		(53,453	)

Condensed statements of cash flows


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Net cash used in operating activities		(6,300	)		(26,630	)		(23,952	)		(3,860	)
Net cash generated from (used in) investing activities		272,873			(67,455	)		(1,186,053	)		(191,158	)
Net cash (used in) generated from financing activities		(286,700	)		670,670			623,214			100,444

Net (decrease) increase in cash		(20,127	)		576,585			(586,791	)		(94,574	)
Cash at beginning of the year		34,224			14,097			590,682			95,201

Cash at end of the year		14,097			590,682			3,891			627

(a)

Basis of presentation

In the Company-only financial statements, the Company’s investment in subsidiaries is stated at cost plus equity in undistributed earnings of subsidiaries since inception.

The Company records its investment in its subsidiary under the equity method of accounting as prescribed in ASC 323-10, Investment-Equity Method and Joint Ventures, and such investment is presented on the balance sheet as “Investment in subsidiaries” and the share of the subsidiaries’ profit or loss is presented as “Share of profits (losses) of subsidiaries and Consolidated VIEs” on the statements of operations.

The subsidiaries did not pay any dividends to the Company for the years presented.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted and as such, these Company-only financial statements should be read in conjunction with the Group’s consolidated financial statements.

(b)

Related party transactions

The Company had the following related party balances as of December 31, 2013 and 2014:


	December 31,
	2013		2014
	RMB		RMB		US$
Amount due from subsidiaries
- 21Vianet HK		1,581,289		2,056,545		331,455
- 21Vianet Beijing		91,042		1,726		278
- Xi’an Holding		4		6,123		987
- Venture		—		14,074		2,268

		1,672,335		2,078,468		334,988

Amount due from related parties
Current:
- Seller of iJoy		24,387		24,476		3,945

Non-current:
- Seller of Aipu Group		—		70,000		11,282

Amount due to related parties
Current:
- Seller of Tianwang and Yilong		19,605		2,970		479
- Seller of iJoy		63,602		50,506		8,140
- Seller of GD Tianying		—		9,434		1,520
- Seller of Dermot Entities		—		205,380		33,101
- Seller of Gehua		16,737		—		—

		99,944		268,290		43,240

Non-current:
- Sellers of Tianying		—		17,585		2,834
- Seller of Aipu Group		—		67,531		10,884
- Seller of Dermot Entities		—		177,220		28,563
- Seller of iJoy		58,487		18,392		2,964
- Seller of Tianwang and Yilong		19,834		—		—

		78,321		280,728		45,245

(c)

Commitments

The Company does not have any significant commitments as of any of the years presented.

(d)

Bonds payable

On March 22, 2013, the Company issued and sold 2016 Bonds with an aggregate principal amount of RMB1,000,000 at a coupon rate of 7.875% per annum. The 2016 Bonds will mature on March 22, 2016. The 2016 Bonds were listed and quoted on the Official List of the Singapore Exchange Securities Trading Limited. Interest on the Bonds is payable semi-annually in arrears on March 22 and September 22 in each year, beginning September 22, 2013. The net proceeds from the 2016 Bonds, after deducting issuance costs of RMB25,189 and a discount of RMB1,970, were RMB972,841, which will be used for construction of new data centers and other general corporate purposes. The effective interest rate of the 2016 Bonds is 9.29%. On June 30, 2014, the Company repurchased 73.57% of the outstanding 2016 Bonds with the total consideration of RMB776,163 (US$125,095) including payment of accrued interests of RMB15,556 (US$2,507). The debt extinguishment loss amounting to RMB41,581 (US$6,702) was recognized in earnings upon the repurchase.

On June 26, 2014, the Company issued and sold 2017 Bonds with an aggregate principal amount of RMB2,000,000 (equivalent to US$322,341) at a coupon rate of 6.875% per annum. The 2017 Bonds will mature on June 26, 2017. The 2017 Bonds were listed and quoted on the Official List of the Singapore Exchange Securities Trading Limited. Interest on the 2017 Bonds is payable semi-annually in arrears on June 26 and December 26 in each year, beginning December 26, 2014. Net proceeds from the 2017 Bonds after deducting issuance costs of RMB19,360 (US$3,120), were RMB1,980,640 (US$319,221). The proceeds from issuance of 2017 Bonds was used to new data centers, fund acquisitions, repurchase the 2016 Bonds and for general corporate purposes. The effective interest rate of the 2017 Bonds is 7.39%.

Both the 2016 Bonds and the 2017 Bonds are unsecured and rank senior in right of payment to any of the Company’s indebtedness that is expressly subordinated to the bonds; equal in right of payment to any of the Company’s liabilities that are not so subordinated; but rank lower than any secured indebtedness of the Company and all liabilities (including trade payables) of the Company’s subsidiaries and Consolidated VIEs.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

Principles of Consolidation

Basis of Presentation

(a)

Basis of Presentation

The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“U.S. GAAP”).

(b)

Principles of Consolidation

Use of Estimates

(c)

Use of estimates

Foreign Currency

(d)

Foreign Currency

Convenience Translation

(e)

Convenience Translation

Cash and Cash Equivalents

(f)

Cash and Cash Equivalents

Restricted Cash

(g)

Restricted cash

Short-term investments

(h)

Short-term investments

No impairment loss had been recorded during each of the three years ended December 31, 2014.

Accounts Receivable and Allowance for Doubtful Accounts

(i)

Accounts Receivable and Allowance for Doubtful Accounts

(j)

Inventories

Property and Equipment

(k)

Property and equipment

Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows:


Category		Estimated useful life
Property		25-46 years
Leasehold improvements		Over the shorter of lease term or the estimated useful lives of the assets
Optical fibers		10-20 years
Computer and network equipment		4-11 years
Office equipment		5 years
Motor vehicles		5 years

Intangible Assets

(l)

Intangible assets

Intangible assets have weighted average useful lives from the date of purchase as follows:


Purchased software			6.4 years
Radio spectrum license			15 years
Network use right			20 years
Contract backlog *			5.2 years
Customer relationships *			9.5 years
Supplier relationships *			8.9 years
Licenses *			15 years
Trade Name *			15.1 years
Platform software *			5 years
Non-compete agreement *			5.1 years
Internal use software			1.6 years
Property management relationship *			9 years

Acquired in the acquisitions of subsidiaries (Note 4).

Land use rights

(m)

Land use rights

Long-Term Investments

(n)

Long-term investments

The Company’s long-term investments consist of cost method investments and equity method investments.

No impairment loss had been recorded during each of the three years ended December 31, 2014.

Impairment of Long-Lived Assets

(o)

Goodwill

(p)

Impairment of long-lived assets

Fair Value of Financial Instruments

(q)

Fair value of financial instruments

Revenue Recognition

(r)

Revenue recognition

Cost of Revenues

(s)

Cost of revenues

Advertising Expenditures

(t)

Advertising expenditures

Research and Development Expenses

(u)

Research and development expenses

Government Grants

(v)

Government grants

Leases

(w)

Leases

Capitalized interest

(x)

Capitalized interest

As a result of total interest costs capitalized during the period, the interest expense for the year ended December 31, 2012, 2013 and 2014, was as follows:


	2012			2013			2014
	RMB			RMB			RMB			US$
Interest expense and amortization cost of bonds		—			69,785			130,355			21,009
Interest expense on bank and other borrowings		17,807			43,839			66,699			10,750
Interest expense on capital lease		5,287			31,863			40,849			6,584

Total interest costs		23,094			145,487			237,903			38,343

Less: Total interest costs capitalized		(11,718	)		(8,712	)		(5,883	)		(948	)

Interest expense, net		11,376			136,775			232,020			37,395

Income Taxes

(y)

Income taxes

The Company has elected to classify interest and penalties related to unrecognized tax benefits, if and when required, as part of “income tax” in the consolidated statements of operations.

Share-Based Compensation

(z)

Share-based compensation

Earnings Per Share

(aa)

Earnings per share

Share Repurchase Program

(bb)

Share repurchase program

Comprehensive income (loss)

(cc)

Comprehensive income (loss)

Segment Reporting

(dd)

Segment reporting

Employee Benefits

(ee)

Employee benefits

Comparative information

(ff)

Comparative information

Certain items reported in the prior year’s consolidated financial statements have been reclassified to conform to the current year’s presentation.

Recent Accounting Pronouncements

(gg)

Recent accounting pronouncements

Organization (Tables)

12 Months Ended

Dec. 31, 2014

Summary of Subsidiaries and Consolidated Variable Interest Entities

The Company is principally engaged in the provision of Hosting and related services and Managed Network Services. .

(a)

As of December 31, 2014, the significant subsidiaries of the Company and consolidated variable interest entities are as follows:


Entity	Date of incorporation/ Acquisition	Place of incorporation	Percentage of direct ownership by the Company			Principal activities
			Direct
Subsidiaries:
21ViaNet Group Limited (“21Vianet HK”)	May 25, 2007	Hong Kong		100	%	Investment holding
21ViaNet Data Center Co., Ltd. (“21Vianet China”) (1)	June 12, 2000	PRC		100	%	Provision of technical and consultation services and rental of long-lived assets
Fastweb International Holdings (“Fastweb Holdings”) (4)	September 9, 2012	Cayman Islands		100	%	Investment holding
Hongkong Fastweb Holdings Co., Limited (“Fastweb HK”) (4)	September 9, 2012	Hong Kong		100	%	Investment holding
Beijing Fastweb Technology Co., Ltd. (“Fastweb Technology”) (1) / (4)	September 9, 2012	PRC		100	%	Dormant company
21Vianet (Foshan) Technology Co., Ltd. (“FS Technology”) (1)	December 20, 2011	PRC		100	%	Trading of network equipment, provision of technical and internet data center services
21Vianet Anhui Suzhou Technology Co., Ltd. (“SZ Technology”) (1)	November 16, 2011	PRC		100	%	Trading of network equipment
21Vianet Hangzhou Information Technology Co., Ltd. (“HZ Technology”) (1)	March 4, 2013	PRC		100	%	Dormant company
21Vianet Mobile Limited (“21V Mobile”) (6)	April 30, 2013	Hong Kong		100	%	Investment holding
Joytone Infotech Co., Ltd. (“SZ Zhuoaiyi”) (1) / (6)	April 30, 2013	PRC		100	%	Provision of technical and consultation services
Abitcool (China) Broadband Inc. (“aBitCool DG”) (1)	June 13, 2014	PRC		100	%	Provision of telecommunication services
WiFire Group Inc. (“WiFire Group”)	March 7, 2014	British Virgin Islands		100	%	Investment holding
Diyixian.com Limited (“DYX”) (9)	August 10, 2014	Hong Kong		100	%	Provision of virtual private network services
Dermot Holding Limited (“Dermot BVI”) (9)	August 10, 2014	British Virgin Islands		100	%	Investment holding

Variable Interest Entities (the “VIEs”):
Beijing Yiyun Network Technology Co., Ltd. (formerly known as Beijing aBitCool Network Technology Co., Ltd.) (“21Vianet Technology”) (1) / (2)	October 22, 2002	PRC		—		Provision of internet data center and managed network services
Beijing iJoy Information Technology Co., Ltd. (“BJ iJoy”) (1) / (2) / (6)	April 30, 2013	PRC		—		Provision of internet data center, content delivery network services
aBitCool Small Micro Network Technology (BJ) Co., Ltd. (“aBitCool BJ) (1) / (2)	April 1, 2014	PRC		—		Provision of telecommunication services

Held directly by BJ iJoy:
Shanghai iJoy Information Technology Co., Ltd. (“SH iJoy”) (1) / (2) / (6)	May 30, 2013	PRC		—		Provision of internet data center, content delivery network services

Held directly by aBitCool BJ:
Shanghai Guotong Network Co., Ltd. (“SH Guotong”) (1) / (2) / (10)	July 31, 2014	PRC		—		Provision of content delivery network services

Held directly by 21Vianet Technology:
Beijing 21Vianet Broad Band Data Center Co., Ltd. (“21Vianet Beijing”) (1) / (2)	March 15, 2006	PRC		—		Provision of internet data center and managed network services
Dongguan Asia Cloud Investment Co., Ltd. (“Asia Cloud Investment”) (1) / (2) / (7)	July 30, 2013	PRC		—		Investment holding

Held directly by Asia Cloud Investment:
Dongguan Asia Cloud Network Technology Co., Ltd. (“Asia Cloud Technology”) (1) / (2) / (7)	August 16, 2013	PRC		—		Dormant company

Held directly by 21Vianet Beijing:
Beijing Chengyishidai Network Technology Co., Ltd. (“CYSD”) (1) / (2) / (3)	September 30, 2010	PRC		—		Provision of managed network services
Zhiboxintong (Beijing) Network Technology Co., Ltd. (“ZBXT”) (1) / (2) / (3)	September 30, 2010	PRC		—		Provision of managed network services
Guangzhou Gehua Network Technology and Development Co., Ltd. (“Gehua”) (1) / (2)	October 8, 2011	PRC		—		Provision of managed network services
Langfang Xunchi Computer Data Processing Co., Ltd. (“LF Xunchi”) (1) / (2)	December 19, 2011	PRC		—		Dormant company
Beijing Fastweb Network Technology Co., Ltd. (“BJ Fastweb”) (1) / (2) / (4)	September 9, 2012	PRC		—		Provision of internet data center and internet content delivery network services
Shanghai Blue Cloud Technology Co., Ltd. (“SH Blue Cloud”) (1) / (2)	March 21, 2013	PRC		—		Provision of Office 365 and Windows Azure platform services
Beijing Tianwang Online Communication Technology Co., Ltd. (“BJ Tianwang”) (1) / (2) / (5)	February 28, 2013	PRC		—		Provision of managed network services and virtual private network services
Beijing Yilong Technology Co., Ltd. (“BJ Yilong”) (1) / (2) / (5)	February 28, 2013	PRC		—		Provision of managed network services and virtual private network services
Beijing Yichengtaihe Investment Co., Ltd. (“BJ Yichengtaihe”) (1) / (2) / (11)	September 30, 2014	PRC		—		Dormant Company

Held directly by LF Xunchi:
Sichuan Aipu Network Co., Ltd. (“SC Aipu”) (1) / (2) / (8)	May 31, 2014	PRC		—		Provision of community network services and business network services

Held directly by DYX:
DYXnet Limited (“DYXnet”) (9)	August 10, 2014	Hong Kong		100	%	Dormant Company

Held by DYX and LF Xunchi:
Shenzhen Diyixian Communication Co., Ltd. (“SZ DYX”) (1) / (9)	August 10, 2014	PRC		50	%	Provision of virtual private network services

(1)

Collectively, the “PRC Subsidiaries”.

(2)

Collectively, the “Consolidated VIEs”.

(3)

On September 30, 2014, the Company through its subsidiary, 21Vianet Beijing acquired CYSD, ZBXT and its subsidiaries (collectively, the “Managed Network Entities”).

(4)

On September 9, 2012, the Company and its subsidiary, 21Vianet Beijing, acquired 100% equity interest in Fastweb Holding and its subsidiaries (collectively referred to as “Fastweb”) (Note 4).

(5)

(6)

On April 30, 2013, the Company acquired 100% equity interest in 21V Mobile and its subsidiaries (collectively referred to as “iJoy”) (Note 4).

(7)

(8)

(9)

On August 10, 2014, the Company and its subsidiary, LF Xunchi, acquired 100% equity interest Dermot BVI and its subsidiaries (collectively referred to as “Dermot Entities”) (Note 4).

(10)

On August 1, 2014, the Company through its subsidiary, aBitCool BJ acquired 100% equity interest in the entity.

(11)

On September 30, 2014, the Company through its subsidiary, 21Vianet Beijing acquired 100% equity interest in the entity, which was accounted for an asset acquisition (Note 4).

Consolidated VIE before Eliminating Intercompany Balances


	As of December 31,
	2013		2014
	RMB		RMB		US$
ASSETS
Current assets:
Cash and cash equivalents		259,987		369,597		59,568
Restricted cash		3,020		61,649		9,936
Accounts receivable (net of allowance for doubtful accounts of RMB547 and RMB10,012 (US$1,614) as of December 31, 2013 and 2014, respectively)		605,205		677,375		109,173
Inventories		—		9,673		1,559
Short-term investments		900,000		900,000		145,054
Prepaid expenses and other current assets		110,865		258,474		41,658
Deferred tax assets		19,091		33,717		5,434
Amounts due from a related party		9,800		9,800		1,579

Total current assets		1,907,968		2,320,285		373,961

Non-current assets:
Property and equipment, net		813,939		1,945,176		313,505
Intangible assets, net		230,607		904,921		145,847
Land use right		—		66,175		10,665
Goodwill		410,500		1,146,570		184,794
Deferred tax assets		17,202		40,363		6,505
Amount due from a related party		—		28,500		4,593
Other non-current assets		11,645		65,942		10,628
Long-term investments		98,526		110,626		17,830

Total non-current assets		1,582,419		4,308,273		694,367

Total assets		3,490,387		6,628,558		1,068,328


	As of December 31,
	2013		2014
	RMB		RMB		US$
Current liabilities:
Short-term bank borrowings		173,726		160,181		25,816
Accounts and notes payable		186,381		340,519		54,882
Accrued expenses and other payables		195,816		375,124		60,459
Advance from customers		546		97,679		15,743
Income tax payable		11,427		27,677		4,461
Deferred revenue		32,558		338,655		54,581
Amount due to inter-companies (1)		394,418		491,522		79,219
Amount due to related parties (2)		47,755		53,371		8,602
Current portion of capital lease obligation		14,600		54,984		8,862
Current portion of other long-term borrowings		—		900,000		145,054
Deferred government grants		—		6,150		991
Deferred tax liabilities		3,115		2,696		435

Total current liabilities		1,060,342		2,848,558		459,105

Non-current liabilities:
Amount due to inter-companies		240,337		1,137,850		183,388
Other long-term borrowings		900,000		—		—
Non-current portion of capital lease obligations		337,122		458,632		73,918
Unrecognized tax benefits		18,559		20,453		3,296
Deferred tax liabilities		74,417		227,821		36,718
Deferred government grants		18,046		27,422		4,420
Deferred revenue		—		74,044		11,934
Mandatorily redeemable noncontrolling interests		100,000		100,000		16,117

Total non-current liabilities		1,688,481		2,046,222		329,791

Total liabilities		2,748,823		4,894,780		788,896


	For the Year Ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Net revenues		1,527,626		2,051,248		2,695,021		434,359
Net profit		122,552		179,049		175,521		28,289


	For the Year Ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Net cash provided by operating activities		169,304			195,659			434,865			70,088
Net cash used in investing activities		(205,069	)		(1,272,863	)		(808,117	)		(130,245	)
Net cash provided by financing activities		110,076			1,168,139			480,045			77,369
Net increase in cash and cash equivalents		74,311			90,935			106,793			17,212

(1)

(2)	Information with respect to related parties is discussed in Note 24.

Tabular disclosure of the significant judgments and assumptions made in determining whether a variable interest (as defined) held by the entity requires the variable interest entity (VIE) (as defined) to be consolidated and (or) disclose information about its involvement with the VIE, individually or in aggregate (as applicable); the nature of restrictions, if any, on the consolidated VIE's assets and on the settlement of its liabilities reported by an entity in its statement of financial position, including the carrying amounts of such assets and liabilities; the nature of, and changes in, the risks associated with involvement in the VIE; how involvement with the VIE affects the entity's financial position, financial performance, and cash flows; the lack of recourse if creditors (or beneficial interest holders) of the consolidated VIE have no recourse to the general credit of the primary beneficiary (if applicable); the terms of arrangements, giving consideration to both explicit arrangements and implicit variable interests, if any, that could require the entity to provide financial support to the VIE, including events or circumstances that could expose the entity to a loss; the methodology used by the entity for determining whether or not it is the primary beneficiary of the variable interest entity; the significant factors considered and judgments made in determining that the power to direct the activities of a VIE that most significantly impact the VIE's economic performance are shared (as defined); the carrying amounts and classification of assets and liabilities of the VIE included in the statement of financial position; the entity's maximum exposure to loss, if any, as a result of its involvement with the VIE, including how the maximum exposure is determined and significant sources of the entity's exposure to the VIE; a comparison of the carrying amounts of the assets and liabilities and the entity's maximum exposure to loss; information about any liquidity arrangements, guarantees, and (or) other commitments by third parties that may affect the fair value or risk of the entity's variable interest in the VIE; whether or not the entity has provided financial support or other support (explicitly or implicitly) to the VIE that it was not previously contractually required to provide or whether the entity intends to provide that support, including the type and amount of the support and the primary reasons for providing the support; and supplemental information the entity determines necessary to provide.

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2014

Estimated Useful Lives of Property and Equipment

Property and equipment are stated at cost and are depreciated using the straight-line method over the estimated useful lives of the assets, as follows:


Category		Estimated useful life
Property		25-46 years
Leasehold improvements		Over the shorter of lease term or the estimated useful lives of the assets
Optical fibers		10-20 years
Computer and network equipment		4-11 years
Office equipment		5 years
Motor vehicles		5 years

Weighted Average Useful Lives of Intangible Assets

Intangible assets have weighted average useful lives from the date of purchase as follows:


Purchased software			6.4 years
Radio spectrum license			15 years
Network use right			20 years
Contract backlog *			5.2 years
Customer relationships *			9.5 years
Supplier relationships *			8.9 years
Licenses *			15 years
Trade Name *			15.1 years
Platform software *			5 years
Non-compete agreement *			5.1 years
Internal use software			1.6 years
Property management relationship *			9 years

Acquired in the acquisitions of subsidiaries (Note 4).

Interest Expense

As a result of total interest costs capitalized during the period, the interest expense for the year ended December 31, 2012, 2013 and 2014, was as follows:


	2012			2013			2014
	RMB			RMB			RMB			US$
Interest expense and amortization cost of bonds		—			69,785			130,355			21,009
Interest expense on bank and other borrowings		17,807			43,839			66,699			10,750
Interest expense on capital lease		5,287			31,863			40,849			6,584

Total interest costs		23,094			145,487			237,903			38,343

Less: Total interest costs capitalized		(11,718	)		(8,712	)		(5,883	)		(948	)

Interest expense, net		11,376			136,775			232,020			37,395

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2014


	RMB
Cash consideration (i)		17,500
Share consideration * (ii)		10,455
Contingent consideration in cash * (iii)		19,977
Contingent ordinary shares issuance * (iii) (iv)		25,457

Total fair value of purchase price consideration		73,389

The Company determined the fair value of the share consideration and contingent consideration in cash and ordinary shares with the assistance of an independent third party valuation firm.

Details of the purchase consideration are as follows:

(i)

RMB15,500 and RMB2,000 of the above cash consideration were paid in April and December 2013, respectively.

(ii)

(iii)

(iv)


	RMB
Cash consideration (i)		24,663
Contingent consideration in cash * (ii)		25,146
Contingent ordinary shares issuance * (ii) (iii)		47,148

Total fair value of purchase price consideration		96,957

The Company determined the fair value of the contingent consideration in cash and ordinary shares with the assistance of an independent third party valuation firm.

Details of the purchase consideration are as follows:

(i)

(ii)

(iii)

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed


	RMB		US$
Cash consideration (i)		700,000		112,820
Contingent consideration in cash (ii) *		48,971		7,892

Total fair value of purchase price consideration		748,971		120,712

The Company determined the fair value of the contingent consideration with the assistance of an independent third party valuation firm.

Details of the purchase consideration are as follows:

RMB700,000 of the above cash consideration was paid in 2014.

ii.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the acquisition date of May 31, 2014:


	RMB			US$
Current assets		100,741			16,236
Other non-current assets		15,243			2,457
Property and equipment, net		681,979			109,915
Customer relationships (Note 10)		456,079			73,507
Trade names (Note 10)		110,748			17,849
Property management relationship (Note 10)		86,873			14,001
Non-compete agreements (Note 10)		26,670			4,298
Supplier relationships (Note 10)		23,453			3,780
Licenses (Note 10)		10,744			1,732
Purchased softwares		9,819			1,583
Land use right		12,143			1,957

Total assets acquired		1,534,492			247,315

Accounts and notes payable		(31,097	)		(5,012	)
Deferred revenue-current		(390,000	)		(62,857	)
Other current liabilities		(190,317	)		(30,673	)
Deferred tax liabilities-non-current		(124,356	)		(20,043	)
Other non-current liabilities		(1,367	)		(220	)

Total liabilities assumed		(737,137	)		(118,805	)

Net assets acquired		797,355			128,510
Purchase considerations		748,971			120,712
Fair value of redeemable non-controlling interests with the embedded put options (Note 28)		748,040			120,562

Goodwill		699,656			112,764

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed


	RMB		US$
Cash consideration (i)		598,500		96,461
Contingent ordinary shares issuance * (ii) (iii)		355,067		57,226

Total fair value of purchase price consideration		953,567		153,687

The Company determined the fair value of the contingent share consideration with the assistance of an independent third party valuation firm.

Details of the purchase consideration are as follows:

RMB 598,500 of the above cash consideration was paid in 2014.

ii.

iii.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the date of acquisition:


	RMB			US$
Current assets		77,886			12,552
Other non-current assets		655			106
Property and equipment, net		40,006			6,448
Customer relationships (Note 10)		207,767			33,486
Trade name (Note 10)		116,266			18,739
Contract backlog (Note 10)		34,259			5,522
Licenses (Note 10)		3,772			608
Supplier relationships (Note 10)		30,073			4,847
Purchased softwares		360			58

Total assets acquired		511,044			82,366

Accounts and notes payable		(39,293	)		(6,333	)
Other current liabilities		(42,555	)		(6,859	)
Deferred tax liabilities-non-current		(81,657	)		(13,161	)
Other non-current liabilities		(3,372	)		(543	)

Total liabilities assumed		(166,877	)		(26,896	)

Net assets acquired		344,167			55,470
Purchase consideration		953,567			153,687

Goodwill		609,400			98,217

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed


	RMB		US$
Cash consideration (i)		49,554		7,986
Contingent consideration in cash* (ii)		7,339		1,183
Contingent ordinary shares issuance* (ii) (iii)		7,339		1,183

Total fair value of purchase price consideration		64,232		10,352

The Company determined the fair value of the contingent share consideration with the assistance of an independent third party valuation firm.

Details of the purchase consideration are as follows:

RMB49,554 of the above cash consideration was paid in 2014.

ii.

iii.

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed as of the date of acquisition:


	RMB			US$
Current assets		13,472			2,171
Other non-current assets		262			42
Property and equipment, net		15,912			2,565
Licenses		896			144
Supplier Relationship		14,516			2,340
Customer Relationships		9,381			1,512
Non-compete agreements		300			48

Total assets acquired		54,739			8,822

Accounts and notes payable		(5,768	)		(930	)
Other current liabilities		(10,124	)		(1,631	)
Deferred revenue-non-current		(750	)		(121	)
Deferred tax liabilities-non-current		(4,683	)		(755	)

Total liabilities assumed		(21,325	)		(3,437	)

Net assets acquired		33,414			5,386
Purchase consideration		64,232			10,352
Fair value of noncontrolling interests		5,597			902

Goodwill		36,415			5,869

Beijing Yichengtaihe Investment Co., Ltd

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed

As of September 30, 2014, the fair values of the net identifiable assets of BJ Yichengtaihe are as follows:


	RMB			US$
Net assets acquired:
Property		160,974			25,944
Land use right		54,489			8,782
Equipment		25,661			4,136
Cash and cash equivalent		1,098			177
Other current liabilities		(1,008	)		(162	)
Deferred tax liabilities		(42,368	)		(6,828	)

Total consideration in cash		198,846			32,049

Accounts and Notes Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2014

Receivables [Abstract]

Accounts and Notes Receivable and Allowance for Doubtful Accounts

Accounts and notes receivable and the allowance for doubtful accounts consist of the following:


	December 31,
	2013			2014
	RMB			RMB			US$
Accounts receivable		610,960			749,456			120,790
Notes receivable		—			905			146

Allowance for doubtful debts		(547	)		(10,416	)		(1,678	)

		610,413			739,945			119,258

Analysis of Allowance for Doubtful Accounts

An analysis of the allowance for doubtful accounts is as follows:


	December 31,
	2013			2014
	RMB			RMB			US$
Balance at beginning of the year		341			547			88
Provision		502			9,924			1,599
Write-off of accounts receivable		(296	)		(55	)		(9	)

Balance at the end of the year		547			10,416			1,678

Short-Term Investments (Tables)

12 Months Ended

Dec. 31, 2014

Short-Term Investments

Short-term investments consisted of the following as of December 31, 2013 and 2014:


	December 31,
	2013		2014
	RMB		RMB		US$
Held-to-maturity securities
- Fixed rate time deposits		127,023		11,242		1,812
- Floating rate time deposits		74,803		—		—
- Floating rate principal guaranteed investments		900,000		—		—
- Fixed rate principal guaranteed investments		—		900,000		145,054

		1,101,826		911,242		146,866

Inventories (Tables)

12 Months Ended

Dec. 31, 2014

Inventory Disclosure [Abstract]

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]

Inventories consisted of the following as of December 31, 2013 and 2014:

December 31,

2013

2014

RMB

US$

Broadband related products

—

10,059

1,621

Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2014

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:


	December 31,
	2013		2014
	RMB		RMB		US$
Prepaid expenses for bandwidth, rented data centers or cabinets		26,332		66,896		10,782
Staff field advances		3,716		8,453		1,362
Interest receivables		28,404		13,275		2,140
Receivables for the disposal of certain construction-in-progress		20,290		20,290		3,270
Loans to shareholder of BJ Yichengtaihe		24,000		—		—
Tax recoverables		21,345		66,492		10,717
Deposits		10,079		9,793		1,578
Loan to third parties		6,987		48,422		7,804
Other receivables		13,722		75,820		12,216

		154,875		309,441		49,869

Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2014

Property, Plant and Equipment [Abstract]

Property and Equipment Including Those Held under Capital Leases

Property and equipment, including those held under capital leases, consist of the following:


	December 31,
	2013			2014
	RMB			RMB			US$
At cost:
Property		397,389			439,480			70,831
Leasehold improvements		228,101			359,870			58,001
Computer and network equipment		960,029			2,225,419			358,672
Optical fibers		64,700			207,423			33,431
Office equipment		6,717			18,472			2,977
Motor vehicles		1,751			6,893			1,111

		1,658,687			3,257,557			525,023
Less: accumulated depreciation		(429,761	)		(706,111	)		(113,804	)

		1,228,926			2,551,446			411,219
Construction-in-progress		173,251			485,261			78,210

		1,402,177			3,036,707			489,429

Depreciation Expense

Depreciation expense was RMB92,786, RMB141,286 and RMB278,986 (US$44,964) for the years ended December 31, 2012, 2013 and 2014, respectively, and were included in the following captions:


	For the year ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Cost of revenues		69,883		103,002		225,680		36,373
Sales and marketing expenses		814		2,097		3,397		575
General and administrative expenses		2,691		10,271		19,433		3,104
Research and development expenses		19,398		25,916		30,476		4,912

		92,786		141,286		278,986		44,964

Carrying Amounts of Property and Equipment Held under Capital Leases

The carrying amounts of the Company’s property and equipment held under capital leases at respective balance sheet dates were as follows:


	December 31,
	2013			2014
	RMB			RMB			US$
Property		365,353			365,353			58,884
Computer and network equipment		87,896			164,483			26,510
Optical fibers		64,700			207,423			33,431

		517,949			737,259			118,825
Less: accumulated depreciation		(51,935	)		(74,237	)		(11,965	)

		466,014			663,022			106,860

Carrying Amounts of Computer and Network Equipment Pledged to Secure Banking Borrowings

The carrying amounts of computer and network equipment pledged by the Company to secure banking borrowings (Note 14) granted to the Company at the respective balance sheet dates were as follows:


	December 31,
	2013		2014
	RMB		RMB		US$
Property		—		22,921		3,694
Computer and network equipment		94,129		42,115		6,788

Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Intangible Assets

The following table presents the Company’s intangible assets as of the respective balance sheet dates:


	Purchased software			Radio spectrum license			Network use right			Contract backlog*			Customer relationships*			Licenses*			Supplier relationships*			Trade names*			Platform software*			Non-compete agreements*			Favorable contract*			Internal use software			Property management relationship*			Total
	RMB			RMB						RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB
Intangible assets, net January 1, 2013		13,527			115,306			19,833			1,529			37,635			1,213			93,554			13,005			8,307			—			—			—			—			303,909
Additions		13,934			—			—			4,320			27,770			2,160			14,950			—			10,250			1,500			6,500			13,889			—			95,273
Disposals		(42	)		—			—			—			—			—			—			—			—			—			—			—			—			(42	)
Foreign currency translation difference		—			(3,348	)		—			—			—			—			—			—			—			—			—			—						(3,348	)
Amortization expense		(4,646	)		(7,945	)		(999	)		(4,893	)		(12,535	)		(214	)		(15,217	)		(1,020	)		(3,146	)		(250	)		(6,468	)		(1,570	)		—			(58,903	)

Intangible assets, net December 31, 2013		22,773			104,013			18,834			956			52,870			3,159			93,287			11,985			15,411			1,250			32			12,319			—			336,889
Additions		64,778			—			—			34,259			673,227			15,412			68,042			227,014			—			26,970			—			7,199			86,873			1,203,774
Disposals		(8,662	)		—			—			—			—			—			—			—			—			—			—			(1,331	)		—			(9,993	)
Foreign currency translation difference		1,025			427			—			—			—			—			—			—			—			—			—			—			—			1,452
Amortization expense		(12,882	)		(8,560	)		(1,000	)		(3,701	)		(48,666	)		(786	)		(20,325	)		(9,902	)		(3,829	)		(4,022	)		(32	)		(8,333	)		(5,631	)		(127,669	)

Intangible assets, net December 31, 2014		67,032			95,880			17,834			31,514			677,431			17,785			141,004			229,097			11,582			24,198			—			9,854			81,242			1,404,453

Intangible assets, net December 31, 2014 (US$)		10,803			15,453			2,874			5,079			109,182			2,866			22,726			36,924			1,867			3,900			—			1,588			13,095			226,357

*	Acquired in the acquisitions of subsidiaries

Annual Estimated Amortization Expenses of Intangible Assets

The annual estimated amortization expenses for the intangible assets for each of the next five years are as follows:


	RMB		US$
2015		189,106		30,478
2016		171,481		27,638
2017		165,854		26,731
2018		149,625		24,115
2019		139,653		22,508

		815,719		131,470

Land Use Rights (Tables)

12 Months Ended

Dec. 31, 2014

Text Block [Abstract]

Land Use Rights

Land use rights held by the Company are amortized over the remaining term of the respective land use rights certificates.


	December 31,
	2013		2014			2014
	RMB		RMB			US$
Cost		—		66,878			10,778
Accumulated amortization		—		(703	)		(113	)

Land use rights, net		—		66,175			10,665

Goodwill (Tables)

12 Months Ended

Dec. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill were as follows:


	December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Balance as of January 1		217,436		296,688		410,500		66,161
Goodwill acquired		79,252		113,812		1,345,470		216,850

Balance as of December 31		296,688		410,500		1,755,970		283,011

Long-Term Investments (Tables)

12 Months Ended

Dec. 31, 2014

Investment in Equity Investee

Investment in an equity investee

As of December 31, 2012

Increase (decrease)
during the year ended
December 31, 2013

As of December 31, 2013

Cost of
investment

Share
equity loss

Investment
in equity
investee

Cost of
investment

Share
equity loss

Cost of
investment

Share
equity loss

Investment
in equity
investee

RMB

Yizhuang Fund

50,500

(1,101

)

49,399

50,500

(1,372

)

101,000

(2,473

)

98,527

As of December 31, 2013

Increase (decrease)
during the year ended
December 31, 2014

As of December 31, 2014

Cost of
investment

Share
equity loss

Investment
in equity
investee

Cost of
investment

Share
equity loss

Cost of
investment

Share
equity loss

Investment
in equity
investee

RMB

US$

Yizhuang Fund

101,000

(2,473

)

98,527

—

(671

)

101,000

(3,144

)

97,856

15,772

Bonds Payable (Tables)

12 Months Ended

Dec. 31, 2014

Debt Disclosure [Abstract]

Summary of Bank and Other Borrowings

Bank and other borrowings are as follows as of the respective balance sheet dates:


	December 31,
	2013		2014		2014
	(RMB)		(RMB)		(US$)
Short-term bank borrowings		173,726		160,181		25,816
Long-term bank borrowings, current portion		197,000		55,647		8,968
Other long-term borrowings, current portion		—		900,000		145,054

		370,726		1,115,828		179,838

Long-term bank borrowings, non-current portion		65,740		61,673		9,940
Other long-term borrowings, non-current portion		900,000		—		—

		965,740		61,673		9,940

Total bank and other borrowings		1,336,466		1,177,501		189,779

Secured or Guaranteed Short Term Bank Borrowings

Bank and other borrowings as of December 31, 2013 and 2014 were secured/guaranteed by the following:

December 31, 2013


Short-term bank borrowings		Secured/guaranteed by
(RMB)
	19,085	Guaranteed by restricted cash of RMB2,099.
	30,000	Secured by a subsidiary’s computer and network equipment with net book value of RMB46,631 (Note 9).
	40,000	Jointly guaranteed by Mr. Chen Sheng, Director and CEO of the Company and Mr. Zhang Jun, the former Director and COO of the Company.
	84,641	Unsecured borrowings.

	173,726


Long-term bank and other borrowings (including current portion)		Secured/guaranteed by
(RMB)
	19,740	Jointly guaranteed by the Company’s computer and network equipment with net book value of RMB47,498 (Note 9).
	63,000	Guaranteed by restricted cash of RMB100,000.
	180,000	Guaranteed by restricted cash of RMB190,000.
	900,000	Secured by the pledged dividend right and the right to sell or transfer the 90% equity interest of Asia Cloud Investment held by 21Vianet Technology (Note 1(c)).

	1,162,740

December 31, 2014


Short-term bank borrowings		Secured/guaranteed by
(RMB)
	9,181	Guaranteed by restricted cash of RMB1,885.
	11,000	Secured by a subsidiary’s building with net book value of RMB14,298 (Note 9).
	140,000	Unsecured borrowings.

	160,181


Long-term bank and other borrowings (including current portion)		Secured/guaranteed by
(RMB)
	2,090	Jointly guaranteed by (i) the ultimate controlling shareholder of Dermot Entities and Upwise Investments Limited, the seller of Dermot Entities; (ii) restricted cash of HK$1,500.
	8,000	Secured by a subsidiary’s building with net book value of RMB8,623 (Note 9).
	18,753	Secured by a subsidiary’s computer and network equipment with net book value of RMB42,115 (Note 9).
	50,000	Guaranteed by restricted cash of RMB100,000.
	900,000	Secured by the pledged dividend right and the right to sell or transfer the 90% equity interest of Asia Cloud Investment held by 21Vianet Technology (Note 1(c)).
	38,477	Unsecured borrowings.

	1,017,320

Repayments of Principal Amounts of Long-Term Borrowings, Including Bonds Payable, Bank and Other Borrowings


	RMB		US$
For the years ending December 31,
2015		1,055,648		170,139
2016		280,554		45,217
2017		2,016,628		325,021
2018		18,976		3,058
2019		9,814		1,582
Thereafter		—		—

Accrued Expenses And Other Payables (Tables)

12 Months Ended

Dec. 31, 2014

Payables and Accruals [Abstract]

Components of Accrued Expenses and Other Payables

The components of accrued expenses and other payables are as follows:


	December 31,
	2013		2014
	RMB		RMB		US$
Payroll and welfare payables		28,693		178,295		28,736
Business and other taxes payable		67,408		16,633		2,681
Payables for office supplies and utilities		3,650		8,782		1,415
Payables for the purchase of property and equipment		85,993		233,353		37,610
Payable for purchase intangible assets		10,000		5,054		815
Accrued service fees		37,130		60,167		9,697
Interest payables		36,254		20,452		3,296
Share-settled bonuses		6,441		14,913		2,404
Payable for assets acquisition		—		35,846		5,777
Others		16,852		25,996		4,189

		292,421		599,491		96,620

Capital Leases (Tables)

12 Months Ended

Dec. 31, 2014

Leases [Abstract]

Future Minimum Lease Payments Under Non Cancellable Capital Lease Arrangements

Future minimum lease payments under non-cancellable capital lease arrangements as lessee are as follows:


	RMB			US$
2015		120,919			19,489
2016		93,107			15,006
2017		117,797			18,985
2018		81,498			13,135
2019 and thereafter		782,823			126,168

Total minimum lease payments		1,196,144			192,783
Less: amount representing interest		(612,526	)		(98,721	)

Present value of remaining minimum lease payments		583,618			94,062

Deferred Government Grants (Tables)

12 Months Ended

Dec. 31, 2014

Deferred Revenue Disclosure [Abstract]

Movements of Deferred Government Grants

Movements of deferred government grants are as follows:


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Balance at beginning of the year		5,819			18,793			18,046			2,908
Additions		15,850			2,950			20,920			3,372
Recognized in income as a reduction of depreciation expense		(2,876	)		(3,697	)		(5,394	)		(869	)

Balance at end of the year		18,793			18,046			33,572			5,411

Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2014

Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax of Nil

The changes in accumulated other comprehensive income (loss) by component, net of tax of nil, are as follows:


	Foreign currency translation			Total
	RMB			RMB
Balance as of January 1, 2012		(54,779	)		(54,779	)
Current year other comprehensive loss		(2,588	)		(2,588	)

Balance as of December 31, 2012		(57,367	)		(57,367	)
Current year other comprehensive loss		(25,222	)		(25,222	)

Balance as of December 31, 2013		(82,589	)		(82,589	)
Current year other comprehensive income		16,835			16,835

Balance as of December 31, 2014		(65,754	)		(65,754	)

Balance as of December 31, 2014, in US$		(10,598	)		(10,598	)

Share Based Compensation (Tables)

12 Months Ended

Dec. 31, 2014

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of Employee Share Option Activity Under Twenty Ten Plan

The following table summarized the Company’s employee share option activity under the 2010 Plan:


	Number of options			Weighted average exercise price		Weighted average remaining contractual term		Aggregate intrinsic value
				(US$)		(Years)		(US$)
Outstanding, January 1, 2014		10,958,796			0.31		6.7		39,546
Exercised		(1,828,910	)		0.26
Forfeited		(75,768	)		0.54

Outstanding, December 31, 2014		9,054,118			0.32		6.3		20,450

Vested and expected to vest at December 31, 2014		9,054,118			0.32		6.3		20,450

Exercisable as of December 31, 2014		7,837,941			0.25		6.2		18,225

Assumptions Used to Calculate Grant Date Estimated Fair Value of Share Options Using Black Scholes Option Valuation Model or Binomial Lattice Model


	Granted in 2011	Granted in 2011	Granted in 2012
	Before September 30, 2011	After September 30, 2011
Risk-free interest rates	1.03%-3.36%	1.03%-3.36%	2.06%-3.68%
Expected life (years)	0.08-7.75 years	Not applicable	Not applicable
Sub optimal early exercise factor	Not applicable	2.2	2.2
Expected volatility	24.25%-76%	69.17%	57.01%-68.03%
Expected dividend yield	0%	0%	0%
Fair value of share option	US$1.20-US$2.06	US$1.02-US$1.03	US$1.34-US$1.68

Restricted Stock Units Activity

The following table summarizes the Company’s RSUs activity under the 2010 Plan and 2014 Plan:


	Number of RSUs			Weighted-average grant date fair value		Weighted-average remaining contractual life		Aggregate intrinsic value
				(US$)		(Years)		(US$)
Unvested, January 1, 2014		1,176,611			12.52		9.0		27,674
Granted		3,196,373			23.27
Vested		(677,570	)		14.42
Forfeited		(85,158	)		12.56

Unvested, December 31, 2014		3,610,256			19.22		8.6		55,851

Total Compensation Expense Recognized Relating to Options Granted to Employees

Total compensation expense relating to share options and RSUs granted to employees recognized for the years ended December 31, 2012, 2013 and 2014 is as follows:


	For the year ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Cost of revenues		4,517		8,054		7,163		1,154
Sales and marketing expenses		10,508		13,405		13,482		2,173
General and administrative expenses		47,749		40,711		208,914		33,671
Research and development expenses		4,858		5,599		4,176		673

		67,632		67,769		233,735		37,671

Taxation (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Profit or Loss Before Income Taxes

Profit (loss) before income taxes consists of:


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Non-PRC		(74,140	)		(165,039	)		(485,539	)		(78,255	)
PRC		167,955			128,360			173,735			28,000

		93,815			(36,679	)		(311,804	)		(50,255	)

Income Tax Expense

Income tax expense comprises of:


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Current		(45,481	)		(29,905	)		(45,401	)		(7,317	)
Deferred		9,322			19,581			28,728			4,630

		(36,159	)		(10,324	)		(16,673	)		(2,687	)

Reconciliation Tax Computed Applying Statutory Income Tax Rate


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Profit (loss) before income taxes		93,815			(36,679	)		(311,804	)		(50,255	)

Income tax (expense) benefit computed at applicable tax rates (25%)		(23,454	)		9,170			77,951			12,563
Non-deductible expenses		(1,969	)		(3,385	)		(6,095	)		(980	)
Research and development expenses		4,313			6,850			6,879			1,109
Effect of tax holidays		—			10,487			6,305			1,016
Preferential rate		7,245			2,655			20,049			3,231
Current and deferred tax rate differences		1,804			11,938			(8,553	)		(1,379	)
International rate differences		(15,716	)		(36,080	)		(108,066	)		(17,417	)
Tax exempted income		2,635			(905	)		2,118			341
Unrecognized tax benefits		(641	)		(6,719	)		3,872			624
Deferred tax expense		(3,695	)		(7,882	)		(3,109	)		(501	)
Change in valuation allowance		(5,263	)		1,172			(7,704	)		(1,242	)
Prior year provision to return true up		(1,418	)		2,375			(320	)		(52	)

Income tax expense		(36,159	)		(10,324	)		(16,673	)		(2,687	)

Tax Holiday Benefit Per Basic and Diluted Earnings Per Share

The benefit of the tax holiday per basic and diluted earnings per share is as follows:


	For the year ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Basic		—		0.029		0.016		0.003

Diluted		—		0.029		0.016		0.003

Significant Components of Deferred Taxes

The significant components of deferred taxes are as follows:


	December 31,
	2013			2014
	RMB			RMB			US$
Deferred tax assets
Current
Allowance for doubtful accounts		147			1,523			245
Accrued salary and welfare		6,784			30,226			4,872
Accrued expenses		4,415			2,302			371
Contingent consideration payables		2,984			—			—
Property and equipment		—			1,424			229
Deferred government grant-current		153			74			12
Valuation allowance		(387	)		(547	)		(88	)

Net current deferred tax assets		14,096			35,002			5,641

Non-current
Tax losses		7,606			18,787			3,027
Property and equipment		9,947			15,428			2,487
Intangible assets		—			936			151
Capital lease		3,720			8,717			1,405
Deferred government grant-non-current		4,202			6,234			1,005
Depreciation and amortization generated from acquisitions		740			8,361			1,348
Valuation allowance		(8,346	)		(15,890	)		(2,561	)

Net non-current deferred tax assets		17,869			42,573			6,862

Total deferred tax assets		31,965			77,575			12,503

Deferred tax liabilities
Current
Accrued interest income		3,115			2,696			435

Non-current
Intangible assets		45,770			235,346			37,933
Property and equipment		28,245			69,896			11,265
Capitalized interest expense		4,578			5,098			820

Net non-current deferred tax liabilities		78,593			310,340			50,018

Total deferred tax liabilities		81,708			313,036			50,453

Unrecognized Tax Benefits

A roll-forward of unrecognized tax benefits is as follows:


	For the year ended December 31,
	2013			2014
	RMB			RMB			US$
Balance at beginning of year		10,302			14,232			2,294
Reversal based on tax positions related to prior years		(500	)		(5,948	)		(959	)
Additions based on tax positions related to the current year		4,430			8,398			1,354

Balance at end of year		14,232			16,682			2,689

Parent Company Only Condensed Financial Information (Tables)

12 Months Ended

Dec. 31, 2014

Related Party Transactions

The Company had the following related party transactions for the years ended December 31, 2012, 2013 and 2014:


	For the year ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Services provided to:
- Upwise		—		—		143		23
- DCS		—		—		18		3
- CE BJ		1		—		—		—
- CE Soft BJ		215		—		—		—
Services provided by:
- DIC		—		—		4,106		662
- DCS		—		—		587		95
- Upwise		—		—		97		16
- Xi’an Tech		5,526		—		—		—
Purchases of equipment from:
- SZ Aizhuoyi		—		61,202		80,059		12,903
- DCS		—		—		330		53
- ABC		—		266		—		—
- CE Soft BJ		515		—		—		—
Loans provided to:
- Seller of Aipu Group		—		—		98,500		15,875
- BitCool Media		14,771		19,096		22,792		3,673
- SH Shibei		—		4,900		—		—
- Seller of iJoy		—		12,193		—		—
Repayment of loans:
- BitCool Media		—		1,219		35,380		5,702
Receipt of interest income from loan to:
- Bitcool Media		—		—		1,553		250
Interest income from loan to:
- Bitcool Media		253		861		956		154
Management service provided by:
- DCS		—		—		8,949		1,442
Acquisition of 21V Xi’an from 21 Vianet Infrastructure Limited		15,977		—		—		—

Parent Company

Related Party Transactions

(b)

Related party transactions

The Company had the following related party balances as of December 31, 2013 and 2014:


	December 31,
	2013		2014
	RMB		RMB		US$
Amount due from subsidiaries
- 21Vianet HK		1,581,289		2,056,545		331,455
- 21Vianet Beijing		91,042		1,726		278
- Xi’an Holding		4		6,123		987
- Venture		—		14,074		2,268

		1,672,335		2,078,468		334,988

Amount due from related parties
Current:
- Seller of iJoy		24,387		24,476		3,945

Non-current:
- Seller of Aipu Group		—		70,000		11,282

Amount due to related parties
Current:
- Seller of Tianwang and Yilong		19,605		2,970		479
- Seller of iJoy		63,602		50,506		8,140
- Seller of GD Tianying		—		9,434		1,520
- Seller of Dermot Entities		—		205,380		33,101
- Seller of Gehua		16,737		—		—

		99,944		268,290		43,240

Non-current:
- Sellers of Tianying		—		17,585		2,834
- Seller of Aipu Group		—		67,531		10,884
- Seller of Dermot Entities		—		177,220		28,563
- Seller of iJoy		58,487		18,392		2,964
- Seller of Tianwang and Yilong		19,834		—		—

		78,321		280,728		45,245

Condensed Balance Sheets

Condensed balance sheets


	Note	As of December 31,
		2013			2014
		RMB			RMB			US$
ASSETS
Current assets
Cash			590,682			3,891			627
Restricted cash			190,000			100,000			16,117
Short-term investments			81,826			11,242			1,812
Prepaid expenses and other current assets			76,606			52,989			8,538
Amount due from a related party	(b)		24,387			24,476			3,945
Amount due from subsidiaries	(b)		1,672,335			2,078,468			334,988

Total current assets			2,635,836			2,271,066			366,027

Non-current assets
Restricted cash			100,000			—			—
Investments in subsidiaries			895,390			2,659,202			428,586
Amount due from a related party	(b)		—			70,000			11,282
Other non-current assets			26,116			27,900			4,497

Total non-current assets			1,021,506			2,757,102			444,365

Total assets			3,657,342			5,028,168			810,392

LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accrued expenses and other payables			255			4,772			769
Interest payable			21,265			7,390			1,191
Amount due to related parties	(b)		99,944			268,290			43,240

Total current liabilities			121,464			280,452			45,200

Non-current liabilities
Amount due to related parties	(b)		78,321			280,728			45,245
Bonds payable	(d)		998,505			2,264,064			364,901

Total non-current liabilities			1,076,826			2,544,792			410,146

Total liabilities			1,198,290			2,825,244			455,346

Shareholders’ equity:
Class A Ordinary shares (par value of US$0.00001 per share; 470,000,000 and 1,200,000,000 shares authorized; 344,745,991 and 346,803,765 shares issued and outstanding as of December 31, 2013 and 2014, respectively)			22			23			3
Class B Ordinary shares (par value of US$0.00001 per share; 300,000,000 and 300,000,000 shares authorized; 53,480,544 and 49,430,544 shares issued and outstanding as of December 31, 2013 and 2014, respectively)			4			3			1
Additional paid-in capital			3,836,967			4,117,232			663,577
Accumulated other comprehensive loss			(82,589	)		(65,754	)		(10,598	)
Accumulated deficit			(1,286,435	)		(1,634,915	)		(263,500	)
Treasury stock			(8,917	)		(213,665	)		(34,437	)

Total shareholders’ equity			2,459,052			2,202,924			355,046

Total liabilities and shareholders’ equity			3,657,342			5,028,168			810,392

Condensed Statements of Operations

Condensed statements of operations


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Operating Expenses
General and administrative expenses		(78,611	)		(16,741	)		(125,859	)		(20,286	)
Changes in the fair value of contingent purchase consideration payables		5,693			(99,874	)		(22,629	)		(3,647	)

Operating loss		(72,918	)		(116,615	)		(148,488	)		(23,933	)
Other income (expense)		10,570			(41,475	)		(199,418	)		(32,140	)
Share of profits (losses) from subsidiaries and Consolidated VIEs		118,672			109,864			(574	)		(93	)

Profit (loss) before income taxes		56,324			(48,226	)		(348,480	)		(56,166	)
Income tax expense		—			—			—			—

Net profit (loss)		56,324			(48,226	)		(348,480	)		(56,166	)

Condensed Statements of Comprehensive Income (Loss)

Condensed statements of comprehensive income (loss)


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Net profit (loss)		56,324			(48,226	)		(348,480	)		(56,166	)
Other comprehensive (loss) income, net of tax of nil:
Foreign currency translation adjustments, net of tax of nil		(3,942	)		(21,357	)		16,835			2,713

Other comprehensive income (loss), net of tax of nil:
Comprehensive income (loss)		52,382			(69,583	)		(331,645	)		(53,453	)

Comprehensive income (loss) attributable to the Company’s ordinary shareholders		52,382			(69,583	)		(331,645	)		(53,453	)

Condensed Statements of Cash Flows

Condensed statements of cash flows


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
Net cash used in operating activities		(6,300	)		(26,630	)		(23,952	)		(3,860	)
Net cash generated from (used in) investing activities		272,873			(67,455	)		(1,186,053	)		(191,158	)
Net cash (used in) generated from financing activities		(286,700	)		670,670			623,214			100,444

Net (decrease) increase in cash		(20,127	)		576,585			(586,791	)		(94,574	)
Cash at beginning of the year		34,224			14,097			590,682			95,201

Cash at end of the year		14,097			590,682			3,891			627

Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2014

Related Party Balances

The Company had the following related party balances as of December 31, 2013 and 2014:


	December 31,
	2013		2014
	RMB		RMB		US$
Amounts due from related parties:
Current:
- Bitcool Media		33,311		20,126		3,244
- Seller of iJoy		24,387		24,476		3,945
- SH Shibei		9,800		9,800		1,579
- Upwise		—		465		75

		67,498		54,867		8,843

Non-current:
- Seller of Aipu Group		—		98,500		15,875

Amounts due to related parties:
Current:
- Seller of the Managed Network Entities		47,755		47,755		7,697
- Seller of iJoy		63,602		50,506		8,140
- Seller of Tianwang and Yilong		19,605		2,970		479
- Seller of GD Tianying		—		9,434		1,520
- Sellers of Dermot Entities		—		205,380		33,101
- SZ Aizhuoyi		—		7,131		1,149
- DCS		—		3,628		585
- Seller of Gehua		16,737		—		—

		147,699		326,804		52,671


	December 31,
	2013		2014
	RMB		RMB		US$
Non-current:
- Seller of iJoy		58,487		18,392		2,964
- Seller of Tianying		—		17,585		2,834
- Sellers of Aipu Group		—		67,531		10,884
- Seller of Dermot Entities		—		177,220		28,563
- Seller of Tianwang and Yilong		19,834		—		—

		78,321		280,728		45,245

Earnings (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2014

Earnings Per Share [Abstract]

Basic and Diluted Earnings (Loss) Per Share

Basic and diluted earnings (loss) per share for each of the years presented are calculated as follows:


	For the year ended December 31,
	2012			2013			2014
	RMB			RMB			RMB			US$
*Numerator:*
Net profit (loss)		57,656			(47,003	)		(328,477	)		(52,942	)
Less: net profit attributable to noncontrolling interest and redeemable noncontrolling interest		(1,332	)		(1,223	)		(20,003	)		(3,224	)

Net profit (loss) attributable to ordinary shareholders		56,324			(48,226	)		(348,480	)		(56,166	)
Plus: deemed dividend in relation to accretion of redeemable noncontrolling interests		—			—			(7,850	)		(1,265	)

Adjusted net profit (loss) attributable to ordinary shareholders		56,324			(48,226	)		(356,330	)		(57,431	)

*Denominator:*

Weighted-average number of shares outstanding—basic		342,533,167			364,353,974			401,335,788			401,335,788
Weighted-average number of stock options and RSUs granted in connection with the stock option plan		14,251,042			—			—			—

Weighted-average number of shares outstanding—diluted		356,784,209			364,353,974			401,335,788			401,335,788

Earnings (loss) per share—Basic:
Net profit (loss)		0.16			(0.13	)		(0.89	)		(0.14	)

		0.16			(0.13	)		(0.89	)		(0.14	)

Earnings (loss) per share—Diluted:
Net profit (loss)		0.16			(0.13	)		(0.89	)		(0.14	)

		0.16			(0.13	)		(0.89	)		(0.14	)

Redeemable Noncontrolling Interests (Tables)

12 Months Ended

Dec. 31, 2014

Noncontrolling Interest [Abstract]

Redeemable Non Controlling Interests


	For the year ended December 31,
	2012		2013		2014
	RMB		RMB		RMB		US$
Balance as of January 1		—		—		—		—
Acquisition of Aipu Group (Note 4)		—		—		748,040		120,562
Current profit		—		—		17,816		2,872
Accretion of redeemable noncontrolling interests		—		—		7,850		1,265

Balance as of December 31		—		—		773,706		124,699

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2014

Fair Value Disclosures [Abstract]

Assets and Liabilities Measured at Fair Value on Recurring Basis

Assets and liabilities measured at fair value on a recurring basis are summarized below:


	Fair value measurement using:
	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Unobservable inputs (Level 3)		Fair value at December 31, 2013
	RMB		RMB		RMB		RMB
Cash equivalents:
- Fixed rate time deposits		821,718		—		—		821,718

Held-to-maturity short-term investments:
- Fixed rate time deposits		127,023		—		—		127,023
- Floating rate time deposits		74,803		—		—		74,803
- Floating rate principal guaranteed investments		—		900,000		—		900,000

Assets		1,023,544		900,000		—		1,923,544

Long-term borrowings:
- Bonds payable		1,027,140		—		—		1,027,140

Other liabilities:
- Share-settled bonuses		—		—		6,441		6,441
- Mandatorily redeemable noncontrolling interests in Asia Cloud Investment		—		—		100,000		100,000

Amounts due to related parties:
- Contingent consideration payable in relation to the acquisition of subsidiaries		—		—		178,265		178,265

Liabilities		1,027,140		—		284,706		1,311,846


	Fair value measurement using:
	Quoted prices in active markets for identical assets (Level 1)		Significant other observable inputs (Level 2)		Unobservable inputs (Level 3)		Fair value at December 31, 2014
	RMB		RMB		RMB		RMB		US$
Cash equivalents:
- Fixed rate time deposits		116,677		—		—		116,677		18,805

Held-to-maturity short-term investments:
- Fixed rate time deposits		11,242		—		—		11,242		1,812
- Fixed rate principal guaranteed investments		—		900,000		—		900,000		145,054

Assets		127,919		900,000		—		1,027,919		165,671

Long-term borrowings:
- Bonds payable		2,211,274		—		—		2,211,274		356,393

Other liabilities:
- Share-settled bonuses		—		—		14,913		14,913		2,404
- Mandatorily redeemable noncontrolling interests in Asia Cloud Investment		—		—		100,000		100,000		16,117

Amounts due to related parties:
- Contingent consideration payable in relation to the acquisition of subsidiaries		—		—		548,017		548,017		88,324

Liabilities		2,211,274				662,930		2,874,204		463,238

Reconciliation of Liabilities Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs Level Three

The following table presents a reconciliation of all liabilities measured at fair value on a recurring basis using significant unobservable inputs (level 3):


	Contingent consideration payable
	RMB
Fair value at January 1, 2013		142,783
Contingent purchase consideration payable — Tianwang and Yilong (Note 4)		55,889
Contingent purchase consideration payable — iJoy (Note 4)		72,294
Changes in the fair value		55,882
Payment of cash consideration		(22,868	)
Reclassification to equity upon resolution of contingencies		(125,715	)

Transfers in and/or out of Level 3		—
Fair value at December 31, 2013		178,265

Contingent purchase consideration payable — Aipu Group (Note 4)		48,971
Contingent purchase consideration payable — Dermot Entities (Note 4)		355,067
Contingent purchase consideration payable — Other acquisitions (Note 4)		14,678
Changes in the fair value		22,629
Payment of cash consideration		(4,870	)
Reclassification to equity upon resolution of contingencies		(66,280	)
Foreign exchange gain/(loss) generate from payment of cash consideration		(443	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2014		548,017

Fair value at December 31, 2014 (US$)		88,324


	Share-settled bonuses
	RMB
Fair value at January 1, 2013		—
Increase in bonuses settled in shares during 2013		5,894
Changes in the fair value		4,566
Reclassification to equity		(1,564	)
Reclassification to “Accrued expenses and other payables-Others”		(2,455	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2013		6,441

Increase in bonuses settled in shares during 2014		14,862
Changes in the fair value		9,141
Reclassification to equity		(15,454	)
Reclassification to “Accrued expenses and other payables-Others”		(77	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2014		14,913

Fair value at December 31, 2014 (US$)		2,404


	Mandatorily redeemable noncontrolling interests in Asia Cloud Investment
	RMB
Fair value at January 1, 2014		100,000
Changes in the fair value		—
Transfers in and/or out of Level 3		—

Fair value at December 31, 2014		100,000

Fair value at December 31, 2014 (US$)		16,117

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2014

Future Minimum Lease Payments Under Non Cancelable Operating Leases


	RMB		US$
2015		87,699		14,135
2016		78,811		12,702
2017		74,166		11,953
2018		36,318		5,853
2019 and thereafter		149,585		24,109

		426,579		68,752

Computer and Network Equipment and Construction in Progress

Purchase Commitments

As of December 31, 2014, the Company has the following commitments to purchase certain computer and network equipment and construction in progress:


	RMB		US$
2015		484,106		78,024
2016		334		54

		484,440		78,078

Bandwidth and Cabinet Capacity

Purchase Commitments

As of December 31, 2014, the Company had outstanding purchase commitments in relation to bandwidth and cabinet capacity consisting of the following:


	RMB		US$
2015		958,188		154,432
2016		75,800		12,217
2017		39,432		6,355
2018		29,556		4,764
2019 and thereafter		125,825		20,279

		1,228,801		198,047

Summary of Company Subsidiaries and Its Consolidated Variable Interest Entities (Detail)

12 Months Ended

Dec. 31, 2014

21ViaNet Group Limited ("21Vianet HK") | Subsidiaries

May 25, 2007

Hong Kong

100.00%

21Vianet Data Center Co., Ltd. ("21Vianet China") | Subsidiaries

Investment holding

Jun. 12, 2000

^[1]

PRC

^[1]

100.00%

^[1]

Fastweb International Holdings ("Fastweb Holdings") | Subsidiaries

Provision of technical and consultation services and rental of long-lived assets

^[1]

Sep. 09, 2012

^[2]

Cayman Islands

^[2]

100.00%

^[2]

Hongkong Fastweb Holdings Co., Limited ("Fastweb HK") | Subsidiaries

Investment holding

^[2]

Sep. 09, 2012

^[2]

Hong Kong

^[2]

100.00%

^[2]

Beijing Fastweb Technology Co., Ltd. ("Fastweb Technology") | Subsidiaries

Investment holding

^[2]

Sep. 09, 2012

^[1],[2]

PRC

^[1],[2]

100.00%

^[1],[2]

21Vianet (Foshan) Technology Co., Ltd. ("FS Technology") | Subsidiaries

Dormant company

^[1],[2]

Dec. 20, 2011

^[1]

PRC

^[1]

100.00%

^[1]

21Vianet Anhui Suzhou Technology Co., Ltd.("SZ Technology") | Subsidiaries

Trading of network equipment, provision of technical and internet data center services

^[1]

Nov. 16, 2011

^[1]

PRC

^[1]

100.00%

^[1]

21Vianet Hangzhou Information Technology Co.,Ltd. ("HZ Technology") | Subsidiaries

Trading of network equipment

^[1]

Mar. 04, 2013

^[1]

PRC

^[1]

100.00%

^[1]

21Vianet Mobile Limited ("21V Mobile") | Subsidiaries

Dormant company

^[1]

Apr. 30, 2013

^[3]

Hong Kong

^[3]

100.00%

^[3]

Joytone Infotech Co., Ltd. ("SZ Zhuoaiyi") | Subsidiaries

Investment holding

^[3]

Apr. 30, 2013

^[1],[3]

PRC

^[1],[3]

100.00%

^[1],[3]

Abitcool (China) Broadband Inc. ("aBitCool DG") | Subsidiaries

Provision of technical and consultation services

^[1],[3]

Jun. 13, 2014

^[1]

PRC

^[1]

100.00%

^[1]

WiFire Group Inc. ("WiFire Group") | Subsidiaries

Provision of telecommunication services

^[1]

Mar. 07, 2014

British Virgin Islands

100.00%

Diyixian.com Limited ("Diyixian.com") | Subsidiaries

Investment holding

Aug. 10, 2014

^[4]

Hong Kong

^[4]

100.00%

^[4]

Dermot Holding Limited ("Dermot BVI") | Subsidiaries

Provision of virtual private networks services

^[4]

Aug. 10, 2014

^[4]

British Virgin Islands

^[4]

100.00%

^[4]

Beijing Yiyun Network Technology Co., Ltd. (formerly known as Beijing aBitCool Network Technology Co., Ltd.) ("21Vianet Technology") | Variable Interest Entities

Investment holding

^[4]

Oct. 22, 2002

^[1],[5]

PRC

^[1],[5]

0.00%

^[1],[5]

Beijing iJoy Information Technology Co., Ltd. ("BJ iJoy") | Variable Interest Entities

Provision of internet data center and managed network services

^[1],[5]

Apr. 30, 2013

^[1],[3],[5]

PRC

^[1],[3],[5]

0.00%

^[1],[3],[5]

aBitCool Small Micro Network Technology (BJ) Co., Ltd. ("aBitCool BJ) | Variable Interest Entities

Provision of internet data center, content delivery network services

^[1],[3],[5]

Apr. 01, 2014

^[1],[5]

PRC

^[1],[5]

0.00%

^[1],[5]

Shanghai iJoy Information Technology Co., Ltd. ("SH iJoy") | Variable Interest Entities | Held directly by BJ iJoy

Provision of telecommunication services

^[1],[5]

May 30, 2013

^[1],[3],[5]

PRC

^[1],[3],[5]

0.00%

^[1],[3],[5]

Shanghai Guotong Network Co., Ltd. ("SH Guotong") | Variable Interest Entities | Held directly by aBitCool BJ

Provision of internet data center, content delivery network services

^[1],[3],[5]

Jul. 31, 2014

^[1],[5],[6]

PRC

^[1],[5],[6]

0.00%

^[1],[5],[6]

Beijing 21ViaNet Broadband Data Center Co., Ltd ("21Vianet Beijing") | Variable Interest Entities | Held Directly by 21 Vianet Technology

Provision of content delivery network services

^[1],[5],[6]

Mar. 15, 2006

^[1],[5]

PRC

^[1],[5]

0.00%

^[1],[5]

Dongguan Asia Cloud Investment Co. Ltd. ("Asia Cloud Investment") | Variable Interest Entities | Held Directly by 21 Vianet Technology

Provision of internet data center and managed network services

^[1],[5]

Jul. 30, 2013

^[1],[5],[7]

PRC

^[1],[5],[7]

0.00%

^[1],[5],[7]

Dongguan Asia Cloud Network Technology Co., Ltd. ("Asia Cloud Technology") | Variable Interest Entities | Held Directly By Asia Cloud Investment

Investment holding

^[1],[5],[7]

Aug. 16, 2013

^[1],[5],[7]

PRC

^[1],[5],[7]

0.00%

^[1],[5],[7]

Beijing Chengyishidai Network Technology Co., Ltd. ("CYSD") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Dormant company

^[1],[5],[7]

Sep. 30, 2010

^[1],[5],[8]

PRC

^[1],[5],[8]

0.00%

^[1],[5],[8]

Zhiboxintong (Beijing) Network Technology Co., Ltd. ("ZBXT") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of managed network services

^[1],[5],[8]

Sep. 30, 2010

^[1],[5],[8]

PRC

^[1],[5],[8]

0.00%

^[1],[5],[8]

Guangzhou Gehua Network Technology and Development Co., Ltd. ("Gehua") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of managed network services

^[1],[5],[8]

Oct. 08, 2011

^[1],[5]

PRC

^[1],[5]

0.00%

^[1],[5]

Langfang Xunchi Computer Data Processing Co., Ltd. ("LF Xunchi") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of managed network services

^[1],[5]

Dec. 19, 2011

^[1],[5]

PRC

^[1],[5]

0.00%

^[1],[5]

Beijing Fastweb Network Technology Co., Ltd. ("BJ Fastweb") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Dormant company

^[1],[5]

Sep. 09, 2012

^[1],[2],[5]

PRC

^[1],[2],[5]

0.00%

^[1],[2],[5]

Shanghai Blue Cloud Technology Co., Ltd. ("SH Blue Cloud") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of internet data center and internet content delivery network services

^[1],[2],[5]

Mar. 21, 2013

^[1],[5]

PRC

^[1],[5]

0.00%

^[1],[5]

Beijing Tianwang Online Communication Technology Co., Ltd. ("BJ Tianwang") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of Office 365 and Windows Azure platform services

^[1],[5]

Feb. 28, 2013

^[1],[5],[9]

PRC

^[1],[5],[9]

0.00%

^[1],[5],[9]

Beijng Yilong Technology Co., Ltd. ("BJ Yilong") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of managed network services and virtual private network services

^[1],[5],[9]

Feb. 28, 2013

^[1],[5],[9]

PRC

^[1],[5],[9]

0.00%

^[1],[5],[9]

Beijing Yichengtaihe Investment Co., Ltd | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of managed network services and virtual private network services

^[1],[5],[9]

Sep. 30, 2014

^[1],[5],[10]

PRC

^[1],[5],[10]

0.00%

^[1],[5],[10]

Sichuan Aipu Network Co., Ltd. ("SC Aipu") | Variable Interest Entities | Held Directly By LF Xunchi

Dormant Company

^[1],[5],[10]

May 31, 2014

^[1],[5],[11]

PRC

^[1],[5],[11]

0.00%

^[1],[5],[11]

DYXnet Limited ("DYXnet") | Variable Interest Entities | Held directly by DYX

Provision of community network services and business network services

^[1],[5],[11]

Aug. 10, 2014

^[4]

Hong Kong

^[4]

100.00%

^[4]

Shenzhen Diyixian Communication Co., Ltd. ("SZ DYX") | Variable Interest Entities | Held by DYX and LF Xunch

Dormant company

^[4]

Aug. 10, 2014

^[1],[4]

PRC

^[1],[4]

50.00%

^[1],[4]

Cash and cash equivalents

Provision of virtual private network services

^[1],[4]

[1]	Collectively, the "PRC Subsidiaries".
[2]	On September 9, 2012, the Company and its subsidiary, 21Vianet Beijing, acquired 100% equity interest in Fastweb Holding and its subsidiaries (collectively referred to as "Fastweb") (Note 4).
[3]	On April 30, 2013, the Company acquired 100% equity interest in 21V Mobile and its subsidiaries (collectively referred to as "iJoy") (Note 4).
[4]	On August 10, 2014, the Company and its subsidiary, LF Xunchi, acquired 100% equity interest Dermot BVI and its subsidiaries (collectively referred to as "Dermot Entities") (Note 4).
[5]	Collectively, the "Consolidated VIEs".
[6]	On August 1, 2014, the Company through its subsidiary, aBitCool BJ acquired 100% equity interest in the entity.
[7]	On July 30, 2013, the Company through 21Vianet Technology, and a state-owned entity established these entities for future operations of telecommunication related services (collectively referred to as "Asia Cloud Group") (Note 1(c)).
[8]	On September 30, 2014, the Company through its subsidiary, 21Vianet Beijing acquired CYSD, ZBXT and its subsidiaries (collectively, the "Managed Network Entities").
[9]	On February 28, 2013, the Company through its wholly-owned subsidiary, 21Vianet Beijing, acquired 100% equity interests in BJ Tianwang and BJ Yilong. (collectively referred to as "Tianwang and Yilong") (Note 4).
[10]	On September 30, 2014, the Company through its subsidiary, 21Vianet Beijing acquired 100% equity interest in the entity, which was accounted for an asset acquisition (Note 4).
[11]	On May 31, 2014, the Company and its subsidiary, Langfang Xunchi Computer Data Processing Co., Ltd. ("LF Xunchi"), acquired 50% equity interest plus one shares in SC Aipu and its subsidiaries (collectively referred to as "Aipu Group") (Note 4).

Summary of Company Subsidiaries and Its Consolidated Variable Interest Entities (Parenthetical) (Detail)	Sep. 30, 2014	Aug. 10, 2014	Aug. 01, 2014	May 31, 2014	Apr. 30, 2013	Feb. 28, 2013	Sep. 09, 2012
Beijing Yichengtaihe Investment Co., Ltd
Business Acquisition [Line Items]
Business acquisition, equity interests acquired	100.00%
iJoy
Business Acquisition [Line Items]
Business acquisition, equity interests acquired					100.00%
Sichuan Aipu Network Co., Ltd. and its Subsidiaries ("Aipu Group")
Business Acquisition [Line Items]
Business acquisition, equity interests acquired				50.00%
Dermot Entities
Business Acquisition [Line Items]
Business acquisition, equity interests acquired		100.00%
Fastweb Acquisition
Business Acquisition [Line Items]
Business acquisition, equity interests acquired							100.00%
Held directly by aBitCool BJ \| Shanghai Guotong Network Co., Ltd. ("SH Guotong") \| Variable Interest Entities
Business Acquisition [Line Items]
Business acquisition, equity interests acquired			100.00%
Held Directly by 21 Vianet Beijing \| Beijing Yichengtaihe Investment Co., Ltd \| Variable Interest Entities
Business Acquisition [Line Items]
Business acquisition, equity interests acquired	100.00%
Held Directly by 21 Vianet Beijing \| Tianwang And Yilong Acquisition
Business Acquisition [Line Items]
Business acquisition, equity interests acquired						100.00%
Held Directly by 21 Vianet Beijing \| Fastweb Acquisition
Business Acquisition [Line Items]
Business acquisition, equity interests acquired							100.00%

Organization - Additional Information (Detail) ¥ in Thousands, $ in Thousands			1 Months Ended	12 Months Ended
	Jul. 31, 2013	Jul. 30, 2013 CNY (¥)	Jan. 31, 2011 CNY (¥)	Dec. 31, 2014 CNY (¥) Entity	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)	Dec. 31, 2014 USD ($) Entity
Organization [Line Items]
Number of additional VIEs controlled through Primary Beneficiaries \| Entity				2				2
Loans, aggregate principal amount				¥ 0		¥ 900,000		$ 0
Assets pledged as collateral				14,298				2,304
Net loss				(348,480)	$ (56,166)	(48,226)	¥ 56,324
Accumulated deficit				(1,794,975)		(1,429,410)		(289,297)
Related Party
Organization [Line Items]
Net loss				(328,477)	$ (52,942)	(47,003)
Accumulated deficit				(1,794,975)		(1,429,410)		(289,297)
Net current liability				122,495				$ 19,744
Dongguan Asia Cloud Investment Co. Ltd. ("Asia Cloud Investment")
Organization [Line Items]
Investment repurchased period		5 years
Investment repurchase agreement, description of investments subject to agreement		The 10% equity interest in Asia Cloud Investment held by the SOE is contractually required to be repurchased by 21Vianet Technology by the end of five years from the establishment of Asia Cloud Investment at a consideration equivalent to the higher of the then fair value and the investment cost of RMB100,000. The SOE is also entitled to a cumulative dividend at 8% per annum for its capital contribution of RMB100,000 in Asia Cloud Investment.
Annual cumulative dividend percentage		8.00%
Aggregate amount of held to maturity securities				900,000
Dongguan Asia Cloud Investment Co. Ltd. ("Asia Cloud Investment") \| Minimum
Organization [Line Items]
Investment consideration at time of repurchase		¥ 100,000
Dongguan Asia Cloud Investment Co. Ltd. ("Asia Cloud Investment") \| Variable Interest Entities
Organization [Line Items]
Contributed capital		1,000,000
Dongguan Asia Cloud Investment Co. Ltd. ("Asia Cloud Investment") \| Variable Interest Entities \| 21Vianet Hong Kong Entities
Organization [Line Items]
Contributed capital		¥ 900,000
Business acquisition, equity interests acquired		90.00%
Dongguan Asia Cloud Investment Co. Ltd. ("Asia Cloud Investment") \| Variable Interest Entities \| State Owned Entity
Organization [Line Items]
Contributed capital		¥ 100,000
Minority interest ownership percentage		10.00%
Long Term Bank Borrowings
Organization [Line Items]
Loans, aggregate principal amount		¥ 900,000				¥ 900,000
Debt instrument, stated rate		4.00%				4.00%
Term Loan One \| Long Term Bank Borrowings
Organization [Line Items]
Debt instrument, maturity date	Aug. 28, 2015					Aug. 28, 2015
Term Loan Two \| Long Term Bank Borrowings
Organization [Line Items]
Debt instrument, maturity date	Sep. 10, 2015					Sep. 10, 2015
Loan Agreement \| Loan one
Organization [Line Items]
Loan facility provided to related parties			¥ 7,000
Loan Agreement \| Loan Two
Organization [Line Items]
Loan facility provided to related parties			¥ 3,000
Option Agreement
Organization [Line Items]
Exclusive option price				¥ 1
Agreement agreement between 21Vianet China and the 21Vianet Technology, term				10 years	10 years
Agreement agreement between 21Vianet China and the 21Vianet Technology, expiration date				Dec. 18, 2016	Dec. 18, 2016
Technical Consulting and Service Agreement
Organization [Line Items]
Agreement agreement between 21Vianet China and the 21Vianet Technology, term				10 years	10 years
Agreement agreement between 21Vianet China and the 21Vianet Technology, expiration date				Dec. 18, 2016	Dec. 18, 2016
Service fee per hour				¥ 1

Consolidated VIE Included in Accompanying Consolidated Financial Statements (Detail)
¥ in Thousands, $ in Thousands

12 Months Ended

Dec. 31, 2014

CNY (¥)

Dec. 31, 2014

USD ($)

Dec. 31, 2013

CNY (¥)

Dec. 31, 2012

CNY (¥)

Dec. 31, 2014

USD ($)

Dec. 31, 2013

USD ($)

Dec. 31, 2011

CNY (¥)

Current assets:

¥ 644,415

¥ 1,458,856

¥ 432,254

$ 103,861

$ 235,125

¥ 410,389

Restricted cash

161,649

193,020

26,053

Prepaid expenses and other current assets

10,059

1,621

Short-term investments

911,242

1,101,826

146,866

309,441

154,875

49,869

Amounts due from a related party

35,002

14,096

5,641

54,867

67,498

8,843

Total current assets

2,866,620

3,600,584

462,012

Non-current assets:

Property and equipment, net

3,036,707

1,402,177

489,429

Intangible assets, net

1,404,453

336,889

303,909

226,357

Land use right

66,878

10,778

1,755,970

410,500

296,688

283,011

66,161

217,436

Amount due from a related party

42,573

17,869

6,862

98,500

15,875

Other non-current assets

121,461

37,760

19,576

Long-term investments

126,307

106,727

20,357

Total non-current assets

6,773,561

2,530,978

1,091,701

Total assets

9,640,181

6,131,562

1,553,713

Current liabilities:

Short-term bank borrowings

160,181

173,726

25,816

Accounts and notes payable

386,074

188,217

62,224

Accrued expenses and other payables

599,491

292,421

96,620

Advance from customers

97,679

546

15,743

Income tax payable

35,013

11,476

5,643

Amount due to related parties

347,441

32,558

55,997

326,804

147,699

52,671

Current portion of capital lease obligation

71,939

14,600

11,594

6,150

991

Total current liabilities

2,696

3,115

435

2,989,115

1,061,358

481,756

Non-current liabilities:

Other long-term borrowings

900,000

Non-current portion of capital lease obligations

511,679

337,139

82,468

Unrecognized tax benefits

20,453

18,559

3,296

310,340

78,593

50,018

27,422

18,046

4,420

Mandatorily redeemable noncontrolling interests

74,044

11,934

773,706

124,699

$ 0

¥ 0

Total non-current liabilities

3,650,403

2,594,903

588,339

Total liabilities

6,639,518

3,656,261

1,070,095

Net revenues

2,876,447

$ 463,599

1,966,717

1,524,158

Net profit

(328,477)

(52,942)

(47,003)

57,656

Net cash provided by operating activities

325,365

52,443

64,531

173,923

Net cash used in investing activities

(2,261,797)

(364,536)

(1,507,315)

(175,670)

Net cash provided by financing activities

1,121,732

180,787

2,477,557

23,952

Net increase in cash and cash equivalents

(814,441)

(131,264)

1,026,602

21,865

Variable Interest Entity, Primary Beneficiary

Current assets:

Cash and cash equivalents

369,597

259,987

59,568

Restricted cash

61,649

3,020

9,936

Accounts receivable (net of allowance for doubtful accounts of RMB547 and RMB10,012 (US$1,614) as of December 31, 2013 and 2014, respectively)

677,375

605,205

109,173

Prepaid expenses and other current assets

9,673

1,559

Short-term investments

900,000

145,054

258,474

110,865

41,658

Amounts due from a related party

33,717

19,091

5,434

9,800

1,579

Total current assets

2,320,285

1,907,968

373,961

Non-current assets:

Property and equipment, net

1,945,176

813,939

313,505

Intangible assets, net

904,921

230,607

145,847

Land use right

66,175

10,665

1,146,570

410,500

184,794

Amount due from a related party

40,363

17,202

6,505

28,500

4,593

Other non-current assets

65,942

11,645

10,628

Long-term investments

110,626

98,526

17,830

Total non-current assets

4,308,273

1,582,419

694,367

Total assets

6,628,558

3,490,387

1,068,328

Current liabilities:

Short-term bank borrowings

160,181

173,726

25,816

Accounts and notes payable

340,519

186,381

54,882

Accrued expenses and other payables

375,124

195,816

60,459

Advance from customers

97,679

546

15,743

Income tax payable

27,677

11,427

4,461

338,655

32,558

54,581

Amount due to related parties

^[1]

491,522

394,418

79,219

^[2]

53,371

47,755

8,602

Current portion of capital lease obligation

54,984

14,600

8,862

Current portion of other long-term borrowings

900,000

145,054

6,150

991

Total current liabilities

2,696

3,115

435

2,848,558

1,060,342

459,105

Non-current liabilities:

Other long-term borrowings

1,137,850

240,337

183,388

900,000

Non-current portion of capital lease obligations

458,632

337,122

73,918

Unrecognized tax benefits

20,453

18,559

3,296

227,821

74,417

36,718

27,422

18,046

4,420

Mandatorily redeemable noncontrolling interests

74,044

11,934

100,000

16,117

Total non-current liabilities

2,046,222

1,688,481

329,791

Total liabilities

4,894,780

2,748,823

$ 788,896

Net revenues

2,695,021

434,359

2,051,248

1,527,626

Net profit

175,521

28,289

179,049

122,552

Net cash provided by operating activities

434,865

70,088

195,659

169,304

Net cash used in investing activities

(808,117)

(130,245)

(1,272,863)

(205,069)

Net cash provided by financing activities

480,045

77,369

1,168,139

110,076

Net increase in cash and cash equivalents

¥ 106,793

$ 17,212

¥ 90,935

¥ 74,311

[1]

[2]

Information with respect to related parties is discussed in Note 24.

Consolidated VIE Included in Accompanying Consolidated Financial Statements (Parenthetical) (Detail) - Variable Interest Entity, Primary Beneficiary
¥ in Thousands, $ in Thousands

12 Months Ended

Dec. 31, 2014

CNY (¥)

Dec. 31, 2014

USD ($)

Dec. 31, 2013

CNY (¥)

Dec. 31, 2012

CNY (¥)

Dec. 31, 2014

USD ($)

Variable Interest Entity [Line Items]

Accounts receivable, allowance for doubtful accounts

¥ 10,012

¥ 547

$ 1,614

21Vianet China and SZ Zhuoaiyi

^[1]

491,522

394,418

79,219

Variable Interest Entity [Line Items]

Amount paid to inter-companies

36,103

14,892

$ 5,819

¥ 0

$ 0

¥ 9,924

¥ 4,224

[1]

Summary of Significant Accounting Policies - Additional Information (Detail) ¥ in Thousands, $ in Thousands	1 Months Ended		4 Months Ended			12 Months Ended
	Jun. 30, 2014	Sep. 30, 2012	Dec. 31, 2014 CNY (¥) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2014 CNY (¥) shares	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 CNY (¥) shares	Dec. 31, 2013 USD ($) shares	Dec. 31, 2012 CNY (¥) shares	Dec. 31, 2012 USD ($) shares	Dec. 31, 2014 USD ($)	Sep. 04, 2014 USD ($)	Aug. 26, 2014 USD ($)	Sep. 30, 2013 USD ($)
Significant Accounting Policies [Line Items]
Official exchange rate of foreign currency remeasured (RMB per one U.S. dollar)			6.2046			6.2046						6.2046
Internal use software development costs, Amount capitalized			¥ 7,199			¥ 7,199		¥ 13,889		¥ 0		$ 1,160
Capitalized software costs, Amortization expense						8,333	$ 1,343	1,570		0
Capitalized internal use software development costs, Unamortized amount			¥ 9,854			¥ 9,854		12,319				$ 1,588
Cash flows estimated growth rate after six years using terminal value						3.00%	3.00%
Discount rate used in the valuations based on weighted average cost of capital			13.00%			13.00%						13.00%
Discounted cash flow projection period						6 years	6 years
Impairment losses pursuant to the goodwill tests						¥ 0	$ 0	0		0
Impairment loss on long-lived and intangible assets						0	0	0		0
Liabilities measured at fair value on recurring basis			¥ 2,874,204			2,874,204		1,311,846				$ 463,238
Value-added tax rate applicable to 21 Vianet China, 21 Vianet Technology and 21 Vianet Beijing	6.00%	6.00%
Business tax expenses and other surcharges						25,202	4,062	59,554		56,106
Advertising expense						¥ 19,687	$ 3,173	¥ 2,664		¥ 4,426
Estimated forfeiture rate for management and non-management employees						1.66%	1.66%	0.00%	0.00%	0.00%	0.00%
Share Repurchase Plan, share value						¥ 213,665		¥ 59,822
American Depository Shares
Significant Accounting Policies [Line Items]
Share Repurchase Plan, shares repurchased (in shares) \| shares			1,553,085	1,553,085	586,869	1,553,085	1,553,085	586,869	586,869	447,828	447,828
Share Repurchase Plan, share value			¥ 213,665	$ 34,437	$ 59,822
Short-term investments
Significant Accounting Policies [Line Items]
Impairment of investment						¥ 0	$ 0		$ 0		$ 0
Long-term investments
Significant Accounting Policies [Line Items]
Impairment of investment						¥ 0	$ 0	¥ 0		¥ 0
Option Three
Significant Accounting Policies [Line Items]
Business tax rate						3.00%	3.00%
Option Four
Significant Accounting Policies [Line Items]
Business tax rate						5.00%	5.00%
Bonds
Significant Accounting Policies [Line Items]
Liabilities measured at fair value on recurring basis			2,211,274			¥ 2,211,274		1,027,140				356,393
Quoted prices in active markets for identical assets and liabilities (Level 1)
Significant Accounting Policies [Line Items]
Liabilities measured at fair value on recurring basis			2,211,274			2,211,274		1,027,140
Quoted prices in active markets for identical assets and liabilities (Level 1) \| Bonds
Significant Accounting Policies [Line Items]
Liabilities measured at fair value on recurring basis			¥ 2,211,274			¥ 2,211,274		¥ 1,027,140				$ 356,393
Master Services Agreement
Significant Accounting Policies [Line Items]
Master service agreement terms						1 year	1 year
Maximum
Significant Accounting Policies [Line Items]
Cash equivalent maturity period						90 days	90 days
Short-term investment maturity period						365 days	365 days
Maximum \| American Depository Shares
Significant Accounting Policies [Line Items]
Share Repurchase Plan, value \| $													$ 100,000	$ 5,000	$ 10,000
Minimum
Significant Accounting Policies [Line Items]
Short-term investment maturity period						90 days	90 days
Minimum \| Capital Leases
Significant Accounting Policies [Line Items]
Capital lease recognition condition, lease term as a percentage of estimated remaining economic life						75.00%	75.00%
Capital lease recognition condition, minimum lease payments at the beginning of the lease term as a percentage of the fair value of the leased property						90.00%	90.00%

Estimated Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2014
Property \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	25 years
Property \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	46 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	Over the shorter of lease term or the estimated useful lives of the assets
Optical Fibers \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	10 years
Optical Fibers \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	20 years
Computer and network equipment \| Minimum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	4 years
Computer and network equipment \| Maximum
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	11 years
Office equipment
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Motor vehicles
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years

Weighted Average Useful Lives of Intangible Assets (Detail)

12 Months Ended

Dec. 31, 2014

Purchased software

6 years 4 months 24 days

Radio Spectrum License

15 years

Network Use Right

20 years

Contract Backlog

5 years 2 months 12 days

^[1]

Customer Relationships

9 years 6 months

^[1]

Supplier Relationships

8 years 10 months 24 days

^[1]

Licenses

15 years

^[1]

Trade Names

15 years 1 month 6 days

^[1]

Platform Software

5 years

^[1]

Non-complete agreement

5 years 1 month 6 days

^[1]

Internal Use Software

Property management relationship

1 year 7 months 6 days

9 years

^[1]

[1]	Acquired in the acquisitions of subsidiaries (Note 4).

Interest Expense (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
Interest Expense (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)
Supplemental Income Statement Elements [Abstract]
Interest expense and amortization cost of bonds	¥ 130,355	$ 21,009	¥ 69,785
Interest expense on bank and other borrowings	66,699	10,750	43,839	¥ 17,807
Interest expense on capital lease	40,849	6,584	31,863	5,287
Total interest costs	237,903	38,343	145,487	23,094
Less: Total interest costs capitalized	(5,883)	(948)	(8,712)	(11,718)
Interest expense, net	¥ 232,020	$ 37,395	¥ 136,775	¥ 11,376

Concentration of Risks - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 CNY (¥) Customer	Dec. 31, 2013 CNY (¥) Customer	Dec. 31, 2012 Customer	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Concentration Risk [Line Items]
Appreciation of RMB against US$	(0.40%)	3.00%	0.20%
Customer Concentration Risk
Concentration Risk [Line Items]
Concentration of risk, percentage	7.00%	16.00%	22.00%
Number of customers who contributed more than 4% of Company's revenue	0	0	0
Bandwidth and Cabinet Resources \| Supplier Concentration Risk
Concentration Risk [Line Items]
Concentration of risk, percentage	21.00%	23.00%	23.00%
Bandwidth and Cabinet Resources \| Customer Concentration Risk \| Largest single customer \| Maximum
Concentration Risk [Line Items]
Concentration of risk, percentage	4.00%	4.00%	4.00%
PRC \| Credit Concentration Risk
Concentration Risk [Line Items]
Cash and cash equivalents and short-term investments, deposited with major financial institution	¥ 1,557,334	¥ 1,450,939		$ 250,997
Outside the PRC \| Credit Concentration Risk
Concentration Risk [Line Items]
Cash and cash equivalents and short-term investments, deposited with major financial institution	¥ 281,387			$ 45,352	$ 251,387

Acquisitions - Additional Information (Detail)
¥ in Thousands, $ in Thousands

1 Months Ended

5 Months Ended

7 Months Ended

12 Months Ended

Sep. 30, 2014

CNY (¥)

Sep. 30, 2014

USD ($)

Aug. 15, 2014

CNY (¥)

Aug. 15, 2014

USD ($)

Aug. 10, 2014

CNY (¥)

Aug. 10, 2014

USD ($)

May 31, 2014

CNY (¥)

May 31, 2014

USD ($)

Apr. 30, 2013

CNY (¥)

Feb. 28, 2013

CNY (¥)

Sep. 09, 2012

CNY (¥)

Jul. 02, 2012

CNY (¥)

Oct. 19, 2011

CNY (¥)

Dec. 31, 2013

CNY (¥)

Apr. 30, 2013

CNY (¥)

Dec. 31, 2014

CNY (¥)

Tranche

Dec. 31, 2014

USD ($)

Tranche

Dec. 31, 2014

CNY (¥)

Tranche

Dec. 31, 2014

USD ($)

Tranche

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

CNY (¥)

Tranche

Dec. 31, 2014

USD ($)

Tranche

Dec. 31, 2013

CNY (¥)

Dec. 31, 2013

USD ($)

Dec. 31, 2012

CNY (¥)

¥ (137,445)

$ (22,152)

Bargain purchase gain

¥ 0

¥ 10,539

Revenue since acquisition date

64,232

10,352

20,515

3,306

Net profit (loss) since acquisition date

4,898

789

Beijing Yichengtaihe Investment Co., Ltd

^[1]

¥ 49,554

$ 7,986

Sep. 30, 2014

¥ 198,846

$ 32,049

100.00%

21V Xi'an

Jul. 02, 2012

¥ 15,977

Bargain purchase gain

¥ 10,539

May 31, 2014

¥ 748,971

$ 120,712

Business acquisition, equity interests share acquired | shares

50.00%

Minority interest ownership percentage

50.00%

Number of tranches | Tranche

Revenue since acquisition date

¥ 385,032

$ 62,056

Net profit (loss) since acquisition date

¥ 41,290

$ 6,655

Aipu Group | Scenario, Forecast

¥ 700,000

^[2]

$ 112,820

^[2]

¥ 700,000

Business acquisition, equity interests held by non controlling interest holders maximum percentage of eligible shares to be put each year by option exercise right

11.00%

28.00%

Aipu Group | Floor

Financial and operational performance targeted amount used to compute put option exercise price

700

Aipu Group | Ceiling [Member]

Financial and operational performance targeted amount used to compute put option exercise price

800

Aug. 10, 2014

¥ 953,567

$ 153,687

Revenue since acquisition date

100.00%

¥ 193,235

$ 31,144

Net profit (loss) since acquisition date

¥ 9,542

$ 1,538

Dermot Entities | Restricted Stock Units (RSUs)

¥ 598,500

^[3]

$ 96,461

^[3]

598,500

Business acquisition, share units to be settled in cash or shares | shares

237,874

Feb. 28, 2013

¥ 73,389

100.00%

Fair value of contingent consideration in shares reclassified to additional paid in capital

¥ 17,500

^[4]

¥ 2,000

¥ 15,500

7,762

$ 1,251

15,960

$ 2,572

Apr. 30, 2013

¥ 96,957

100.00%

Fair value of contingent consideration in shares reclassified to additional paid in capital

^[5]

¥ 24,663

¥ 21,076

$ 3,397

31,956

Fastweb Acquisition

Sep. 09, 2012

¥ 116,040

Fair value of contingent consideration in shares reclassified to additional paid in capital

100.00%

45,012

¥ 41,197

Guangzhou Gehua Network Technology and Development Co., Ltd. ("Gehua")

Oct. 19, 2011

¥ 77,469

Fair value of contingent consideration in shares reclassified to additional paid in capital

100.00%

¥ 21,482

$ 3,462

¥ 38,665

[1]	RMB49,554 of the above cash consideration was paid in 2014.
[2]	RMB700,000 of the above cash consideration was paid in 2014.
[3]	RMB 598,500 of the above cash consideration was paid in 2014.
[4]	RMB15,500 and RMB2,000 of the above cash consideration were paid in April and December 2013, respectively.
[5]	The Company has paid the first cash payment of approximately RMB24,883 to the seller of iJoy in 2013. The remaining balance of contingent consideration in cash of approximately RMB25,146 is to be paid when certain post-closing conditions are met.

Purchase Consideration (Detail)
¥ in Thousands, $ in Thousands

1 Months Ended

12 Months Ended

Aug. 10, 2014

CNY (¥)

Aug. 10, 2014

USD ($)

May 31, 2014

CNY (¥)

May 31, 2014

USD ($)

Apr. 30, 2013

CNY (¥)

Feb. 28, 2013

CNY (¥)

Dec. 31, 2013

CNY (¥)

May 31, 2013

CNY (¥)

Apr. 30, 2013

CNY (¥)

Dec. 31, 2014

CNY (¥)

Dec. 31, 2014

USD ($)

¥ (137,445)

$ (22,152)

¥ 598,500

^[1]

$ 96,461

^[1]

598,500

953,567

153,687

^[2],[3],[4]

¥ 355,067

$ 57,226

^[5]

49,554

7,986

^[3],[6]

7,339

1,183

64,232

10,352

^[3],[6],[7]

7,339

$ 1,183

¥ 17,500

^[8]

¥ 2,000

¥ 15,500

^{[9],[10],[11]}

19,977

73,389

^{[9],[10],[11]}

25,457

Share consideration

¥ 10,455

^[10],[12]

¥ 10,455

^[13]

¥ 24,663

^[14],[15]

25,146

96,957

^{[9],[14],[15]}

¥ 47,148

¥ 700,000

^[16]

$ 112,820

^[16]

¥ 700,000

^[17],[18]

48,971

7,892

¥ 748,971

$ 120,712

[1]	RMB 598,500 of the above cash consideration was paid in 2014.
[2]	As the contingent consideration in shares is predominately derived from a financial performance parameter other than the fair value of the issuer's shares, it is liability-classified and is remeasured at the end of each reporting period with an adjustment for fair value recorded to the current period expense.
[3]	The Company determined the fair value of the contingent share consideration with the assistance of an independent third party valuation firm.
[4]	The contingent consideration in shares are determined based on the achievement by Dermot Entities of certain financial targets in accordance with the sales and purchase agreement for the fiscal years 2014 and 2015 as well as compliance to the terms of the sales and purchase agreement. The above contingent consideration amounts were derived from the Company's assessment of whether Dermot Entities will meet the contractually stipulated targets. The outstanding contingent consideration related to fiscal 2014 and 2015 has been recorded in the "Amount due to related parties" balance within the Company's statement of financial position.
[5]	RMB49,554 of the above cash consideration was paid in 2014.
[6]	The contingent consideration in both cash and shares are determined based on the achievement by Guangdong Tianying Information Technology., Co., Ltd. ("GD Tianying") of certain financial and operational targets in accordance with the sales and purchase agreement for the fiscal years 2014, 2015 and 2016 as well as compliance to the terms of the sales and purchase agreement. The above contingent consideration amounts were derived from the Company's assessment of whether GD Tianying will meet the contractually stipulated targets. The outstanding contingent consideration related to fiscal 2014, 2015 and 2016 has been recorded in the "Amount due to related parties" balance within the Company's Consolidated Balance Sheets.
[7]	As the contingent consideration of GD Tianying in shares is predominately derived from a financial and operational performance parameter other than the fair value of the issuer's shares, it is liability-classified and is remeasured at the end of each reporting period with an adjustment for fair value recorded to the current period expense.
[8]	RMB15,500 and RMB2,000 of the above cash consideration were paid in April and December 2013, respectively.
[9]	As the contingent consideration in shares is not considered to be indexed to its own shares since the settlement amount is determined based on the agreed targets, it is liability-classified and is remeasured at the end of each reporting period with an adjustment for fair value recorded to the current period expense.
[10]	The Company determined the fair value of the share consideration and contingent consideration in cash and ordinary shares with the assistance of an independent third party valuation firm.
[11]	The contingent consideration in both cash and shares are determined based on the achievement by Tianwang and Yilong of certain financial targets in accordance with the sales and purchase agreement for the fiscal years 2013 and 2014 as well as compliance to the terms of the sales and purchase agreement. The above contingent consideration amounts were derived from the Company's assessment of whether Tianwang and Yilong would meet the contractually stipulated targets. The outstanding contingent consideration related to year 2014 has been recorded in the "Amount due to related parties" balance within the Company's statement of financial position (Note 24).
[12]	Share consideration represents a payment of RMB10,455 equivalent ADS shares was subsequently settled in May 2013. This share consideration was classified as a liability initially measured at its estimated fair value on the acquisition date and was reclassified to additional paid in capital when the number of shares to be issued became fixed.
[13]	The Company has paid the first cash payment of approximately RMB24,883 to the seller of iJoy in 2013. The remaining balance of contingent consideration in cash of approximately RMB25,146 is to be paid when certain post-closing conditions are met.
[14]	The Company determined the fair value of the contingent consideration in cash and ordinary shares with the assistance of an independent third party valuation firm.
[15]	The contingent considerations are determined based on the achievement by iJoy of certain financial targets in accordance with the sales and purchase agreement for the fiscal years 2013, 2014 and 2015 as well as meeting certain operational milestones provided in the terms of the sales and purchase agreement. The above contingent consideration amounts were derived from the Company's assessment of whether iJoy will meet the contractually stipulated targets. The outstanding contingent consideration related to fiscal 2015 has been recorded in the "Amount due to related parties" balance within the Company's Consolidated Balance Sheets (Note 24).
[16]	RMB700,000 of the above cash consideration was paid in 2014.
[17]	The Company determined the fair value of the contingent consideration with the assistance of an independent third party valuation firm.
[18]	The contingent consideration in cash was determined based on the achievement by Aipu Group of certain revenue and net profit targets as well as certain operational performance targets in accordance with the sales and purchase agreement for the fiscal years 2014, 2015 and 2016. The Company determined the fair value of the contingent cash consideration as of the acquisition date and at the end of 2014 with the assistance of an independent third party valuation firm based on the Company's assessment of whether Aipu Group will meet the aforementioned contractually stipulated targets. The outstanding contingent consideration amount was recorded in the "Amount due to related parties" balance within the Company's consolidated balance sheets (Note 24).

Purchase Consideration (Parenthetical) (Detail)
¥ in Thousands, $ in Thousands

1 Months Ended

12 Months Ended

Aug. 10, 2014

CNY (¥)

^[1]

Aug. 10, 2014

USD ($)

^[1]

May 31, 2014

CNY (¥)

^[7]

May 31, 2014

USD ($)

^[7]

Apr. 30, 2013

CNY (¥)

Feb. 28, 2013

CNY (¥)

Dec. 31, 2013

CNY (¥)

May 31, 2013

CNY (¥)

Apr. 30, 2013

CNY (¥)

Dec. 31, 2014

CNY (¥)

Dec. 31, 2014

USD ($)

Dec. 31, 2013

CNY (¥)

Dec. 31, 2013

USD ($)

¥ (137,445)

$ (22,152)

¥ 598,500

$ 96,461

598,500

^[2]

49,554

7,986

Fair value of contingent consideration in shares

¥ 17,500

^[3]

¥ 2,000

¥ 15,500

Share consideration

¥ 10,455

^[4],[5]

¥ 10,455

10,082

¥ 10,082

Fair value of contingent consideration in shares reclassified to additional paid in capital

7,762

1,251

15,960

$ 2,572

Fair value of contingent consideration in shares reclassified to additional paid in capital

^[6]

¥ 24,663

21,076

$ 3,397

31,956

Contingent consideration payable in cash

24,883

¥ 25,146

¥ 700,000

$ 112,820

¥ 700,000

[1]	RMB 598,500 of the above cash consideration was paid in 2014.
[2]	RMB49,554 of the above cash consideration was paid in 2014.
[3]	RMB15,500 and RMB2,000 of the above cash consideration were paid in April and December 2013, respectively.
[4]	Share consideration represents a payment of RMB10,455 equivalent ADS shares was subsequently settled in May 2013. This share consideration was classified as a liability initially measured at its estimated fair value on the acquisition date and was reclassified to additional paid in capital when the number of shares to be issued became fixed.
[5]	The Company determined the fair value of the share consideration and contingent consideration in cash and ordinary shares with the assistance of an independent third party valuation firm.
[6]	The Company has paid the first cash payment of approximately RMB24,883 to the seller of iJoy in 2013. The remaining balance of contingent consideration in cash of approximately RMB25,146 is to be paid when certain post-closing conditions are met.
[7]	RMB700,000 of the above cash consideration was paid in 2014.

Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) ¥ in Thousands, $ in Thousands							12 Months Ended
	Sep. 30, 2014 CNY (¥)	Sep. 30, 2014 USD ($)	Aug. 10, 2014 CNY (¥)	Aug. 10, 2014 USD ($)	May 31, 2014 CNY (¥)	May 31, 2014 USD ($)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Aug. 10, 2014 USD ($)	May 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2013 USD ($)	Dec. 31, 2012 CNY (¥)	Dec. 31, 2011 CNY (¥)
Business Acquisition [Line Items]
Goodwill							¥ 1,755,970		$ 283,011				¥ 410,500	$ 66,161	¥ 296,688	¥ 217,436
Aipu Group
Business Acquisition [Line Items]
Current assets					¥ 100,741							$ 16,236
Other non-current assets					15,243							2,457
Property and equipment, net					681,979							109,915
Total assets acquired					1,534,492							247,315
Accounts and notes payable					(31,097)							(5,012)
Deferred revenue-current					(390,000)							(62,857)
Other current liabilities					(190,317)							(30,673)
Deferred tax liabilities					(124,356)							(20,043)
Other non-current liabilities					(1,367)							(220)
Total liabilities assumed					(737,137)							(118,805)
Net assets acquired					797,355							128,510
Purchase consideration					748,971	$ 120,712
Fair value of noncontrolling interests					748,040							120,562
Goodwill					699,656							112,764
Aipu Group \| Customer Relationships
Business Acquisition [Line Items]
Business combination, intangible assets					456,079							73,507
Aipu Group \| Trade Names
Business Acquisition [Line Items]
Business combination, intangible assets					110,748							17,849
Aipu Group \| Property management relationship
Business Acquisition [Line Items]
Business combination, intangible assets					86,873							14,001
Aipu Group \| Non-complete agreement
Business Acquisition [Line Items]
Business combination, intangible assets					26,670							4,298
Aipu Group \| Supplier Relationships
Business Acquisition [Line Items]
Business combination, intangible assets					23,453							3,780
Aipu Group \| Licenses
Business Acquisition [Line Items]
Business combination, intangible assets					10,744							1,732
Aipu Group \| Purchased software
Business Acquisition [Line Items]
Business combination, intangible assets					9,819							1,583
Aipu Group \| Land Use Rights [Member]
Business Acquisition [Line Items]
Business combination, intangible assets					¥ 12,143							$ 1,957
Dermot Entities
Business Acquisition [Line Items]
Current assets			¥ 77,886								$ 12,552
Other non-current assets			655								106
Property and equipment, net			40,006								6,448
Total assets acquired			511,044								82,366
Accounts and notes payable			(39,293)								(6,333)
Other current liabilities			(42,555)								(6,859)
Deferred tax liabilities			(81,657)								(13,161)
Other non-current liabilities			(3,372)								(543)
Total liabilities assumed			(166,877)								(26,896)
Net assets acquired			344,167								55,470
Purchase consideration			953,567	$ 153,687
Goodwill			609,400								98,217
Dermot Entities \| Customer Relationships
Business Acquisition [Line Items]
Business combination, intangible assets			207,767								33,486
Dermot Entities \| Trade Names
Business Acquisition [Line Items]
Business combination, intangible assets			116,266								18,739
Dermot Entities \| Supplier Relationships
Business Acquisition [Line Items]
Business combination, intangible assets			30,073								4,847
Dermot Entities \| Licenses
Business Acquisition [Line Items]
Business combination, intangible assets			3,772								608
Dermot Entities \| Purchased software
Business Acquisition [Line Items]
Business combination, intangible assets			360								58
Dermot Entities \| Contract Backlog
Business Acquisition [Line Items]
Business combination, intangible assets			¥ 34,259								$ 5,522
Other acquisitions
Business Acquisition [Line Items]
Current assets							13,472		2,171
Other non-current assets							262		42
Property and equipment, net							15,912		2,565
Total assets acquired							54,739		8,822
Accounts and notes payable							(5,768)		(930)
Other current liabilities							(10,124)		(1,631)
Deferred revenue-non-current							(750)		(121)
Deferred tax liabilities							(4,683)		(755)
Total liabilities assumed							(21,325)		(3,437)
Net assets acquired							33,414		5,386
Purchase consideration							64,232	$ 10,352
Fair value of noncontrolling interests							5,597		902
Goodwill							36,415		5,869
Other acquisitions \| Customer Relationships
Business Acquisition [Line Items]
Business combination, intangible assets							9,381		1,512
Other acquisitions \| Non-complete agreement
Business Acquisition [Line Items]
Business combination, intangible assets							300		48
Other acquisitions \| Supplier Relationships
Business Acquisition [Line Items]
Business combination, intangible assets							14,516		2,340
Other acquisitions \| Licenses
Business Acquisition [Line Items]
Business combination, intangible assets							¥ 896		$ 144
Beijing Yichengtaihe Investment Co., Ltd
Business Acquisition [Line Items]
Cash and cash equivalent	¥ 1,098									$ 177
Other current liabilities	(1,008)									(162)
Deferred tax liabilities	(42,368)									(6,828)
Purchase consideration	198,846	$ 32,049
Beijing Yichengtaihe Investment Co., Ltd \| Property
Business Acquisition [Line Items]
Property and equipment, net	160,974									25,944
Beijing Yichengtaihe Investment Co., Ltd \| Equipment
Business Acquisition [Line Items]
Property and equipment, net	25,661									4,136
Beijing Yichengtaihe Investment Co., Ltd \| Land Use Rights [Member]
Business Acquisition [Line Items]
Business combination, intangible assets	¥ 54,489									$ 8,782

Accounts and Notes Receivable and Allowance for Doubtful Accounts (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Receivables [Abstract]
Accounts receivable	¥ 749,456	$ 120,790	¥ 610,960
Notes receivable	905	146	0
Allowance for doubtful debts	(10,416)	(1,678)	(547)
Accounts and notes receivable (net of allowance for doubtful accounts of RMB547 and RMB10,416 (US$1,678) as of December 31, 2013 and 2014, respectively)	¥ 739,945	$ 119,258	¥ 610,413

Analysis of Allowance for Doubtful Accounts (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2014 USD ($)
Receivables [Abstract]
Balance at beginning of the year	¥ 547	$ 88	¥ 341
Provision	9,924		502	$ 1,599
Write-off of accounts receivable	(55)	(9)	(296)
Balance at the end of the year	¥ 10,416	$ 1,678	¥ 547

Short Term Investments (Detail) - Short-term investments ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Investment [Line Items]
Held-to-maturity securities	¥ 911,242	$ 146,866	¥ 1,101,826
Fixed rate time deposits
Investment [Line Items]
Held-to-maturity securities	11,242	1,812	127,023
Floating Rate Time Deposits
Investment [Line Items]
Held-to-maturity securities	0	0	74,803
Floating Rate Principal Guaranteed Investments
Investment [Line Items]
Held-to-maturity securities	0	0	900,000
Fixed rate principal guaranteed investments
Investment [Line Items]
Held-to-maturity securities	¥ 900,000	$ 145,054	¥ 0

Short-Term Investments - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)
Investment [Line Items]
Investments, interest income	¥ 67,904	$ 10,944	¥ 48,503	¥ 16,301
Short-term investments
Investment [Line Items]
Investments, interest income	50,882	8,405	35,649	12,708
Unrealized Gain (Loss) on Investments	¥ 0	$ 0	¥ 0	¥ 0

Inventories (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Inventory Disclosure [Abstract]
Broadband related products	¥ 10,059	$ 1,621	¥ 0

Prepaid Expenses and Other Current Assets (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses for bandwidth, rented data centers or cabinets	¥ 66,896	$ 10,782	¥ 26,332
Staff field advances	8,453	1,362	3,716
Interest receivables	13,275	2,140	28,404
Receivables for the disposal of certain construction-in-progress	20,290	3,270	20,290
Loans to shareholder of BJ Yichengtaihe	0	0	24,000
Tax recoverables	66,492	10,717	21,345
Deposits	9,793	1,578	10,079
Loan to third parties	48,422	7,804	6,987
Other receivables	75,820	12,216	13,722
Prepaid expenses and other current assets	¥ 309,441	$ 49,869	¥ 154,875

Property and Equipment Including Those Held Under Capital Leases (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	¥ 3,257,557	$ 525,023	¥ 1,658,687
Less: accumulated depreciation	(706,111)	(113,804)	(429,761)
Property Plant And Equipment Net Excluding Construction In Progress, Total	2,551,446	411,219	1,228,926
Construction-in-progress	485,261	78,210	173,251
Property and Equipment, net	3,036,707	489,429	1,402,177
Property
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	439,480	70,831	397,389
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	359,870	58,001	228,101
Computer and network equipment
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	2,225,419	358,672	960,029
Optical Fibers
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	207,423	33,431	64,700
Office equipment
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	18,472	2,977	6,717
Motor vehicles
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	¥ 6,893	$ 1,111	¥ 1,751

Property and Equipment Net - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)
Property, Plant and Equipment [Line Items]
Depreciation expense	¥ 278,986	$ 44,964	¥ 141,286	¥ 92,786
Assets held under capital leases
Property, Plant and Equipment [Line Items]
Depreciation expense	¥ 22,302	$ 3,594	¥ 18,820	¥ 15,934

Depreciation Expense (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)
Property, Plant and Equipment [Line Items]
Depreciation expenses	¥ 278,986	$ 44,964	¥ 141,286	¥ 92,786
Cost of Revenues
Property, Plant and Equipment [Line Items]
Depreciation expenses	225,680	36,373	103,002	69,883
Selling and Marketing Expense
Property, Plant and Equipment [Line Items]
Depreciation expenses	3,397	575	2,097	814
General and Administrative Expense
Property, Plant and Equipment [Line Items]
Depreciation expenses	19,433	3,104	10,271	2,691
Research and Development Expense
Property, Plant and Equipment [Line Items]
Depreciation expenses	¥ 30,476	$ 4,912	¥ 25,916	¥ 19,398

Carrying Amounts of Property and Equipment Held Under Capital Leases (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Capital Leased Assets [Line Items]
Property and Equipment Held Under Capital Leases, gross	¥ 737,259	$ 118,825	¥ 517,949
Less: accumulated depreciation	(74,237)	(11,965)	(51,935)
Property and Equipment Held Under Capital Leases, net	663,022	106,860	466,014
Property
Capital Leased Assets [Line Items]
Property and Equipment Held Under Capital Leases, gross	365,353	58,884	365,353
Computer and network equipment
Capital Leased Assets [Line Items]
Property and Equipment Held Under Capital Leases, gross	164,483	26,510	87,896
Optical Fibers
Capital Leased Assets [Line Items]
Property and Equipment Held Under Capital Leases, gross	¥ 207,423	$ 33,431	¥ 64,700

Carrying Amounts of Computer and Network Equipment Pledged to Secure Banking Borrowings (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	¥ 14,298	$ 2,304
Property
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	22,921	3,694	¥ 0
Computer and network equipment
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	¥ 42,115	$ 6,788	¥ 94,129

Summary of Intangible Assets (Detail)
¥ in Thousands, $ in Thousands

12 Months Ended

Dec. 31, 2014

CNY (¥)

Dec. 31, 2014

USD ($)

Dec. 31, 2013

CNY (¥)

Dec. 31, 2012

CNY (¥)

¥ 336,889

¥ 303,909

1,203,774

95,273

(9,993)

(42)

1,452

(3,348)

(127,669)

$ (20,577)

(58,903)

¥ (35,377)

1,404,453

226,357

336,889

303,909

Purchased software

22,773

13,527

64,778

13,934

(8,662)

(42)

1,025

(12,882)

(4,646)

67,032

10,803

22,773

13,527

Radio Spectrum License

104,013

115,306

427

(3,348)

(8,560)

(7,945)

95,880

15,453

104,013

115,306

Network Use Right

18,834

19,833

(1,000)

(999)

17,834

2,874

18,834

19,833

Contract Backlog

^[1]

956

1,529

^[1]

34,259

4,320

^[1]

^[1]

^[1]

(3,701)

(4,893)

^[1]

31,514

5,079

956

1,529

Customer Relationships

^[1]

52,870

37,635

^[1]

673,227

27,770

^[1]

^[1]

^[1]

(48,666)

(12,535)

^[1]

677,431

109,182

52,870

37,635

Licenses

^[1]

3,159

1,213

^[1]

15,412

2,160

^[1]

^[1]

^[1]

(786)

(214)

^[1]

17,785

2,866

3,159

1,213

Supplier Relationships

^[1]

93,287

93,554

^[1]

68,042

14,950

^[1]

^[1]

^[1]

(20,325)

(15,217)

^[1]

141,004

22,726

93,287

93,554

Trade Names

^[1]

11,985

13,005

^[1]

227,014

^[1]

^[1]

^[1]

(9,902)

(1,020)

^[1]

229,097

36,924

11,985

13,005

Platform Software

^[1]

15,411

8,307

^[1]

10,250

^[1]

^[1]

^[1]

(3,829)

(3,146)

^[1]

11,582

1,867

15,411

8,307

Non - Complete Agreement

^[1]

1,250

^[1]

26,970

1,500

^[1]

^[1]

^[1]

(4,022)

(250)

^[1]

24,198

3,900

1,250

Favorable Contract

^[1]

^[1]

6,500

^[1]

^[1]

^[1]

(32)

(6,468)

^[1]

Internal Use Software

12,319

7,199

13,889

(1,331)

(8,333)

(1,570)

Property management relationship

9,854

1,588

12,319

^[1]

^[1]

86,873

^[1]

^[1]

^[1]

(5,631)

^[1]

¥ 81,242

$ 13,095

¥ 0

[1]	Acquired in the acquisitions of subsidiaries

Intangible Assets Net - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)
Finite-Lived Intangible Assets [Line Items]
Intangible assets, amortization expenses	¥ 127,669	$ 20,577	¥ 58,903	¥ 35,377
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets	1 year	1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life of intangible assets	20 years	20 years

Annual Estimated Amortization Expenses of Intangible Assets (Detail) - Dec. 31, 2014 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
2015	¥ 189,106	$ 30,478
2016	171,481	27,638
2017	165,854	26,731
2018	149,625	24,115
2019	139,653	22,508
Finite-Lived Intangible Assets, Net, Total	¥ 815,719	$ 131,470

Land Use Rights (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Goodwill and Intangible Assets Disclosure [Abstract]
Cost	¥ 66,878	$ 10,778	¥ 0
Accumulated amortization	(703)	(113)	0
Land use rights, net	¥ 66,175	$ 10,665	¥ 0

Goodwill (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
Goodwill (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)
Goodwill and Intangible Assets Disclosure [Abstract]
Beginning Balance	¥ 410,500	$ 66,161	¥ 296,688	¥ 217,436
Goodwill acquired	1,345,470	216,850	113,812	79,252
Ending Balance	¥ 1,755,970	$ 283,011	¥ 410,500	¥ 296,688

Goodwill - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)
Goodwill and Intangible Assets Disclosure [Abstract]
Impairment losses pursuant to the goodwill tests	¥ 0	$ 0	¥ 0	¥ 0

Long-Term Investments - Additional Information (Detail) ¥ in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2013 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2014 USD ($)
Investment [Line Items]
Cost method investments, carrying amount	¥ 8,200	¥ 28,451	¥ 8,200	$ 4,585
M87
Investment [Line Items]
Impairment on long-term investment		0
Yizhuang Venture Investment Fund
Investment [Line Items]
Impairment on long-term investment		¥ 0
Investment in an equity investee, percentage	27.694%	27.694%	27.694%	27.694%
Investment in an equity investee, addition	¥ 50,500	¥ 0	¥ 50,500

Investment in Equity Investee (Detail) ¥ in Thousands, $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2013 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)	Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Share equity loss		¥ (671)	$ (108)	¥ (1,372)	¥ (1,101)
Yizhuang Venture Investment Fund
Schedule of Equity Method Investments [Line Items]
Investment in an equity investee, addition	¥ 50,500	0		50,500
Share equity loss		(671)		(1,372)
Cost investment	101,000	101,000		101,000	50,500
Accumulated, share equity loss	(2,473)	(3,144)		(2,473)	(1,101)
Investment in equity investee	¥ 98,527	¥ 97,856		¥ 98,527	¥ 49,399	$ 15,772

Summary of Bank and Other Borrowings (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Debt Disclosure [Abstract]
Short-term bank borrowings	¥ 160,181	$ 25,816	¥ 173,726
Long-term bank borrowings, current portion	55,647	8,968	197,000
Other long-term borrowings, current portion	900,000	145,054	0
Debt, Current, Total	1,115,828	179,838	370,726
Long-term bank borrowings, non-current portion	61,673	9,940	65,740
Other long-term borrowings, non-current portion	0	0	900,000
Long-term bank and other borrowings (including long-term bank and other borrowings of the Consolidated VIEs without recourse to the primary beneficiaries of RMB900,000 and nil as of December 31, 2013 and 2014, respectively)	61,673	9,940	965,740
Total bank and other borrowings	¥ 1,177,501	$ 189,779	¥ 1,336,466

Bank Borrowings - Additional Information (Detail) ¥ in Thousands, $ in Thousands		12 Months Ended
	Jul. 31, 2013	Dec. 31, 2014 CNY (¥)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2014 USD ($)	Jul. 30, 2013 CNY (¥)
Schedule Of Short And Long Term Debt [Line Items]
Short-term bank borrowings, weighted Average Interest rate		6.36%	7.00%	6.36%
Loans, aggregate principal amount		¥ 0	¥ 900,000	$ 0
Unused loan facilities (in RMB) or (in dollars)		¥ 169,954	¥ 77,243	$ 27,392
Long Term Bank Borrowings
Schedule Of Short And Long Term Debt [Line Items]
Long-term bank borrowings, weighted average interest rate		6.00%	7.12%	6.00%
Loans, aggregate principal amount			¥ 900,000		¥ 900,000
Debt instrument, stated rate			4.00%		4.00%
Long Term Bank Borrowings \| Term Loan One
Schedule Of Short And Long Term Debt [Line Items]
Debt instrument, maturity date	Aug. 28, 2015		Aug. 28, 2015
Long Term Bank Borrowings \| Term Loan Two
Schedule Of Short And Long Term Debt [Line Items]
Debt instrument, maturity date	Sep. 10, 2015		Sep. 10, 2015
Minimum
Schedule Of Short And Long Term Debt [Line Items]
Short-term bank borrowings, term		2 months
Maximum
Schedule Of Short And Long Term Debt [Line Items]
Short-term bank borrowings, term		1 year

Secured or Guaranteed Bank Borrowings (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Debt Instrument [Line Items]
Short-term borrowings	¥ 160,181	$ 25,816	¥ 173,726
Long-term bank and other borrowings (including current portion)	1,017,320		1,162,740
Unsecured Borrowing
Debt Instrument [Line Items]
Short-term borrowings	140,000		84,641
Long-term bank and other borrowings (including current portion)	38,477
Secured by the Pledged Dividend Right and the Rights to Sell or Transfer the 90% Equity Interest of Asia Cloud Investment
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)	900,000		900,000
Guaranteed by restricted cash \| Short-term bank borrowings 1
Debt Instrument [Line Items]
Short-term borrowings	9,181		19,085
Guaranteed by restricted cash \| Long-term bank and other borrowings, (including current portion) 2
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)			63,000
Guaranteed by restricted cash \| Long-term bank and other borrowings, (including current portion) 3
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)			180,000
Guaranteed by restricted cash \| Long-term bank and other borrowings, (including current portion) 4
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)	50,000
Secured by a subsidiary's computer and network equipment \| Short-term bank borrowings 2
Debt Instrument [Line Items]
Short-term borrowings			30,000
Secured by a subsidiary's computer and network equipment \| Long-term bank and other borrowings, (including current portion) 3
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)	18,753
Mr. Chen Sheng and Mr. Zhang Jun \| Short-term bank borrowings 3
Debt Instrument [Line Items]
Short-term borrowings			40,000
Jointly guaranteed by the Company's computer and network equipment \| Long-term bank and other borrowings, (including current portion) 1
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)			¥ 19,740
Jointly guaranteed by (i) the ultimate controlling shareholder of Dermot Entities and Upwise Investments Limited, the seller of Dermot Entitiest; (ii) restricted cash \| Long-term bank and other borrowings, (including current portion) 1
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)	2,090
Secured by a subsidiary building \| Short-term bank borrowings 2
Debt Instrument [Line Items]
Short-term borrowings	11,000
Secured by a subsidiary building \| Long-term bank and other borrowings, (including current portion) 2
Debt Instrument [Line Items]
Long-term bank and other borrowings (including current portion)	¥ 8,000

Secured or Guaranteed Bank Borrowings (Parenthetical) (Detail) ¥ in Thousands, $ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2014 HKD ($)	Dec. 31, 2013 CNY (¥)
Debt Instrument [Line Items]
Assets pledged as collateral	¥ 14,298	$ 2,304
Short-term bank borrowings 1
Debt Instrument [Line Items]
Restricted cash	¥ 1,885			¥ 2,099
Long-term bank and other borrowings, (including current portion) 1
Debt Instrument [Line Items]
Restricted cash \| $			$ 1,500
Long-term bank and other borrowings, (including current portion) 2
Debt Instrument [Line Items]
Restricted cash				100,000
Long-term bank and other borrowings, (including current portion) 3
Debt Instrument [Line Items]
Restricted cash				¥ 190,000
Secured by the Pledged Dividend Right and the Rights to Sell or Transfer the 90% Equity Interest of Asia Cloud Investment
Debt Instrument [Line Items]
Equity interest of Asia Cloud Investment, pledged as collateral	90.00%	90.00%	90.00%	90.00%
Long-term bank and other borrowings, (including current portion) 4
Debt Instrument [Line Items]
Restricted cash	¥ 100,000
Computer and network equipment
Debt Instrument [Line Items]
Assets pledged as collateral	42,115	$ 6,788		¥ 94,129
Computer and network equipment \| Short-term bank borrowings 2
Debt Instrument [Line Items]
Assets pledged as collateral				46,631
Computer and network equipment \| Long-term bank and other borrowings, (including current portion) 1
Debt Instrument [Line Items]
Assets pledged as collateral				47,498
Computer and network equipment \| Long-term bank and other borrowings, (including current portion) 3
Debt Instrument [Line Items]
Assets pledged as collateral	42,115
Property
Debt Instrument [Line Items]
Assets pledged as collateral	22,921	$ 3,694		¥ 0
Property \| Long-term bank and other borrowings, (including current portion) 2
Debt Instrument [Line Items]
Assets pledged as collateral	8,623
Buildings \| Short-term bank borrowings 2
Debt Instrument [Line Items]
Assets pledged as collateral	¥ 14,298

Components of Accrued Expenses and Other Payables (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)
Payables and Accruals [Abstract]
Payroll and welfare payables	¥ 178,295	$ 28,736	¥ 28,693
Business and other taxes payable	16,633	2,681	67,408
Payables for office supplies and utilities	8,782	1,415	3,650
Payables for the purchase of property and equipment	233,353	37,610	85,993
Payable for purchase intangible assets	5,054	815	10,000
Accrued service fees	60,167	9,697	37,130
Interest payables	20,452	3,296	36,254
Share-settled bonuses	14,913	2,404	6,441
Payable for assets acquisition	35,846	5,777	0
Others	25,996	4,189	16,852
Accrued expenses and other payables	¥ 599,491	$ 96,620	¥ 292,421

Future Minimum Lease Payments Under Non Cancellable Capital Lease Arrangements (Detail) - Dec. 31, 2014 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Capital Lease Obligations [Abstract]
2015	¥ 120,919	$ 19,489
2016	93,107	15,006
2017	117,797	18,985
2018	81,498	13,135
2019 and thereafter	782,823	126,168
Total minimum lease payments	1,196,144	192,783
Less: amount representing interest	(612,526)	(98,721)
Present value of remaining minimum lease payments	¥ 583,618	$ 94,062

Capital Leases - Additional Information (Detail)	Dec. 31, 2014	Dec. 31, 2013
Capital Leases
Schedule of Capital Lease Obligations [Line Items]
Weighted average interest rate	11.41%	11.88%

Bonds Payable - Additional Information (Detail) ¥ in Thousands, $ in Thousands						12 Months Ended
	Jun. 30, 2014 CNY (¥)	Jun. 30, 2014 USD ($)	Jun. 26, 2014 CNY (¥)	Jun. 26, 2014 USD ($)	Mar. 22, 2013 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)	Jun. 26, 2014 USD ($)
Debt Instrument [Line Items]
Proceeds from issuance of bonds, net						¥ 1,980,640	$ 319,221	¥ 972,841	¥ 0
Repurchase of 2016 Bonds						760,607	122,588	0	0
Interest paid						229,348	36,964	62,123	10,630
Loss on debt extinguishment						¥ 41,581	$ 6,702	¥ 0	¥ 0
Bonds 7.875% Due 2016
Debt Instrument [Line Items]
Debt instrument, face amount					¥ 1,000,000
Debt instrument, stated rate					7.875%
Debt instrument, maturity date					Mar. 22, 2016
Debt instrument, frequency of periodic payment						Payable semi-annually in arrears on March 22 and September 22 in each year	Payable semi-annually in arrears on March 22 and September 22 in each year
Debt instrument, date of first required payment					Sep. 22, 2013
Debt discount					¥ 1,970
Proceeds from issuance of bonds, net					¥ 972,841
Debt instrument, effective interest rate					9.29%
Percentage of principal amount redeemed	73.57%	73.57%
Repurchase of 2016 Bonds	¥ 776,163	$ 125,095
Interest paid	15,556	2,507
Loss on debt extinguishment	¥ 41,581	$ 6,702
Bonds 7.875% Due 2016 \| Other non-current assets
Debt Instrument [Line Items]
Debt issuance costs					¥ 25,189
Bonds 6.875 Percent Due 2017
Debt Instrument [Line Items]
Debt instrument, face amount			¥ 2,000,000							$ 322,341
Debt instrument, stated rate			6.875%							6.875%
Debt instrument, maturity date			Jun. 26, 2017	Jun. 26, 2017
Debt instrument, frequency of periodic payment						Payable semi-annually in arrears on June 26 and December 26 in each year	Payable semi-annually in arrears on June 26 and December 26 in each year
Debt instrument, date of first required payment			Dec. 26, 2014	Dec. 26, 2014
Debt issuance costs			¥ 19,360							$ 3,120
Proceeds from issuance of bonds, net			¥ 1,980,640	$ 319,221
Debt instrument, effective interest rate			7.39%							7.39%

Repayments of Principal Amounts of Long-Term Borrowings, Including Bonds Payable, Bank and Other Borrowings (Detail) - Dec. 31, 2014 ¥ in Thousands, $ in Thousands	CNY (¥)	USD ($)
Debt Disclosure [Abstract]
2015	¥ 1,055,648	$ 170,139
2016	280,554	45,217
2017	2,016,628	325,021
2018	18,976	3,058
2019	9,814	1,582
Thereafter	¥ 0	$ 0

Deferred Government Grants - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)
Deferred Government Grants
Component of Other Income, Nonoperating [Abstract]
Government grants received	¥ 20,920	$ 3,372	¥ 2,950	¥ 15,850

Movements of Deferred Government Grants (Detail) - Deferred Government Grants ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)
Component of Other Income, Nonoperating [Abstract]
Balance at beginning of the year	¥ 18,046	$ 2,908	¥ 18,793	¥ 5,819
Additions	20,920	3,372	2,950	15,850
Recognized in income as a reduction of depreciation expense	(5,394)	(869)	(3,697)	(2,876)
Balance at end of the year	¥ 33,572	$ 5,411	¥ 18,046	¥ 18,793

Treasury Stock - Additional Information (Detail) - American Depository Shares - shares		4 Months Ended		12 Months Ended
	Mar. 05, 2014	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Schedule of Capitalization, Equity [Line Items]
Share Repurchase Plan, shares repurchased (in shares)		1,553,085	586,869	1,553,085	586,869	447,828
Business acquisition, shares issued				0	840,114	2,343,239
Managed Network Entities \| Galaxy ENet Inc
Schedule of Capitalization, Equity [Line Items]
Business acquisition, shares issued	76,048			76,048

Changes in Accumulated Other Comprehensive Income (Loss) by Component, Net of Tax (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2014 CNY (¥)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	¥ (82,589)		¥ (57,367)	¥ (54,779)
Other comprehensive income (loss)	16,835	$ 2,713	(25,222)	(2,588)
Ending balance	(65,754)	(10,598)	(82,589)	(57,367)
Accumulated Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(82,589)		(57,367)	(54,779)
Other comprehensive income (loss)	16,835		(25,222)	(2,588)
Ending balance	¥ (65,754)	$ (10,598)	¥ (82,589)	¥ (57,367)

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.