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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, 2016, 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”) ⁽⁵⁾	September 9, 2012	Cayman Islands		100	%	Investment holding
Hong Kong Fastweb Holdings Co., Limited (“Fastweb HK”) ⁽⁵⁾	September 9, 2012	Hong Kong		100	%	Investment holding
Beijing Fastweb Technology Co., Ltd. (“Fastweb Technology”) ^{(1) /}⁽⁵⁾	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 Xi’an Holding Limited (“21V Xi’an Holding”) ⁽⁴⁾	July 5, 2012	British Virgin Islands		100	%	Investment holding
21Vianet (Xi’an) Technology Co., Ltd. (“Xi’an Tech”) ^{(1) /(4)}	July 5, 2012	PRC		100	%	Provision of technical and internet data center
21Vianet Hangzhou Information Technology Co., Ltd. (“HZ Technology”) ⁽¹⁾	March 4, 2013	PRC		100	%	Provision of internet data center services
21Vianet Mobile Limited (“21V Mobile”) ⁽⁷⁾	April 30, 2013	Hong Kong		100	%	Investment holding
Joytone Infotech Co., Ltd. (“SZ Zhuoaiyi”) ^{(1) / (7)}	April 30, 2013	PRC		100	%	Provision of technical and consultation services
21Vianet Ventures Limited (“Ventures”)	March 6, 2014	Hong Kong		100	%	Investment holding
WiFire Group Inc. (“WiFire Group”)	March 7, 2014	British Virgin Islands		100	%	Investment holding
Abitcool (China) Broadband Inc. (“aBitCool DG”) ⁽¹⁾	June 13, 2014	PRC		100	%	Dormant company
Diyixian.com Limited (“DYX”)⁽⁹⁾	August 10, 2014	Hong Kong		100	%	Provision of virtual private network services
Dermot Holding Limited (“Dermot BVI”) ⁽⁹⁾	August 8, 2014	British Virgin Islands		100	%	Investment holding
21Vianet Zhuhai Financial Leasing Co., Ltd. (“Zhuhai Financial Leasing”) ⁽¹⁾	April 9, 2015	PRC		100	%	Provision of financial leasing business services
Foshan Zhuoyi Intelligence Date Co., Ltd. (“FS Zhuoyi”)”) ^(1) /(11)	July 7, 2016	PRC		100	%	Dormant company

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)/ (7)}	April 30, 2013	PRC		—		Provision of internet data center, content delivery network services
WiFire Network Technology (Beijing) Co., Ltd. (formerly known as aBitCool Small Micro Network Technology (BJ) Co., Ltd.) (“WiFire Network”) ^{(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)/ (7)}	May 30, 2013	PRC		—		Provision of internet data center, 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
Held directly by 21Vianet Beijing:
21Vianet (Xi’an) Information Outsourcing Industry Park Services Co., Ltd. (“Xi’an Sub”) ^{(1) / (2)}	June 23, 2008	PRC		—		Provision of internet data center services
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) / (5)}	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
WiFire (Beijing) Technology Co., Ltd. (formerly known as Beijing Tianwang Online Communication Technology Co., Ltd.) (“WiFire BJ”) ^{(1) / (2) / (6)}	February 28, 2013	PRC		—		Provision of managed network services and virtual private network services
Beijing Yilong Xinda Technology Co., Ltd. (“BJ Yilong”) ^{(1) / (2) / (6)}	February 28, 2013	PRC		—		Provision of managed network services and virtual private network services
Beijing Yichengtaihe Investment Co., Ltd. (“BJ Yichengtaihe”) ^{(1)/ (2)/ (10)}	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 (“DYX net”)⁽⁹⁾	August 10, 2014	Hong Kong		100	%	Dormant Company

Held directly by DYX and LF Xunchi:
Shenzhen Diyixian Telecommunication 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, 2010, the Company through its subsidiary, 21Vianet Beijing acquired CYSD, ZBXT and its subsidiaries (collectively, the “Managed Network Entities”).

(4)	On July 5, 2012, the Company through its wholly-owned subsidiary, 21Vianet HK, acquired 100% equity interests in 21V Xi’an Holding and its subsidiaries (collectively referred to as “21V Xi’an”).

(5)	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”).

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

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

(8)	On May 31, 2014, the Company and its subsidiary, Langfang Xunchi Computer Data Processing Co., Ltd. (“LF Xunchi”), acquired 50% equity interest 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 September 30, 2014, the Company through its subsidiary, 21Vianet Beijing acquired 100% equity interest in the entity, which was accounted for an assets acquisition (Note 4).

(11)	On July 7, 2016, the Company through its subsidiary, 21Vianet HK acquired 100% equity interest in the entity, which was accounted for an assets 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 Executive Chairman of Board of Directors 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. On December 19, 2016, this agreement was renewed for another 10 years, expiring on December 18, 2026.

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. On December 19, 2016, this agreement was renewed for another 10 years, expiring on December 18, 2026.

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.

On August 10, 2015, a Notification of Cancellation of share pledge registration was issued by Beijing Administration for Industry and Commerce, Pinggu Branch to cancel the registration of the share pledge by one of the Nominee Shareholders, Zhang Jun. Such cancellation does not affect the effectiveness of the share pledge agreement and does not lessen the control imposed on the contractual parties of the Company.

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 BJ aBitCool 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 BJ aBitCool 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 applicable PRC laws and regulations in any material respect, and (ii) each of the VIE Agreements is valid, legally binding and enforceable to each party of such agreements under the existing PRC laws and will not violate any PRC laws or regulations currently in effect.

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 July 30, 2013 upon its inception, 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.

As of December 31, 2015, Asia Cloud Investment and its subsidiary, Asia Cloud Technology, had not commenced any significant operations except for investments in certain floating rate principal unguaranteed securities with an aggregate amount of RMB102,300. The two entrusted loans from Bank of Dongguan and related interests were fully repaid in August and September 2015 (Note 14). Asia Cloud Investment ceased to be a VIE following such repayment in 2015.

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. As of December 31, 2016, such mandatorily redeemable NCI has been fully repaid.

(d)

VIE disclosures

Except for certain property with carrying amounts of RMB335,491 (US$48,321) 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.

(e)

Variable interests in a VIE

As at December 31, 2016, the Company held variable interest in an entity that does not have sufficient equity at risk where the Company is not the VIE’s primary beneficiary to consolidate the VIE. The Company’s maximum exposure to such an arrangement is RMB56,713.

The following tables represent the financial information of the Consolidated VIEs as of December 31, 2015 and 2016 and for the years ended December 31, 2014, 2015 and 2016 before eliminating the intercompany balances and transactions between the Consolidated VIEs and other entities within the Group:


	As of December 31,
	2015		2016
	RMB		RMB		US$
ASSETS
Current assets:
Cash and cash equivalents		391,182		239,874		34,549
Restricted cash		135,875		68,709		9,896
Accounts receivable (net of allowance for doubtful debt of RMB39,010 and RMB80,313 (US$11,567) as of December 31, 2015 and 2016, respectively)		630,582		555,509		80,010
Inventories		13,115		4,320		622
Short-term investments		102,300		—		—
Prepaid expenses and other current assets		548,061		636,776		91,715
Deferred tax assets		29,029		40,751		5,869
Amounts due from related parties		55,503		82,350		11,861

Total current assets		1,905,647		1,628,289		234,522

Non-current assets:
Property and equipment, net		2,226,653		2,501,578		360,302
Intangible assets, net		810,171		555,649		80,030
Land use rights, net		64,682		76,044		10,953
Goodwill		1,146,570		1,146,570		165,140
Deferred tax assets		44,688		56,312		8,111
Other non-current assets		153,772		112,822		16,250
Long-term investments		164,454		266,748		38,420

Total non-current assets		4,610,990		4,715,723		679,206

Total assets		6,516,637		6,344,012		913,728

Current liabilities:
Short-term bank borrowings		276,000		183,676		26,455
Accounts and notes payable		416,850		441,847		63,639
Accrued expenses and other payables		435,912		525,613		75,704
Advance from customers		185,800		201,397		29,007
Income tax payable		43,949		25,466		3,668
Deferred revenue		332,091		311,191		44,821
Amount due to inter-companies ⁽¹⁾		890,988		1,221,897		175,990
Amount due to related parties ⁽²⁾		48,762		53,295		7,676
Current portion of capital lease obligation		123,694		203,394		29,295
Current portion of long-term bank borrowings		12,422		12,564		1,810
Deferred government grants		6,332		5,107		736

Total current liabilities		2,772,800		3,185,447		458,801

Non-current liabilities:
Amount due to inter-companies		1,080,118		1,052,734		151,625
Long-term bank borrowings		27,534		219,055		31,550
Non-current portion of capital lease obligations		543,503		581,568		83,763
Unrecognized tax benefits		11,098		24,153		3,479
Deferred tax liabilities		218,522		182,877		26,340
Deferred government grants		31,288		25,886		3,728
Deferred revenue		68,535		62,531		9,006
Mandatorily redeemable noncontrolling interests		100,000		—		—

Total non-current liabilities		2,080,598		2,148,804		309,491

Total liabilities		4,853,398		5,334,251		768,292


	For the Years Ended December 31,
	2014		2015			2016
	RMB		RMB			RMB			US$
Net revenues		2,695,021		3,066,090			2,938,319			423,206
Net profit (loss)		175,521		(35,811	)		(674,685	)		(97,175	)


	For the Years Ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Net cash provided by operating activities		434,865			270,358			141,364			20,361
Net cash (used in) provided by investing activities		(808,117	)		105,635			(470,955	)		(67,832	)
Net cash provided by (used in) financing activities		480,045			(354,408	)		178,283			25,678
Net increase (decrease) in cash and cash equivalents		106,793			21,585			(151,308	)		(21,793	)

(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 RMB34,603 and RMB33,792 (US$4,867) to 21Vianet China for accrued service fees as of December 31, 2015 and 2016, respectively. Service fees paid by the Consolidated VIEs to 21Vianet China and were nil, RMB35,292 and nil for the years ended December 31, 2014, 2015 and 2016, respectively.

(2)

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

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2016

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 assets acquisition and the subsequent impairment assessment of long-lived assets and related goodwill, accounting for investments and the subsequent impairment assessment, determining the provision for accounts and other 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 loss.

(e)

Convenience translation

Amounts in US$ are presented for the convenience of the reader and are translated at the noon buying rate of US$1.00 to RMB6.9430 on December 30, 2016 in the City of New York for cable transfers of RMB as certified for customs purposes by the Federal Reserve Bank of New York. No representation is made that the RMB amounts could have been, or could be, converted into US$ 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, 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) and the guarantee of notes payable.

(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, floating rate principal guaranteed investments and floating rate principal unguaranteed 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 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 investments are reported at fair value, with unrealized gains and losses recorded in accumulated other comprehensive 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, 2015 and 2016.

(i)

Accounts receivable and allowance for doubtful debt

Accounts receivable are carried at net realizable value. An allowance for doubtful debt 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 RMB7,199, RMB23,780 and RMB12,781 (US$1,841) for the years ended December 31, 2014, 2015 and 2016, 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 and the research staff costs directly associated with the internal-develop 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 RMB8,333, RMB5,772 and RMB394 (US$57) for the years ended December 31, 2014, 2015 and 2016, respectively. The unamortized amount of capitalized internal use software development costs was RMB27,619 and RMB40,006 (US$5,762) as of December 31, 2015 and 2016, respectively.

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


Purchased software			3.4 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
Internally use software			7 years
Property management relationship*			9 years

Acquired in the acquisitions of subsidiaries.

(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 investments 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, 2015 and 2016.

(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, 2015 and 2016 were mainly related to its acquisitions of the Managed Network Entities, Fastweb, iJoy, Aipu Group and Dermot Entities. 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. As of December 31, 2015, the Company had one single 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. Immediately upon the change in segment reporting in 2016, there were two reporting units consisting of two service lines namely Hosting and related services and Managed network services. The goodwill was reassigned to the two reporting units using a relative fair value allocation approach.

In 2016, the Company elected to assess goodwill for impairment using the two-step process. As of October 1, 2016, 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 2016. Similarly, pursuant to the goodwill impairment tests in 2014 and 2015, 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.

In 2016, due to the deterioration of the operating results of one of the Company’s asset group, the Company recognized an impairment loss based on the excess of the carrying amount of the asset group over its fair value. The Company determined the fair value of the asset group using the income approach based on the discounted expected cash flows associated with the asset group. The discounted cash flows for the asset group were based on eight year projections which is consistent with the remaining useful lives of its principal assets. Cash flow projections were based on past experience, actual operating results and management best estimates about future developments as well as certain market assumptions. 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 impairment loss reduced the carrying amount of the long-lived assets of a group on a pro-rata basis using the relative carrying amount of those assets.

The Company recorded impairment charges associated with its long-lived assets and acquired intangibles as follows:


	Years ended December 31,
	2014		2015		2016
	RMB		RMB		RMB		US$
Impairment of property and equipment		—		—		238,144		34,300
Impairment of intangible assets		—		—		154,803		22,296

(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, long-term bank and other borrowings, available-for-sale investments, share-settled bonuses, liability-classified restricted share units, 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 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. In 2016, the mandatorily redeemable noncontrolling interest was fully settled.

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, 2016, the fair value of the bonds payable was RMB418,497 (US$60,276) (Note 30).

(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 which the selling price of each deliverable is 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 the Company is 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, 2014 and 2015 amounted to RMB25,202 and RMB6,394. Effective since June 2014, VAT of 6% replaced the original business tax for all telecommunication services provided in Mainland China. There was no business tax expense charged in 2016 and afterwards.

(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.

(t)

Advertising expenditures

Advertising expenditures are expensed as incurred and are included in sales and marketing expenses, which amounted to RMB19,687, RMB26,360 and RMB20,420 (US$2,941) for the years ended December 31, 2014, 2015 and 2016, 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 consolidated 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 consolidated 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, 2014, 2015 and 2016.

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, 2014, 2015 and 2016, was as follows:


	2014			2015			2016
	RMB			RMB			RMB			US$
Interest expense and amortization cost of bonds		130,355			172,677			113,367			16,328
Interest expense on bank and other borrowings		66,699			55,391			46,377			6,680
Interest expense on capital lease		40,849			57,189			66,687			9,605

Total interest costs		237,903			285,257			226,431			32,613
Less: Total interest costs capitalized		(5,883	)		(11,073	)		(27,842	)		(4,010	)

Interest expense, net		232,020			274,184			198,589			28,603

(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 (“Share-Settled Bonus”), 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 will be reclassified to additional paid in capital and recognized over the remaining lock-up period using the accelerated method, respectively.

A cancellation of the terms or conditions of an equity award under original award in exchange for a new award should be treated as modification. The compensation costs associated with the modified awards are recognized if either the original vesting conditions or the new vesting conditions have been achieved. Total recognized compensation cost for the awards is at least equal to the fair value of the original awards at the grant date unless at the date of the modification the performance or service conditions of the original awards are not expected to be satisfied. The incremental compensation cost is measured as the excess of the fair value of the replacement awards over the fair value at the modification date. Therefore, in relation to the modified awards, the Company recognizes share-based compensation over the vesting periods of the new awards, which comprises (i) the amortization of the incremental portion of share-based compensation over the remaining vesting term, and (ii) any unrecognized compensation cost of original awards, using either the original term or the new term, whichever results in higher expenses for each reporting period. For modification of a liability award that remains a liability after modification, the liability award continues to be remeasured at fair value at each reporting date.

On April 15, 2016 (“the Modification date”), the Company made revisions to the Share-Settled Bonus to remove the agreed premium and six month lock-up period for the employees above a specified level and the option to settle in share for the employees below a specified level. The modified awards remain as liabilities in accordance with ASC 718 as the Company can only settle the Share-Settled Bonus by issuing variable number of shares until the settlement date or in cash.

On November 26, 2016, the Board approved a new incentive program to replace unvested RSUs to certain individuals with a new bonus scheme which will be settled by issuing a variable number of shares with a fair value equal to fixed dollar amount on the settlement date. The modification was treated as an equity to liability modification in accordance with ASC 718. 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 number of underlying shares were fixed and recorded the incremental cost over the remaining vesting term and the unrecognized compensation of original awards using the new term.

The Company elected to estimate forfeitures 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 subsequent periods. During the years ended December 31, 2014, 2015 and 2016, the Company estimated that the forfeiture rate for both the management and non-management employees of the Company was 1.66%, 1.10% and 1.81%.

(aa)

Loss per share

In accordance with ASC 260, Earnings per Share, basic loss per share is computed by dividing net loss attributable to ordinary shareholders by the weighted average number of unrestricted ordinary shares outstanding during the year. Diluted loss 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 loss per share 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 loss per share 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 loss per share 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 to 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 a 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 loss per share if their effects would be anti-dilutive.

(bb)

Share repurchase program

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, 2016, the Company repurchased 2,368,610 ADSs, under this plan for a consideration of approximately RMB256,330.

The Company accounted for the repurchased shares as Treasury Stock at cost in accordance to ASC 505-30, Treasury Stock, and the share repurchase is shown separately in the consolidated 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 accumulated deficit.

(cc)

Comprehensive loss

Comprehensive loss is defined as the 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

In accordance with ASC 280 “Segment Reporting” (“ASC 280”), the Company historically had only one single reportable segment since the Company’s chief executive officer, who has been identified as the Company’s chief operating decision-maker (“CODM”) formerly relied on the consolidated results of operations when making decisions on allocating resources and assessing performance of the Company. On October 1, 2016, the Company changed its reportable segments as the CODM now reviews the operating result of two different services in order to allocate resources and assess performance of the Company. The operations of the Company are organized into two segments, consisting of the Hosting and related services and Managed network services . Hosting and related services business focuses primarily on colocation, interconnectivity, cloud, VPN, hybrid IT and other value-added services. Managed network services focuses on businesses that primarily utilize bandwidth such as CDN service, hosting area network services and last-mile wired broadband service.

The Company has restated the presentation of its reportable segments for prior years to conform with the current year’s presentation.

(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)

Comparatives

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 Financial Accounting Standards Board (“FASB”) issued ASU No. 2014-09 (“ASU 2014-09”), Revenue from Contracts with Customers. ASU 2014-09 supersedes the revenue recognition requirements in ASC 605, and requires entities to recognize revenue when it transfers promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for those goods or services. ASU 2014-09 is originally effective for the annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. ASU No. 2015-14, Revenue from Contracts with Customers (“ASU- 2015-14”), defers the effective date of ASU 2014-09 by one year. As a result, ASU 2014-09 is effective for annual reporting periods beginning after December 15, 2017 and interim periods therein.

Early adoption is permitted to the original effective date. The Company is currently evaluating the timing of its adoption and the impact of adopting the new revenue standard on its consolidated financial statements and considering additional disclosure requirements.

In November 2015, the FASB issued ASU No. 2015-17 (“ASU 2015-17”), Income Taxes (Topic 740): Balance Sheet Classification of Deferred Taxes, which simplifies the presentation of deferred income taxes by requiring deferred tax assets and liabilities be classified as noncurrent on the balance sheet. The amendments in this update are effective for financial statements issued for annual periods beginning after December 15, 2016, and interim periods within those annual periods. All short-term deferred tax assets and liabilities will be reclassified to long-term assets and liabilities upon adoption of this update. The Group is currently evaluating the impact on its consolidated financial statements of adopting this guidance.

In January 2016, the FASB issued ASU No. 2016-01 (“ASU 2016-01”), Financial Instruments. ASU 2016-01 requires equity investments (except those accounted for under the equity method of accounting or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. An entity may choose to measure equity investments that do not have readily determinable fair values at cost minus impairment, if any, plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment of the same issuer. ASU 2016-01 also simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment. When a qualitative assessment indicates that impairment exists, an entity is required to measure the investment at fair value. For public business entities, the amendments are effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of adopting this standard on its consolidated financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (“ASU 2016-02”). ASU 2016-02 specifies the accounting for leases. For operating leases, ASU 2016-02 requires a lessee to recognize a right-of-use asset and a lease liability, initially measured at the present value of the lease payments, in its balance sheet. The standard also requires a lessee to recognize a single lease cost, calculated so that the cost of the lease is allocated over the lease term, on a generally straight-line basis. ASU 2016-02 is effective for public companies for annual reporting periods and interim periods within those years beginning after December 15, 2018. Early adoption is permitted. The Company is currently evaluating the impact of adopting ASU 2016-02 on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-08, Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net), (“ASU 2016-08”) which clarifies the implementation guidance on principal versus agent considerations. The guidance includes indicators to assist an entity in determining whether it controls a specified good or service before it is transferred to the customers. This guidance will be effective for the company in the first quarter of 2018, with the option to adopt it in the first quarter of 2017. The Group is still evaluating the effect if any, that this guidance will have on its consolidated financial statements. In June 2016, the FASB issued ASU No. 2016-13 (“ASU 2016-13”), Financial Instruments—Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments. ASU 2016-13 changes the impairment model for most financial assets and certain other instruments. The standard will replace “incurred loss” approach with an “expected loss” model for instruments measured at amortized cost. For available-for-sale investments, entities will be required to record allowances rather than reduce the carrying amount, as they do today under the other-than-temporary impairment model. The standard is effective for public business entities for annual periods beginning after December 15, 2019, and interim periods therein. Early adoption is permitted. The Company is currently evaluating the impact of adopting this standard on its consolidated financial statements.

In March 2016, the FASB issued ASU No. 2016-09, Improvements to Employee Share-Based Payment Accounting (“ASU 2016-09”). The amendments in ASU 2016-09 simplify several aspects of the accounting for employee share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. For public business entities, ASU 2016-09 is effective for annual periods beginning after December 15, 2016 and interim periods within those annual periods. The Company does not expect the implementation of this standard to materially impact its future stock-based compensation expense.

In August 2016, the FASB issued ASU No. 2016-15, Statement of cash flows—Classification of Certain Cash Receipts (“ASU 2016-15”). The amendments in ASU 2016-15 addresses eight specific cash flow issues, including debt prepayment or debt extinguishment costs, settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowing, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies (COLIs) (including bank-owned life insurance policies (BOLIs)), distributions received from equity method investees, beneficial interests in securitization transactions and separately identifiable cash flows and application of the predominance principle. For public business entities, ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, and interim periods within those fiscal years. The Company is currently evaluating the impact of adopting this standard on its consolidated financial statements.

In November 2016, the FASB issued Accounting Standards Update No. 2016-18 (“ASU 2016-18”), Statement of Cash Flows (Topic 230): Restricted Cash. ASU 2016-18 requires companies to include amounts generally described as restricted cash and restricted cash equivalents in cash and cash equivalents when reconciling beginning-of-period and end-of-period total amounts shown on the statement of cash flows. This standard is effective for public business entities in the first quarter of 2018. Early adoption is permitted. The Company is currently evaluating the effect that this guidance will have on our consolidated financial statements and related disclosures.

In January 2017, FASB has issued ASU No. 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, clarifying the definition of a business. The ASU affects all companies and other reporting organizations that must determine whether they have acquired or sold a business. The definition of a business affects many areas of accounting including acquisitions, disposals, goodwill, and consolidation. The ASU is effective for annual periods beginning after December 15, 2017, including interim periods within those periods. The Company is currently evaluating the impact that the adoption of this standard will have on its consolidated financial statements.

In January 2017, the FASB issued Accounting Standards Update No. 2017-04(“ASU 2017-04”), Intangibles—Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. ASU 2017-04 eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value. This standard is effective for public business entities in the first quarter of 2020. Early adoption is permitted. The Company is currently evaluating the effect that this guidance will have on our consolidated financial statements and related disclosures.

Concentration of Risks

12 Months Ended

Dec. 31, 2016

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, 2015 and 2016, the aggregate amount of cash and cash equivalents, restricted cash and short-term investments of RMB969,476 and RMB489,646 (US$70,524), respectively, were held at major financial institutions located in the PRC, and US$176,637 and US$444,019 (RMB3,082,823), 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 center 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 21%, 15% and 19% of the Company’s total bandwidth and cabinet resources for the years ended December 31, 2014, 2015 and 2016, 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 the year ended December 31, 2016. 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 2% of the Company’s revenues in any given year but in the aggregate, they contributed approximately 7%, 6% and 4% of the Company’s total revenues for the years ended December 31, 2014, 2015 and 2016, 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 depreciation of the RMB against US$ was approximately 0.4%, 6.1% and 6.8% in the years ended December 31, 2014, 2015 and 2016, respectively.

Acquisitions

12 Months Ended

Dec. 31, 2016

Business Combinations [Abstract]

Acquisitions

4.	ACQUISITIONS

Assets acquisition in 2016:

On July 7, 2016, the Company through its subsidiary, 21Vianet HK acquired 100% equity interests in Dynamic Ruby Limited with a total consideration of RMB73,150 (US$10,535). The purpose of this transaction for the Company is to acquire the land use right and a building to establish a new data center from FS Zhuoyi. As FS Zhuoyi 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. The fair values of the net identifiable assets of FS Zhuoyi at the acquisition day are as follows:


	RMB			US$
Net assets acquired:
Land use right		92,650			13,344
Property		50,950			7,338
Cash and cash equivalents		5,672			817
Other current assets		21			3
Other current liabilities		(51,386	)		(7,401	)
Deferred tax liabilities		(24,757	)		(3,566	)

Total consideration in cash		73,150			10,535

Business combinations before 2016:

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, as follow:


	RMB
Cash consideration (i)		700,000
Contingent consideration in cash* (ii)		48,971

Total fair value of purchase price consideration		748,971

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, 2015 and 2016 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). In 2016, since Aipu failed to meet the operational performance target, the contingent consideration amounted to RMB57,700 was reversed as of December 31, 2016.

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 choice to settle in cash or shares residing with the Company for the first tranche and the Selling Shareholders 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 was 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 non-controlling 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 non-controlling interests (Note 29). The redeemable noncontrolling interests were initially recorded at the higher of 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, which is capped within the aforementioned range. Adjustments to the carrying amount of redeemable noncontrolling interests pursuant to ASC 480, if any, are charged to additional paid-in capital.

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.


	RMB
Cash consideration (i)		598,500
Contingent ordinary shares issuance * (ii) (iii)		355,067

Total fair value of purchase price consideration		953,567

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 year 2015 has been recorded in the “Amount due to related parties” balance within the Company’s consolidated balance sheets.

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 contingent consideration related to fiscal year 2014 and 2015 has been resolved and remeasured in April 2015 and April 2016, with its fair value of RMB210,000 and RMB210,000 reclassified to additional paid in capital, respectively. The Company issued 1,923,556 ADS in April 2015 and 1,618,251 ADS in May 2016 in relation to this, respectively.

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)).

Other acquisitions

As part of the Company’s business strategy to expand the existing hosting service, the Company completed other several non-significant acquisitions in 2014. The aggregate consideration for the three acquisitions is RMB64,232, as follow:


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

Total fair value of purchase price consideration		64,232

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.

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 contingent consideration related to fiscal year 2014 has been resolved and remeasured in September 2015, with its fair value of RMB4,543 reclassified to additional paid in capital. The Company subsequently issued 225,262 Shares in September 2015 for the contingent consideration related to GD Tianying’s 2014 performance.

As the financial and/or operational targets for fiscal year 2015 were not achieved, the corresponding portion of the contingent consideration of RMB9,455 was reversed and recognized as a gain as of December 31, 2015.

As of December 31, 2015, the Company was in the process of negotiation with the seller of GD Tianying on the gross value of the contingent consideration related to fiscal year 2016. 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 cash and shares of RMB16,350, as determined based on the remeasured amount of December 31, 2015, is accrued as a contingent payable pursuant to ASC 450, Contingencies.

As the financial and/or operational targets for fiscal year 2016 were not achieved, the corresponding portion of the contingent consideration of RMB16,350 was reversed and recognized as a gain in the current period expense.

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).

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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Accounts and Notes Receivable, Net

Accounts and Notes Receivable, Net

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

5.	ACCOUNTS AND NOTES RECEIVABLE, NET

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


	December 31,
	2015			2016
	RMB			RMB			US$
Accounts receivable		733,558			735,154			105,884
Notes receivable		620			1,215			175

Allowance for doubtful debt		(40,070	)		(80,910	)		(11,653	)

		694,108			655,459			94,406

As of December 31, 2015 and 2016, all accounts and notes receivable were due from third party customers.

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


	December 31,
	2015			2016
	RMB			RMB			US$
Balance at beginning of the year		10,416			40,070			5,771
Provision		30,751			79,637			11,470
Write-off of accounts receivable		(1,097	)		(38,797	)		(5,588	)

Balance at the end of the year		40,070			80,910			11,653

Additions to the Company’s allowance for doubtful debt were recorded within allowance for doubtful debt for the years ended December 31, 2014, 2015 and 2016.

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, 2016

Short-Term Investments

6.	SHORT-TERM INVESTMENTS

Short-term investments consisted of the following as of December 31, 2015 and 2016:


	December 31,
	2015		2016
	RMB		RMB		US$
Held-to-maturity securities
- Fixed rate time deposits		—		277,946		40,033
- Floating rate principal unguaranteed investments		102,300		—		—

		102,300		277,946		40,033

The Company recorded interest income related to its short-term investments amounting to RMB50,882, RMB37,652 and RMB1,148 (US$165) for the years ended December 31, 2014, 2015 and 2016, respectively, in the consolidated statements of operations. There were no unrealized gains or losses as of December 31, 2014, 2015 and 2016.

Inventories

12 Months Ended

Dec. 31, 2016

Inventory Disclosure [Abstract]

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

7.	INVENTORIES

Inventories consisted of the following as of December 31, 2015 and 2016:

December 31,

2015

2016

RMB

US$

Broadband related products

13,539

4,431

638

Prepaid Expenses and Other Current Assets

12 Months Ended

Dec. 31, 2016

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,
	2015		2016
	RMB		RMB		US$
Prepaid expenses for bandwidth, rented data centers or cabinets		126,842		163,443		23,541
Staff field advances		20,819		22,429		3,230
Interest receivables		4,936		13,576		1,955
Receivables for the disposal of certain construction-in-progress		20,290		20,290		2,922
Tax recoverables		159,413		309,426		44,567
Deposits		18,191		19,596		2,822
Loan to third parties		119,244		62,433		8,992
Other receivables		172,818		165,938		23,901

		642,553		777,131		111,930

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

Property and Equipment, Net

12 Months Ended

Dec. 31, 2016

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,
	2015			2016
	RMB			RMB			US$
At cost:
Property		439,480			490,430			70,637
Leasehold improvements		398,473			666,051			95,931
Computer and network equipment		2,556,403			2,926,278			421,472
Optical fibers		207,423			207,423			29,875
Office equipment		19,554			19,591			2,822
Motor vehicles		8,289			8,144			1,173

		3,629,622			4,317,917			621,910
Less: accumulated depreciation		(1,088,684	)		(1,342,041	)		(193,294	)
Impairment		—			(238,144	)		(34,300	)

		2,540,938			2,737,732			394,316
Construction-in-progress		1,112,133			1,043,881			150,350

		3,653,071			3,781,613			544,666

Depreciation expense was RMB278,986, RMB402,035 and RMB480,105 (US$69,150) for the years ended December 31, 2014, 2015 and 2016, respectively, and were included in the following captions:


	For the years ended December 31,
	2014		2015		2016
	RMB		RMB		RMB		US$
Cost of revenues		225,680		328,217		397,014		57,182
Sales and marketing expenses		3,397		5,670		3,759		541
General and administrative expenses		19,433		29,753		45,746		6,590
Research and development expenses		30,476		38,395		33,586		4,837

		278,986		402,035		480,105		69,150

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


	December 31,
	2015			2016
	RMB			RMB			US$
Property		365,353			365,353			52,622
Computer and network equipment		289,346			431,948			62,213
Optical fibers		207,423			207,423			29,875

		862,122			1,004,724			144,710
Less: accumulated depreciation		(138,608	)		(238,765	)		(34,389	)

		723,514			765,959			110,321
Construction-in-progress		142,671			35,906			5,172

		866,185			801,865			115,493

Depreciation of property, computer and network equipment and optical fibers under capital leases was RMB22,302, RMB64,371 and RMB100,157 (US$14,426), for the years ended December 31, 2014, 2015 and 2016, respectively.

The carrying amounts of property, computer and network equipment and construction-in-progress pledged by the Group to secure banking borrowings (Note 14) granted to the Group at the respective balance sheet dates were as follows:


	December 31,
	2015		2016
	RMB		RMB		US$
Property		22,118		7,938		1,143
Computer and network equipment		37,167		31,506		4,538
Construction-in-progress		—		318,259		45,839

Intangible Assets, Net

12 Months Ended

Dec. 31, 2016

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*			Internal use software			Property management relationship*			Total
	RMB			RMB						RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB
Intangible assets, net January 1, 2015		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
Additions		22,706			—			—			—			—			—			—			—			—			—			23,780			—			46,486
Disposals		—			—			—			—			—			—			—			—			—			—			(243	)		—			(243	)
Foreign currency translation difference		380			7,237			—			—			—			—			—			—			—			—			—			—			7,617
Amortization expense		(15,647	)		(9,730	)		(1,000	)		(6,588	)		(81,783	)		(1,266	)		(25,277	)		(17,908	)		(3,829	)		(5,694	)		(5,772	)		(9,653	)		(184,147	)

Intangible assets, net December 31, 2015		74,471			93,387			16,834			24,926			595,648			16,519			115,727			211,189			7,753			18,504			27,619			71,589			1,274,166
Additions		26,763			—			—			—			—			—			—			—			—			—			12,781			—			39,544
Disposals		(6,531	)		—			—			—			—			—			—			—			—			—			—			—			(6,531	)
Foreign currency translation difference		1,814			7,115			—			—			—			—			—			—			—			—			—			—			8,929
Amortization expense		(23,072	)		(8,934	)		(1,000	)		(6,588	)		(80,349	)		(1,266	)		(25,277	)		(17,908	)		(3,829	)		(5,694	)		(394	)		(9,653	)		(183,964	)
Impairment		—			—			—			—			(102,524	)		(2,696	)		(2,007	)		(24,896	)		—			(3,907	)		—			(18,773	)		(154,803	)

Intangible assets, net December 31, 2016		73,445			91,568			15,834			18,338			412,775			12,557			88,443			168,385			3,924			8,903			40,006			43,163			977,341

Intangible assets, net December 31, 2016 (US$)		10,578			13,189			2,281			2,641			59,452			1,809			12,738			24,252			565			1,282			5,762			6,217			140,766

*	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 WiFire BJ 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 mainly relate to the trade names of 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 RMB127,669, RMB184,147 and RMB183,964 (US$26,496) for the years ended December 31, 2014, 2015 and 2016, respectively.

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


	RMB		US$
2017		198,732		28,623
2018		182,642		26,306
2019		164,766		23,731
2020		134,359		19,352
2021		124,878		17,986

		805,377		115,998

Land Use Rights, Net

12 Months Ended

Dec. 31, 2016

Text Block [Abstract]

Land Use Rights, Net

11.

LAND USE RIGHTS, NET

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


	December 31,
	2015			2016
	RMB			RMB			US$
Cost		66,878			172,658			24,868
Accumulated amortization		(2,196	)		(5,012	)		(722	)

Land use rights, net		64,682			167,646			24,146

The carrying amounts of land use rights pledged by the Group to secure banking borrowings (Note14) granted to the Group at the respective balance sheet dates were as follows:

December 31,

2015

2016

RMB

US$

Land use rights

—

17,232

2,482

Goodwill

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

12.

GOODWILL

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


	December 31,
	2014		2015		2016
	RMB		RMB		RMB		US$
Balance as of January 1		410,500		1,755,970		1,755,970		252,912
Goodwill acquired		1,345,470		—		—		—

Balance as of December 31		1,755,970		1,755,970		1,755,970		252,912

As of December 31, 2016, the Company has two reporting units. Goodwill from acquisition was allocated to the two reporting units accordingly. Following table summarizes the allocated goodwill by each reporting unit:


	RMB		US$
Hosting and related services		989,530		142,522
Managed network services		766,440		110,390

		1,755,970		252,912

No impairment charge was recorded in any of the three years ended December 31, 2014, 2015 and 2016.

Long-Term Investments

12 Months Ended

Dec. 31, 2016

Accrued Expenses And Other Payables

Long-Term Investments

13.

LONG-TERM INVESTMENTS

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


	December 31,
	2015		2016
	RMB		RMB		US$
Cost method investments		48,696		56,087		8,078
Equity method investments		150,211		234,863		33,827
Available-for-sale investments		2,597		7,921		1,141

		201,504		298,871		43,046

Cost method investments

The Group disposed one of cost method investments of nil and RMB6,109 (US$880) in the consolidated statement of comprehensive loss for the years ended December 31, 2015 and 2016, respectively. The investment income of nil and RMB5,160 (US$743) was recognized in other income in the consolidated statements of comprehensive loss for the years ended December 31, 2015 and 2016, respectively. There were no impairment loss recognized for these cost method investments as of December 31, 2016.

Investment in equity investees

As of December 31, 2014

Decrease during the year
ended December 31, 2015

As of December 31, 2015

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

101,000

(3,144

)

97,856

—

52,355

101,000

49,211

150,211


	As of December 31, 2015						Increase during the year ended December 31, 2016					As of December 31, 2016
	Cost of investment		Share equity loss		Investment in equity investee		Cost of investment		Share equity gain			Cost of investment		Share equity gain			Investment in equity investee		Investment in equity investee
	RMB		RMB		RMB		RMB		RMB			RMB		RMB			RMB		US$
Yizhuang Fund		101,000		49,211		150,211		—		35,937			101,000		85,148			186,148		26,811
Unis Tech		—		—		—		49,000		(285	)		49,000		(285	)		48,715		7,016

		101,000		49,211		150,211		49,000		35,652			150,000		84,863			234,863		33,827

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 with an amount of RMB50,500. In December 2013, the Company made the second tranche of investment of another amount of RMB50,500 in the Yizhuang Fund, and held 27.694% of the investee as of December 31, 2014, 2015 and 2016. 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.

In June 2016, the Company through its subsidiary, 21Vianet Beijing, and a related company jointly set up Unisplendour-Vianet Technology Inc. (“Unis Tech”). The Company injected capital of RMB49,000 (US$7,057) to acquire 49% of equity interest in Unis Tech with the ability to exercise significant influence.

There were no indicators of impairment noted for this equity method investments as of December 31, 2016.

Available-for-sale investments

Available-for-sale investments consist of investments in convertible notes with conversion option to ordinary shares that are not readily convertible to cash and therefore the bifurcation of embedded derivative is not required as the conversion option did not qualify as derivatives in accordance with ASC 815 “Derivatives and Hedging “.

Debt Disclosure

12 Months Ended

Dec. 31, 2016

Bank Borrowings

Debt Disclosure

14.

BANK BORROWINGS

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


	December 31,
	2015		2016
	RMB		RMB		US$
Short-term bank borrowings		276,000		1,683,676		242,500
Long-term bank borrowings, current portion		38,803		39,303		5,661

		314,803		1,722,979		248,161
Long-term bank borrowings, non-current portion		103,421		268,221		38,632

Total bank borrowings		418,224		1,991,200		286,793

The short-term bank borrowings outstanding as of December 31, 2015 and 2016 bore a weighted average interest rate of 5.69% and 4.22% 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, 2015 and 2016 bore a weighted average interest rate of 6.59% and 5.85% per annum, and were denominated in RMB and HK$. These loans were obtained from financial institutions located in the PRC and Hong Kong.

As of December 31, 2015 and December 31, 2016, unused loan facilities for bank borrowings amounted to RMB414,000 and RMB766,000 (US$110,327), respectively.

Bank borrowings as of December 31, 2015 and 2016 were secured/guaranteed by the following:

December 31, 2015


Short-term bank borrowings		Secured/guaranteed by
(RMB)
	50,000	Guaranteed by restricted cash of RMB51,553.
	11,000	Secured by a subsidiary’s building with net book value of RMB13,943 (Note 9).
	215,000	Unsecured borrowings.

	276,000


Long-term bank and other borrowings (including current portion)		Secured/guaranteed by
(RMB)
	16,956	Guaranteed by noncontrolling shareholder of Aipu Group
	4,800	Secured by a subsidiary’s building with net book value of RMB8,175 (Note 9).
	16,778	Secured by a subsidiary’s computer and network equipment with net book value of RMB37,167 (Note 9).
	103,690	Unsecured borrowings.

	142,224

December 31, 2016


Short-term bank borrowings		Secured/guaranteed by
(RMB)
	1,520,000	Guaranteed by restricted cash of RMB1,751,055.
	20,000	Guaranteed by noncontrolling shareholder of Aipu Group.
	143,676	Unsecured borrowings.

	1,683,676


Long-term bank borrowings (including current portion)		Secured/guaranteed by
(RMB)
	1,600	Secured by a subsidiary’s building with net book value of RMB7,938 (Note 9).
	13,817	Secured by a subsidiary’s computer and network equipment with net book value of RMB31,506 (Note 9).
	164,000	Secured by a subsidiary’s construction-in-progress and land use rights with net book value of RMB335,491(Note 9/Note 11).
	128,107	Unsecured borrowings.

	307,524

Bonds Payable

Debt Disclosure

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 were due and fully repaid in March 2016.

On June 26, 2014, the Company issued and sold bonds with an aggregate principal amount of RMB2,000,000 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, were RMB1,980,640. 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 accounts payable) of the Company’s subsidiaries and Consolidated VIEs.

In August 2016, the Company repurchased 78.97% of the outstanding 2017 Bonds with the total principal amount of RMB1,579,400 (US$227,481). Payment of accrued interests was RMB18,742 (US$2,702). The debt extinguishment loss amounting to RMB29,841 (US$4,298) was recognized in earnings upon the repurchase.

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


	RMB		US$
For the years ending December 31,
2017		2,143,579		308,741
2018		69,841		10,059
2019		73,380		10,569
2020		45,500		6,553
2021		39,000		5,617
Thereafter		40,500		5,833

Accrued Expenses And Other Payables

12 Months Ended

Dec. 31, 2016

Payables and Accruals [Abstract]

15.

ACCRUED EXPENSES AND OTHER PAYABLES

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


	December 31,
	2015		2016
	RMB		RMB		US$
Payroll and welfare payables		193,356		248,895		35,848
Business and other taxes payable		25,780		21,011		3,026
Payables for office supplies and utilities		25,497		31,006		4,466
Payables for the purchase of property and equipment		218,165		266,597		38,398
Payable for purchase intangible assets		3,662		2,352		339
Accrued service fees		68,029		74,812		10,775
Interest payables		19,102		6,456		930
Share-settled bonuses		41,352		72,138		10,390
Payable for assets acquisition		21,080		25,268		3,639
Others		21,934		39,381		5,673

		637,957		787,916		113,484

Capital Leases

12 Months Ended

Dec. 31, 2016

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$
2017		301,823			43,472
2018		188,679			27,175
2019		94,045			13,545
2020		50,525			7,277
2021 and thereafter		681,773			98,196

Total minimum lease payments		1,316,845			189,665
Less: amount representing interest		(536,499	)		(77,272	)

Present value of remaining minimum lease payments		780,346			112,393

Capital leases had weighted average interest rates of 10.03% and 9.76% for the years ended December 31, 2015 and 2016, respectively.

Deferred Government Grants

12 Months Ended

Dec. 31, 2016

Deferred Revenue Disclosure [Abstract]

Deferred Government Grants

18.

DEFERRED GOVERNMENT GRANTS

During the years ended December 31, 2014, 2015 and 2016, the Company received RMB20,920, RMB10,160 and nil, respectively, in government grants from the relevant PRC government authorities. The government grants received during the year ended December 31, 2014, 2015 and 2016 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,
	2014			2015			2016
	RMB			RMB			RMB			US$
Balance at beginning of the year		18,046			33,572			37,620			5,418
Additions		20,920			10,160			—			—
Recognized as a reduction of depreciation expense		(5,394	)		(6,112	)		(6,627	)		(954	)

Balance at end of the year		33,572			37,620			30,993			4,464

Treasury Stock

12 Months Ended

Dec. 31, 2016

Treasury Stock

19.

TREASURY STOCK

For the year ended December 31, 2014, 2015 and 2016, the Company repurchased the number of 1,553,085, nil and 815,525 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, 2014, 2015 and 2016, nil, 146,372 and 223,161 ADSs 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) Income

12 Months Ended

Dec. 31, 2016

Accumulated Other Comprehensive (Loss) Income

20.

ACCUMULATED OTHER COMPREHENSIVE (LOSS) INCOME

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


	Foreign currency translation			Total
	RMB			RMB
Balance as of January 1, 2014		(82,589	)		(82,589	)
Current year other comprehensive income		16,835			16,835

Balance as of December 31, 2014		(65,754	)		(65,754	)
Current year other comprehensive income		41,518			41,518

Balance as of December 31, 2015		(24,236	)		(24,236	)
Current year other comprehensive income		142,526			142,526

Balance as of December 31, 2016		118,290			118,290

Balance as of December 31, 2016, in US$		17,037			17,037

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.

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=66004124&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=66004124&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=66004124&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=66004124&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=66004124&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=66004124&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=66004124&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

Mainland China Employee Contribution Plan

Mainland China Employee Contribution Plan

12 Months Ended

Dec. 31, 2016

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 RMB88,102, RMB89,571 and RMB130,630 (US$18,815), respectively, for the years ended December 31, 2014, 2015 and 2016.

Share Based Compensation

12 Months Ended

Dec. 31, 2016

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. The maximum aggregate number of ordinary shares to be issued under 2014 Plan was subsequently amended to 39,606,817, as approved by the Board of Directors and shareholders of the Company on October 30, 2015. 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 3,122,417, 952,178 and 1,059,668 RSUs in 2014, 2015 and 2016, respectively, with performance conditions whereby a predetermined number will vest upon the assignment of an annual performance review 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, 2016, options to purchase 1,987,765 of ordinary shares were outstanding.

The following table summarizes 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, 2016		4,180,198			0.39		6.1
Granted		2,835			0.85
Exercised		(2,195,268	)		0.30
Forfeited		—			—

Outstanding, December 31, 2016		1,987,765			0.49		4.6		1,399

Vested and expected to vest at December 31, 2016		1,987,765			0.49		4.6		1,374

Exercisable as of December 31, 2016		1,984,930			0.47		4.5		1,387

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, 2016, the Company had options outstanding to purchase an aggregate of 1,987,765 shares with an exercise price below the fair value of the Company’s shares, resulting in an aggregate intrinsic value of RMB9,713 (US$1,399).

The aggregate fair value of the outstanding options at the grant date was determined to be RMB18,350 (US$ 2,643) as of December 31, 2016 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, 2014, 2015 and 2016 was nil, nil and US$2, respectively. The total fair value of share options vested during the years ended December 31, 2014, 2015 and 2016 was US$5,488, US$3,111 and nil, respectively. The aggregate intrinsic value of options exercised during the years ended December 31, 2014, 2015 and 2016 was US$15,517, US$15,519, and US$1,906, respectively.

As of December 31, 2016, there was RMB13 (US$2) 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 0.2 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, 2016		1,773,060			19.14		8.6
Granted		646,940			8.85
Vested		(1,159,664	)		12.80
Forfeited/Cancelled⁽¹⁾		(447,638	)		1.56

Unvested, December 31, 2016		812,698			13.25		8.5		16,820

(1)

Cancellation of the terms under original award in exchange for a new award which is treated as modification.

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 RSU, respectively. The aggregate fair value of the unvested RSUs as of December 31, 2016 was RMB116,781 (US$16,820), 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, 2014, 2015 and 2016 was US$23.27, US$18.27 and US$8.85, respectively. The total fair value of RSUs vested during the years ended December 31, 2014, 2015 and 2016 was US$9,774, US$22,801 and US$14,849, respectively.

During 2016, the Company granted 175,555 RSUs to settle the performance bonuses as elected by employees.

As of December 31, 2016, there was RMB129,688 (US$18,679) of unrecognized share-based compensation cost related to RSUs which is expected to be recognized over a weighted-average vesting period of 2.0 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 in “General and administrative expenses” within the Company’s consolidated statements of operations for the year ended December 31, 2014.

(c)

Shares issued to management of Dermot Entities (Note 4)

For the year ended December 31, 2015 and 2016, the Company recorded compensation cost of RMB8,439 and RMB10,871 (US$1,566) within the Company’s consolidated statements of operations, respectively.

Total compensation expense relating to share options and RSUs granted to employees recognized for the years ended December 31, 2014, 2015 and 2016 is as follows:


	For the year ended December 31,
	2014		2015		2016
	RMB		RMB		RMB			US$
Cost of revenues		7,163		12,422		(4,110	)		(592	)
Sales and marketing expenses		13,482		13,488		2,490			359
General and administrative expenses		208,914		153,814		123,273			17,755
Research and development expenses		4,176		10,303		(2,924	)		(421	)

		233,735		190,027		118,729			17,101

Taxation

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Taxation

23.

TAXATION

Enterprise income tax (“EIT”)

Cayman Islands

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, 2014, 2015 and 2016.

Taiwan

DYX Taiwan branch is incorporated in Taiwan and is subject to Taiwan profits tax rate of 17% for the years ended December 31, 2014, 2015 and 2016.

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, 21Vianet Beijing obtained a new certificate, which will expire in October 2017. 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, 2014, 2015 and 2016, 21Vianet Beijing enjoyed 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, 2014, 2015 and 2016, Xi’an Sub enjoyed a preferential tax rate of 15%.

In July 2012, Gehua, a subsidiary located in Guangdong Province, qualified as an HNTE and is eligible for a 15% preferential tax rate effective from 2012 to 2014, and thereafter for an additional three years if it is able to meet the HNTE technical and administrative requirements in those three years. Gehua has successfully renewed the HNTE certificate in 2015. For the years ended December 31, 2014, 2015 and 2016, Gehua enjoyed a preferential tax rate of 15%.

In June 2009, BJ Fastweb, a subsidiary located in Beijing, qualified as an HNTE and is eligible for a 15% preferential tax rate effective from 2009 to 2011, and thereafter for an additional three years if it is able to meet the HNTE technical and administrative requirements in those three years. BJ Fastweb has successfully renewed the HNTE certificate in 2015. For the years ended December 31, 2014, 2015 and 2016, BJ Fastweb enjoyed a preferential tax rate of 15%.

In December 2013, WiFire BJ, a subsidiary located in Beijing, qualified as an HNTE and became eligible for a 15% preferential tax rate effective from 2013 to 2015, and thereafter for an additional three years if it is able to meet the HNTE technical and administrative requirements in those three years. Wifire BJ has successfully reviewed the HNTE certificate in 2016. For the years ended December 31, 2014, 2015 and 2016, WiFire BJ enjoyed 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 years ended December 31, 2013 and 2014, BJ iJoy enjoyed the 100% tax exemption for its taxable income. For the year ended December 31, 2015 and 2016, BJ iJoy enjoyed the half-reduced EIT rate for its taxable income.

In 2010, GD Tianying, a subsidiary located in Guangdong Province, qualified as an HNTE and is eligible for a 15% preferential tax rate effective from 2010 to 2012, and thereafter for an additional three years if it is able to meet the HNTE technical and administrative requirements in those three years. The Company’s HNTE certificate expired as of December 31, 2012 and the Company obtained a renewed certificate in October 2013, which has expired on October 12, 2016. For the years ended December 31, 2014 and 2015, GD Tianying enjoyed a preferential tax rate of 15%. For the year ended December 31, 2016, GD Tianying was subject to the statutory tax rate of 25%.

In October 2015, SH Blue Cloud, a subsidiary located in Shanghai, qualified as an HNTE and became eligible for a 15% preferential tax rate effective from 2015 to 2017, and thereafter for an additional three years if it is able to meet the HNTE technical and administrative requirements in those three years. For the years ended December 31, 2015 and 2016, SH Blue Cloud enjoyed a preferential tax rate of 15%.

In November 2016, SZ DYX, a subsidiary located in Guangdong Province, qualified as an HNTE and became eligible for a 15% preferential tax rate effective from 2016 to 2018, and thereafter for an additional three years if it is able to meet the HNTE technical and administrative requirements in those three years. For the year ended December 31, 2016, SZ DYX enjoyed a preferential tax rate of 15%.

In 2010 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 years ended December 31, 2014, 2015 and 2016, SC Aipu and YN Aipu enjoyed 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, 2014, 2015 and 2016.

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, 2016, no detailed interpretation or guidance has been issued to define “place of effective management”. Furthermore, as of December 31, 2016, 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.

Loss before income taxes consists of:


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Non-PRC		(485,539	)		(256,279	)		(155,364	)		(22,377	)
PRC		173,735			(97,166	)		(787,718	)		(113,454	)

		(311,804	)		(353,445	)		(943,082	)		(135,831	)

Income tax (expense) benefits comprises of:


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Current		(45,401	)		(68,092	)		(54,772	)		(7,889	)
Deferred		28,728			20,262			65,932			9,496

		(16,673	)		(47,830	)		11,160			1,607

The reconciliation of tax computed by applying the statutory income tax rate of 25% for the years ended December 31, 2014, 2015 and 2016 applicable to the PRC operations to income tax (expense) benefits is as follows:


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Loss before income taxes		(311,804	)		(353,445	)		(943,082	)		(135,831	)

Income tax benefit computed at applicable tax rates (25%)		77,951			88,361			235,770			33,958
Non-deductible expenses		(6,095	)		(19,216	)		(16,610	)		(2,392	)
Research and development expenses		6,879			6,871			7,766			1,119
Effect of tax holidays		6,305			2,743			1,691			244
Preferential rate		20,049			6,183			(11,060	)		(1,593	)
Current and deferred tax rate differences		(8,553	)		(2,876	)		(1,521	)		(219	)
International rate differences		(108,066	)		(90,773	)		(51,392	)		(7,402	)
Tax exempted income		2,118			—			9,878			1,423
Unrecognized tax benefits		3,872			(529	)		(14,525	)		(2,092	)
Deferred tax expense		(3,109	)		(387	)		1,516			218
Change in valuation allowance		(7,704	)		(36,529	)		(158,724	)		(22,861	)
Prior year provision to return true up		(320	)		(1,678	)		8,371			1,204

Income tax (expense) benefits		(16,673	)		(47,830	)		11,160			1,607

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


	For the year ended December 31,
	2014		2015		2016
	RMB		RMB		RMB		US$
Basic		0.016		0.006		0.003		0.000

Diluted		0.016		0.006		0.003		0.000

Deferred Tax

The significant components of deferred taxes are as follows:


	December 31,
	2015			2016
	RMB			RMB			US$
Deferred tax assets
Current
Allowance for doubtful debt		7,533			25,224			3,633
Accrued salary and welfare		22,843			30,236			4,355
Accrued expenses		4,474			3,955			570
Property and equipment		1,487			1,612			232
Deferred government grant-current		321			201			29
Valuation allowance		(5,545	)		(17,866	)		(2,574	)

Net current deferred tax assets		31,113			43,362			6,245

Non-current
Tax losses		46,283			202,485			29,164
Property and equipment		18,783			13,486			1,942
Intangible assets		1,772			1,254			181
Capital lease		15,061			23,364			3,365
Deferred government grant-non-current		5,259			4,700			677
Depreciation and amortization generated from acquisitions		7,163			5,849			842
Valuation allowance		(47,421	)		(193,824	)		(27,916	)

Net non-current deferred tax assets		46,900			57,314			8,255

Total deferred tax assets		78,013			100,676			14,500

Non-current
Intangible assets		204,236			148,003			21,317
Property and equipment		69,038			92,687			13,350
Capitalized interest expense		6,700			11,789			1,698
Gain generated from equity method investments		13,238			22,221			3,200

Total non-current deferred tax liabilities		293,212			274,700			39,565

As of December 31, 2016, the Company has net tax operating losses from its PRC subsidiaries and its Consolidated VIEs, as per filed tax returns, of RMB778,587 (US$112,140), which will expire between 2017 to 2021.

As of December 31, 2016, the Company intends to permanently reinvest the undistributed earnings from other foreign subsidiaries to fund future operations. As of December 31, 2016, the total amount of undistributed earnings from its PRC subsidiaries as well as VIEs was RMB1,025,340 (US$147,680). 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, 2015 and 2016, the Company recorded unrecognized tax benefits of RMB14,492 and RMB28,689 (US$4,132), 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. RMB21,610 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,
	2015			2016
	RMB			RMB			US$
Balance at beginning of year		16,682			11,802			1,700
Reversal based on tax positions related to prior years		(11,144	)		(258	)		(37	)
Additions based on tax positions related to the current year		6,264			11,676			1,682

Balance at end of year		11,802			23,220			3,345

In the years ended December 31, 2014, 2015 and 2016, the Company (reversed) recorded interest expense of RMB(556), RMB(1,082) and RMB2,779 (US$400), respectively. Accumulated interest expense recorded by the Company was RMB2,690 and RMB5,469 (US$787) as of December 31, 2015 and 2016, respectively. As of December 31, 2016, the tax years ended December 31, 2012 through 2016 for the PRC subsidiaries remain open for statutory examination by the PRC tax authorities.

Related Party Transactions

12 Months Ended

Dec. 31, 2016

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⁾
BitCool Media Group Limited (“Bitcool Media”)		A company controlled by aBitCool
Shanghai Shibei Hi-Tech Co., Ltd. (“SH Shibei”)		Noncontrolling shareholder of a subsidiary
A PRC citizen		Seller of iJoy
Suzhou Youpusi Information Technology Co., Ltd. (formerly known as Suzhou Aizhuoyi Information Technology Co., Ltd.) (“SZ Youpusi”)		A company controlled by the seller of iJoy
Mr. Li		Noncontrolling shareholder of Aipu Group
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
Beijing Cheetah Mobile Technology Co., Ltd. (“BJ Cheetah”) ⁽²⁾		A company controlled by principal shareholder of the Company
Chengdu Xishanju Shiyou Technology Co., Ltd. (“CD Xishanju”) ⁽²⁾		A company controlled by principal shareholder of the Company
Beijing Kingsoft Cloud Network Technology Co., Ltd. (“BJ Kingsoft”) ⁽²⁾		A company controlled by principal shareholder of the Company
Chengdu Kingsoft Digital Entertainment Technology Co., Ltd. (“CD Kingsoft”) ⁽²⁾		A company controlled by principal shareholder of the Company
Xiaomi Communication Technology Co., Ltd. (“Xiaomi Communication”) ⁽³⁾		A company controlled by principal shareholder of the Company
Taiwan Xiaomi Communication Technology Co., Ltd. (“TW Xiaomi”) ⁽³⁾		A company controlled by principal shareholder of the Company
Xiaomi Technology Co., Ltd. (“Xiaomi Technology”) ⁽³⁾		A company controlled by principal shareholder of the Company
Beijing Xiaomi Mobile Software Co., Ltd. (“BJ Xiaomi”)⁽³⁾		A company controlled by principal shareholder of the Company
Chengdu Xingpu Investment Management Co., Ltd. (“CD Xingpu”)		A related party of Mr. Li
Anlai Network Communication Technology Company Limited (“Anlai”)		Seller of Dermot Entities
WNT Technology Limited (“WNT Technology”)		A related party of Lap Man
Chengdu Guotao Communication Co., Ltd (“CD Guotao”)		Noncontrolling shareholder of Aipu
Dyxnet Data Centre Services Limited(“DCSS”)		Lap Man as Common director, a related party of seller of Dermot entities

*	These are the related parties that have engaged in significant transactions with the Company for the year ended December 31, 2014, 2015 and 2016.

(1)

There are certain shareholders (“Common Shareholders”) that are shareholders of both aBitCool and the Company. As of December 31, 2016, in terms of economic interests and voting power, the Common Shareholders’ ownership interests in the Company were 5.89% and 15.42% while 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)	These companies and Kingsoft are ultimately controlled by the same party. Kingsoft made a significant investment in the Company in 2015 and 2016 (note 28).

(3)	These companies and Xiaomi are ultimately controlled by the same party. Xiaomi made a significant investment in the Company in 2015 and 2016 (note 28).

Other than disclosed elsewhere, the Company had the following significant related party transactions for the years ended December 31, 2014, 2015 and 2016:


	For the years ended December 31,
	2014		2015		2016
	RMB		RMB		RMB		US$
Services provided to:
- Xiaomi Communication		—		27,144		113,458		16,341
- BJ Kingsoft		—		7,969		19,471		2,804
- BJ Xiaomi		—		275		11,689		1,684
- BJ Cheetah		—		6,712		9,478		1,365
- CD Xishanju		—		3,379		2,320		334
- TW Xiaomi		—		91		93		13
- Upwise		143		204		—		—
- DCS		18		73		—		—
- DIC		—		508		—		—

Services provided by:
- DCSS		—		—		10,883		1,567
- DIC		4,106		10,764		7,053		1,016
- WNT Technology		—		—		2,125		306
- BJ Kingsoft		—		—		1,045		151
- DCS		587		9,259		—		—
- Upwise		97		253		—		—

Purchases of equipment and property from:
- DIC		—		—		3,079		443
- SZ Youpusi		80,059		3,577		1,410		203
- DCS		330		—		—		—
- CD Xingpu		—		37,101		—		—

Loans provided to:
- Seller of Aipu Group		98,500		—		—		—
- BitCool Media		22,792		—		—		—

Loan from:
- CD Guotao		—		—		3,483		502

Repayment of loans:
- BitCool Media		35,380		—		—		—

Receipt of interest income from loan to:
- BitCool Media		1,553		—		—		—

Interest income from loan to:
- BitCool Media		956		1,211		—		—

Management service provided by:
- DCS		8,949		16,602		—		—

The Company had the following related party balances as of December 31, 2015 and 2016:


	December 31,
	2015		2016
	RMB		RMB		US$
Amounts due from related parties:
Current:
- Seller of Aipu Group		28,500		98,500		14,187
- Seller of iJoy		25,974		27,748		3,997
- Xiaomi Communication		9,367		22,473		3,237
- CD Xingpu		—		12,466		1,795
- SH Shibei		9,800		9,800		1,411
- BJ Cheetah		2,590		4,776		688
- BJ Kingsoft		3,561		3,864		557
- BJ Xiaomi		—		1,631		235
- SZ Youpusi		863		817		118
- CD Xishanju		1,469		256		37
- TW Xiaomi		20		—		—
- Bitcool Media		22,605		—		—
- Upwise		327		—		—
- DCS		61		—		—
- Others		—		284		40

		105,137		182,615		26,302

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

Amounts due to related parties:
Current:
- Seller of the Managed Network Entities		47,755		47,755		6,878
- Seller of iJoy		61,436		38,131		5,492
- Seller of Aipu Group		76,666		30,000		4,321
- CD Guotao		—		3,483		502
- BJ Kingsoft		—		1,105		159
- SZ Youpusi		—		667		96
- DCS		894		—		—
- Xiaomi Technology		210		361		52
- CD Xingpu		1,000		43		6
- DIC		789		11		2
- Seller of WiFire BJ and Yilong		2,970		—		—
- Sellers of Dermot Entities		205,800		—		—
- Upwise		41		—		—
- CD Kingsoft		5		—		—
- BJ Cheetah		22		—		—
- Others		—		372		53

		397,588		121,928		17,561


	December 31,
	2015		2016
	RMB		RMB		US$
Non-current:
- Seller of Tianying		16,350		—		—
- Seller of Aipu Group		11,034		—		—

		27,384		—		—

Segment Reporting

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Segment Reporting

25.

SEGMENT REPORTING

The operations of the Company are organized into two segments, consisting of the Hosting and related services and Managed network services. The Company derives the results of the segments directly from its internal management reporting system. The CODM measures the performance of each segment based on metrics of revenue and earnings from operations and uses these results to evaluate the performance of, and to allocate resources to, each of the segments. Because substantially all of the Group’s long-lived assets and revenues are located in and derived from the PRC, geographical segments are not presented.

The table below provides a summary of the Group’s operating segment results for the years ended December 31, 2014, 2015 and 2016.


	For the years ended December 31,
	2014			2015			2016			2016
	RMB			RMB			RMB			US$
	(In thousands)
Hosting and related services
Revenues		1,505,233			2,369,223			2,668,655			384,366
Operating profit (loss)		9,882			(64,658	)		44,101			6,352
Managed network services
Revenues		1,371,214			1,265,149			973,119			140,159
Operating loss		(124,582	)		(219,575	)		(884,297	)		(127,365	)


Group consolidated revenue		2,876,447			3,634,372			3,641,774			524,525
Group consolidated operating loss		(114,700	)		(284,233	)		(840,196	)		(121,013	)

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Restricted Net Assets

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Restricted Net Assets

26.

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 a foreign-invested enterprise and, therefore, is subject to the above mandated restrictions on distributable profits. As of December 31, 2015 and 2016, the Company’s PRC subsidiaries had appropriated RMB63,174 and RMB64,622 (US$9,308), 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 PRC subsidiaries and the equity of the Consolidated VIEs, as determined pursuant to PRC generally accepted accounting principles, totaling an aggregate of RMB4,217,827 (US$607,493) as of December 31, 2016.

Loss Per Share

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Loss Per Share

27.

LOSS PER SHARE

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


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
*Numerator:*
Net loss		(328,477	)		(401,275	)		(931,922	)		(134,224	)
Net (profit) loss attributable to noncontrolling interest and redeemable noncontrolling interest		(20,003	)		(26,824	)		298,324			42,968

Net loss attributable to ordinary shareholders		(348,480	)		(428,099	)		(633,598	)		(91,256	)
Plus: (Increase) decrease in accretion of redeemable noncontrolling interests		(7,850	)		7,850			(210,485	)		(30,316	)

Adjusted net loss attributable to ordinary shareholders		(356,330	)		(420,249	)		(844,083	)		(121,572	)

*Denominator:*
Weighted-average number of shares outstanding—basic		401,335,788			492,065,239			617,169,833			617,169,833
Weighted-average number of shares outstanding—diluted		401,335,788			492,065,239			617,169,833			617,169,833
Loss per share—Basic:
Net loss		(0.89	)		(0.85	)		(1.37	)		(0.20	)

		(0.89	)		(0.85	)		(1.37	)		(0.20	)

Loss per share—Diluted:
Net loss		(0.89	)		(0.85	)		(1.37	)		(0.20	)

		(0.89	)		(0.85	)		(1.37	)		(0.20	)

In 2013, 2015 and 2016, the Company issued 6,000,000, 7,200,000 and 4,500,000 ordinary shares to its share depositary bank which will be used to settle stock option awards upon their exercise, respectively. 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 loss 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 loss 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, 2016

Share Capital

28.

SHARE CAPITAL

In May 2014, the Company’s annual general meeting of shareholders authorized 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 2014, the Company issued 2,666,898 Class A ordinary shares to the sellers of Fastweb and WiFire BJ and Yilong in settlement of the contingent purchase considerations. In addition, the Company also issued 3,683,712 Class A ordinary shares to Galaxy ENet Inc. (Note 22(b)).

In 2015, the Company issued 39,087,125 Class A and 18,250,268 Class B ordinary shares to Kingsoft for an aggregate cash consideration of US$172,012 and the Company issued 6,142,410 Class A and 10,524,257 Class B ordinary shares to Xiaomi for an aggregate cash consideration of US$50,000. In addition, the Company issued 24,668,022 Class A ordinary shares to Esta for an aggregate cash consideration of US$74,004. The Company also issued 13,098,599 Class A ordinary shares to the sellers of Dermot Entities, GD Tianying and iJoy in settlement of the contingent purchase considerations.

In May 2016, the Company issued 31,996,874 Class A ordinary shares and 111,053,390 Class B ordinary shares at the subscription price of approximately US$2.712 per ordinary share, or US$16.274 per ADS to Tuspark Innovation Venture Limited.

In May 2016, the Company also issued 10,087,476 Class A ordinary shares to the sellers of certain acquired Entities in settlement of the contingent purchase considerations.

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.

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Redeemable Noncontrolling Interests

Redeemable Noncontrolling Interests

12 Months Ended

Dec. 31, 2016

Noncontrolling Interest [Abstract]

29.

REDEEMABLE NONCONTROLLING INTERESTS


	For the year ended December 31,
	2014		2015			2016
	RMB		RMB			RMB			US$
Balance as of January 1		—		773,706			790,229			113,817
Acquisition of Aipu Group (Note 4)		748,040		—			—			—
Current profit (loss)		17,816		24,373			(300,714	)		(43,312	)
Increase (decrease) in accretion of redeemable noncontrolling interests		7,850		(7,850	)		210,485			30,316

Balance as of December 31		773,706		790,229			700,000			100,821

Fair Value Measurements

12 Months Ended

Dec. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

30.

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 and bonds payable are classified within Level 1 because they are valued by using quoted market prices.

Floating rate principal unguaranteed investments and fixed rate principal guaranteed investments are classified within Level 2 because the underlying assets values within these investments are directly observable in the marketplace.

The mandatorily redeemable noncontrolling interests (Note 1(c)), the contingent considerations for the acquired businesses (Note 4), the share-settled bonuses, liability classified RSU and long term investments 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.

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, 2015
	RMB		RMB		RMB		RMB
Cash equivalents:
- Fixed rate time deposits		771,723		—		—		771,723

Held-to-maturity short-term investments:
- Floating rate principal unguaranteed investments		—		102,300		—		102,300

Long-term investments:
- Available-for-sale investments		—		—		2,597		2,597

Assets		771,723		102,300		2,597		876,620

Long-term borrowings:
- Bonds payable		2,193,744		—		—		2,193,744

Other liabilities:
- Share-settled bonuses		—		—		41,352		41,352
- Mandatorily redeemable noncontrolling interests in Asia Cloud Investment		—		—		100,000		100,000

Amounts due to related parties:
- Contingent consideration payables in relation to the acquisition of subsidiaries		—		—		372,256		372,256

Liabilities		2,193,744		—		513,608		2,707,352


	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, 2016
	RMB		RMB		RMB		RMB		US$
Cash equivalents:
- Fixed rate time deposits		588,589		—		—		588,589		84,774

Held-to-maturity short-term investments:
- Fixed rate time deposits		277,946		—		—		277,946		40,033

Long-term investments
- Available-for-sale investments		—		—		7,921		7,921		1,141

Assets		866,535		—		7,921		874,456		125,948

Long-term borrowings:
- Bonds payable		418,497		—		—		418,497		60,276

Other liabilities:
- Share-settled bonuses		—		—		37,526		37,526		5,405
- Liability classified RSU						34,612		34,612		4,985

Amounts due to related parties:
- Contingent consideration payable in relation to the acquisition of subsidiaries		—		—		65,797		65,797		9,477

Liabilities		418,497		—		137,935		556,432		80,143

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 payables
	RMB
Fair value at January 1, 2015		548,017
Changes in the fair value		43,325
Payment of cash consideration		(4,543	)
Reclassification to equity upon resolution of contingencies		(214,543	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2015		372,256

Changes in the fair value		(93,307	)
Payment of cash consideration		(2,617	)
Reclassification to equity upon resolution of contingencies		(210,535	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2016		65,797

Fair value at December 31, 2016 (US$)		9,477


	Share-settled bonuses
	RMB
Fair value at January 1, 2015		14,913
Increase in bonuses settled in shares during 2015		41,146
Changes in the fair value		5,683
Reclassification to equity		(19,072	)
Reclassification to “Accrued expenses and other payables-Others”		(1,318	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2015		41,352

Increase in bonuses settled in shares during 2016		37,678
Changes in the fair value		(5,319	)
Reclassification to equity		(15,890	)
Reclassification to “Accrued expenses and other payables-Others”		—
Bonuses settled in cash during 2016		(20,295	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2016		37,526

Fair value at December 31, 2016 (US$)		5,405


	Liability classified RSU
	RMB
Fair value at January 1, 2016		—
Increase in liability classified RSU		36,834
Reclassification to equity		(2,222	)
Transfers in and/or out of Level 3		—
Fair value at December 31, 2016		34,612

Fair value at December 31, 2016 (US$)		4,985


	Mandatorily redeemable noncontrolling interests in Asia Cloud Investment
	RMB
Fair value at January 1, 2016		100,000
Changes in the fair value		—
Transfers in and/or out of Level 3 (Note 1(c))		(100,000	)

Fair value at December 31, 2016		—

Fair value at December 31, 2016 (US$)		—

Changes in the fair value of the contingent purchase consideration payables 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, 2016

Commitments and Contingencies

31.

COMMITMENTS AND CONTINGENCIES

Capital commitments

As of December 31, 2016, the Company has the following commitments to purchase certain computer and network equipment and construction in progress:


	RMB		US$
2017		140,834		20,284
2018		33,531		4,829
2019		13,916		2,004

		188,281		27,117

Operating lease commitments

The Company leases facilities in the PRC, Hong Kong and United States under non-cancelable operating leases expiring on different dates. For the years ended December 31, 2014, 2015 and 2016, total rental expenses for all operating leases amounted to RMB56,247, RMB92,520 and RMB93,869 (US$13,520), respectively. As of December 31, 2016, 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$
2017		124,557		17,940
2018		77,354		11,141
2019		49,505		7,130
2020		35,985		5,183
2021 and thereafter		157,641		22,705

		445,042		64,099

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, 2016, the Company had outstanding purchase commitments in relation to bandwidth and cabinet capacity consisting of the following:


	RMB		US$
2017		1,141,347		164,388
2018		48,959		7,052
2019		37,352		5,380
2020		35,317		5,087
2021 and thereafter		96,891		13,955

		1,359,866		195,862

Managed Network Services

As of December 31, 2016, 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, 2016 and the Company’s estimate of the contingent payable remains unchanged.

Income Taxes

As of December 31, 2016, the Group has recognized an accrual of RMB28,689 (US$4,132) 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, 2016, 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 alleged that certain of the Company’s financial statements and other public disclosures contained misstatements or omissions and asset 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, 2016

Subsequent Events [Abstract]

Subsequent Events

32.

SUBSEQUENT EVENTS

In March 2017, the Company entered into an investment agreement with Warburg Pincus to establish a multi-stage joint venture and build a digital real estate platform in China. The Company will seed the initial JV with four existing high-performing IDC assets, valued at over US$300 million, and Warburg Pincus will contribute direct capital and extensive industry network and resources in the real estate sector. The Company will continue to own 51% of the equity interests in the four existing IDC assets while Warburg Pincus will own the remaining 49%. With respect to further projects to be developed by the joint venture, the Company will initially own 49% of the equity interests and Warburg Pincus will initially own 51% of the equity interests.

Parent Company Only Condensed Financial Information

12 Months Ended

Dec. 31, 2016

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Parent Company Only Condensed Financial Information

33.

PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION

Condensed balance sheets


	Note			As of December 31,
				2015			2016
				RMB			RMB			US$
ASSETS
Current assets
Cash					798,200			596,871			85,967
Restricted cash					—			1,759,726			253,453
Short-term investments					—			277,946			40,033
Prepaid expenses and other current assets					66,287			103,271			14,874
Amount due from a related party		(b	)		25,974			97,748			14,079
Amount due from subsidiaries		(b	)		3,153,413			3,208,620			462,137

Total current assets					4,043,874			6,044,182			870,543

Non-current assets
Investments in subsidiaries					2,565,783			2,133,242			307,251
Amount due from a related party		(b	)		70,000			—			—
Other non-current assets					6,123			—			—

Total non-current assets					2,641,906			2,133,242			307,251

Total assets					6,685,780			8,177,424			1,177,794

LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accrued expenses and other payables					14,826			38,599			5,560
Short-term bank borrowings					—			1,500,000			216,045
Account payables					5,929			10,672			1,537
Interest payable					7,829			5,759			829
Amount due to related parties		(b	)		346,872			68,131			9,813
Amount due to subsidiaries		(b	)		3,728			9,732			1,402
Bonds payable		(d	)		264,250			419,316			60,394

Total current liabilities					643,434			2,052,209			295,580

Non-current liabilities
Amount due to related parties		(b	)		27,384			—			—
Bonds payable		(d	)		2,000,000			—			—

Total non-current liabilities					2,027,384			—			—

Total liabilities					2,670,818			2,052,209			295,580

Shareholders’ equity:
Class A Ordinary shares (par value of US$0.00001 per share; 1,200,000,000 and 1,200,000,000 shares authorized; 458,916,346 and 505,207,968 shares issued and outstanding as of December 31, 2015 and 2016, respectively)					30			33			4
Class B Ordinary shares (par value of US$0.00001 per share; 300,000,000 and 300,000,000 shares authorized; 63,596,248 and 174,649,638 shares issued and outstanding as of December 31, 2015 and 2016, respectively)					4			12			2
Additional paid-in capital					6,403,117			9,015,846			1,298,551
Accumulated other comprehensive (loss) income					(24,236	)		118,290			17,037
Accumulated deficit					(2,170,811	)		(2,804,409	)		(403,918	)
Treasury stock					(193,142	)		(204,557	)		(29,462	)

Total shareholders’ equity					4,014,962			6,125,215			882,214

Total liabilities and shareholders’ equity					6,685,780			8,177,424			1,177,794

Condensed statements of operations


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Operating Expenses
General and administrative expenses		(125,859	)		(166,662	)		(124,450	)		(17,923	)
Changes in the fair value of contingent purchase consideration payables		(22,629	)		(43,325	)		93,307			13,439

Operating loss		(148,488	)		(209,987	)		(31,143	)		(4,484	)
Other income		(199,418	)		(152,100	)		(169,915	)		(24,473	)
Share of losses from subsidiaries and Consolidated VIEs		(574	)		(66,012	)		(432,540	)		(62,299	)

Loss before income taxes		(348,480	)		(428,099	)		(633,598	)		(91,256	)
Income tax expense		—			—			—			—

Net loss		(348,480	)		(428,099	)		(633,598	)		(91,256	)

Condensed statements of comprehensive loss


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Net loss		(348,480	)		(428,099	)		(633,598	)		(91,256	)
Other comprehensive loss, net of tax of nil:
Foreign currency translation adjustments, net of tax of nil		16,835			41,518			142,526			20,528

Other comprehensive loss, net of tax of nil:		16,835			41,518			142,526			20,528

Comprehensive loss		(331,645	)		(386,581	)		(491,072	)		(70,728	)

Comprehensive loss attributable to the Company’s ordinary shareholders		(331,645	)		(386,581	)		(491,072	)		(70,728	)

Condensed statements of cash flows


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Net cash used in operating activities		(23,952	)		(26,621	)		(78,567	)		(11,316	)
Net cash used in investing activities		(1,186,053	)		(977,300	)		(617,613	)		(88,955	)
Net cash generated from financing activities		623,214			1,798,230			494,851			71,273

Net (decrease) increase in cash		(586,791	)		794,309			(201,329	)		(28,998	)
Cash at beginning of the year		590,682			3,891			798,200			114,965

Cash at end of the year		3,891			798,200			596,871			85,967

(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, 2015 and 2016:


	December 31,
	2015		2016
	RMB		RMB		US$
Amount due from subsidiaries
- 21Vianet HK		2,997,103		3,037,249		437,455
- Xi’an Holding		6,563		7,011		1,010
- Ventures		19,546		27,124		3,907
- Asia Cloud Technology		4,157		—		—
- WiFire Group		649		4,301		619
- Fastweb Technology		54,364		60,574		8,724
- 21V Mobile		71,031		72,361		10,422

		3,153,413		3,208,620		462,137

Amount due from related parties
Current:
- Seller of iJoy		25,974		27,748		3,997
- Seller of Aipu Group		—		70,000		10,082

		25,974		97,748		14,079

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

Amount due to subsidiaries
- 21Vianet Technology		7		7		1
- 21Vianet Beijing		3,719		9,713		1,400
- 21Vianet China		2		2		—
- DYX		—		10		1

		3,728		9,732		1,402


	December 31,
	2015		2016
	RMB		RMB		US$
Amount due to related parties
Current:
- Sellers of WiFire BJ &Yilong		2,970		—		—
- Seller of Aipu Group		76,666		30,000		4,321
- Seller of Dermot Entities		205,800		—		—
- Seller of iJoy		61,436		38,131		5,492

		346,872		68,131		9,813

Non-current:
- Sellers of Tianying		16,350		—		—
- Seller of Aipu Group		11,034		—		—

		27,384		—		—

(c)

Commitments

Operating lease commitments

The Company leases a facility in the United States under non-cancelable operating lease expiring on March 1, 2025. For the year ended December 31, 2014, 2015 and 2016, total rental expense for the operating lease amounted to nil, RMB13,952 and RMB15,824 (US$2,279).

As of December 31, 2016, the Company has future minimum lease payments under non-cancelable operating leases with initial terms in excess of one year in relation to data center space consisting of the following:


	RMB		US$
2017		18,532		2,669
2018		18,996		2,736
2019		19,471		2,804
2020		19,957		2,874
2021 and thereafter		90,486		13,033

		167,442		24,116

(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 were due and fully repaid in March 2016.

On June 26, 2014, the Company issued and sold 2017 Bonds with an aggregate principal amount of RMB2,000,000 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, were RMB1,980,640. 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 trade payables) of the Company’s subsidiaries and Consolidated VIEs.

In August 2016, the Company repurchase 78.97% of the outstanding 2017 Bonds with the total principal amount of RMB1,579,400 (US$227,481). Payment of accrued interests was RMB18,742 (US$2,702). The debt extinguishment loss amounting to RMB29,841 (US$4,298) was recognized in earnings upon the repurchase.

The entire disclosure for condensed financial information, including the financial position, cash flows, and the results of operations of the registrant (parent company) as of the same dates or for the same periods for which audited consolidated financial statements are being presented. Alternatively, the details of this disclosure can be reported by the specific parent company taxonomy elements, indicating the appropriate date and period contexts in an instance document.

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2016

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

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.

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

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, floating rate principal guaranteed investments and floating rate principal unguaranteed 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.

No impairment loss had been recorded during each of the three years ended December 31, 2014, 2015 and 2016.

Accounts Receivable and Allowance for Doubtful Debt

(i)

Accounts receivable and allowance for doubtful debt

(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			3.4 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
Internally use software			7 years
Property management relationship*			9 years

Acquired in the acquisitions of subsidiaries.

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.

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 investments 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, 2015 and 2016.

Impairment of long-lived assets

(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, 2015 and 2016 were mainly related to its acquisitions of the Managed Network Entities, Fastweb, iJoy, Aipu Group and Dermot Entities. 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.

(p)

Impairment of long-lived assets

The impairment loss reduced the carrying amount of the long-lived assets of a group on a pro-rata basis using the relative carrying amount of those assets.

The Company recorded impairment charges associated with its long-lived assets and acquired intangibles as follows:


	Years ended December 31,
	2014		2015		2016
	RMB		RMB		RMB		US$
Impairment of property and equipment		—		—		238,144		34,300
Impairment of intangible assets		—		—		154,803		22,296

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, 2014, 2015 and 2016, was as follows:


	2014			2015			2016
	RMB			RMB			RMB			US$
Interest expense and amortization cost of bonds		130,355			172,677			113,367			16,328
Interest expense on bank and other borrowings		66,699			55,391			46,377			6,680
Interest expense on capital lease		40,849			57,189			66,687			9,605

Total interest costs		237,903			285,257			226,431			32,613
Less: Total interest costs capitalized		(5,883	)		(11,073	)		(27,842	)		(4,010	)

Interest expense, net		232,020			274,184			198,589			28,603

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

Loss per share

(aa)

Loss per share

Share repurchase program

(bb)

Share repurchase program

Comprehensive loss

(cc)

Comprehensive loss

Segment reporting

(dd)

Segment reporting

The Company has restated the presentation of its reportable segments for prior years to conform with the current year’s presentation.

Employee benefits

(ee)

Employee benefits

Comparatives

(ff)

Comparatives

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, 2016

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, 2016, 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”) ⁽⁵⁾	September 9, 2012	Cayman Islands		100	%	Investment holding
Hong Kong Fastweb Holdings Co., Limited (“Fastweb HK”) ⁽⁵⁾	September 9, 2012	Hong Kong		100	%	Investment holding
Beijing Fastweb Technology Co., Ltd. (“Fastweb Technology”) ^{(1) /}⁽⁵⁾	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 Xi’an Holding Limited (“21V Xi’an Holding”) ⁽⁴⁾	July 5, 2012	British Virgin Islands		100	%	Investment holding
21Vianet (Xi’an) Technology Co., Ltd. (“Xi’an Tech”) ^{(1) /(4)}	July 5, 2012	PRC		100	%	Provision of technical and internet data center
21Vianet Hangzhou Information Technology Co., Ltd. (“HZ Technology”) ⁽¹⁾	March 4, 2013	PRC		100	%	Provision of internet data center services
21Vianet Mobile Limited (“21V Mobile”) ⁽⁷⁾	April 30, 2013	Hong Kong		100	%	Investment holding
Joytone Infotech Co., Ltd. (“SZ Zhuoaiyi”) ^{(1) / (7)}	April 30, 2013	PRC		100	%	Provision of technical and consultation services
21Vianet Ventures Limited (“Ventures”)	March 6, 2014	Hong Kong		100	%	Investment holding
WiFire Group Inc. (“WiFire Group”)	March 7, 2014	British Virgin Islands		100	%	Investment holding
Abitcool (China) Broadband Inc. (“aBitCool DG”) ⁽¹⁾	June 13, 2014	PRC		100	%	Dormant company
Diyixian.com Limited (“DYX”)⁽⁹⁾	August 10, 2014	Hong Kong		100	%	Provision of virtual private network services
Dermot Holding Limited (“Dermot BVI”) ⁽⁹⁾	August 8, 2014	British Virgin Islands		100	%	Investment holding
21Vianet Zhuhai Financial Leasing Co., Ltd. (“Zhuhai Financial Leasing”) ⁽¹⁾	April 9, 2015	PRC		100	%	Provision of financial leasing business services
Foshan Zhuoyi Intelligence Date Co., Ltd. (“FS Zhuoyi”)”) ^(1) /(11)	July 7, 2016	PRC		100	%	Dormant company

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)/ (7)}	April 30, 2013	PRC		—		Provision of internet data center, content delivery network services
WiFire Network Technology (Beijing) Co., Ltd. (formerly known as aBitCool Small Micro Network Technology (BJ) Co., Ltd.) (“WiFire Network”) ^{(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)/ (7)}	May 30, 2013	PRC		—		Provision of internet data center, 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
Held directly by 21Vianet Beijing:
21Vianet (Xi’an) Information Outsourcing Industry Park Services Co., Ltd. (“Xi’an Sub”) ^{(1) / (2)}	June 23, 2008	PRC		—		Provision of internet data center services
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) / (5)}	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
WiFire (Beijing) Technology Co., Ltd. (formerly known as Beijing Tianwang Online Communication Technology Co., Ltd.) (“WiFire BJ”) ^{(1) / (2) / (6)}	February 28, 2013	PRC		—		Provision of managed network services and virtual private network services
Beijing Yilong Xinda Technology Co., Ltd. (“BJ Yilong”) ^{(1) / (2) / (6)}	February 28, 2013	PRC		—		Provision of managed network services and virtual private network services
Beijing Yichengtaihe Investment Co., Ltd. (“BJ Yichengtaihe”) ^{(1)/ (2)/ (10)}	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 (“DYX net”)⁽⁹⁾	August 10, 2014	Hong Kong		100	%	Dormant Company

Held directly by DYX and LF Xunchi:
Shenzhen Diyixian Telecommunication 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, 2010, the Company through its subsidiary, 21Vianet Beijing acquired CYSD, ZBXT and its subsidiaries (collectively, the “Managed Network Entities”).

(4)	On July 5, 2012, the Company through its wholly-owned subsidiary, 21Vianet HK, acquired 100% equity interests in 21V Xi’an Holding and its subsidiaries (collectively referred to as “21V Xi’an”).

(5)	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”).

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

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

(8)	On May 31, 2014, the Company and its subsidiary, Langfang Xunchi Computer Data Processing Co., Ltd. (“LF Xunchi”), acquired 50% equity interest 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 September 30, 2014, the Company through its subsidiary, 21Vianet Beijing acquired 100% equity interest in the entity, which was accounted for an assets acquisition (Note 4).

(11)	On July 7, 2016, the Company through its subsidiary, 21Vianet HK acquired 100% equity interest in the entity, which was accounted for an assets acquisition (Note 4).

Consolidated VIE before Eliminating Intercompany Balances


	As of December 31,
	2015		2016
	RMB		RMB		US$
ASSETS
Current assets:
Cash and cash equivalents		391,182		239,874		34,549
Restricted cash		135,875		68,709		9,896
Accounts receivable (net of allowance for doubtful debt of RMB39,010 and RMB80,313 (US$11,567) as of December 31, 2015 and 2016, respectively)		630,582		555,509		80,010
Inventories		13,115		4,320		622
Short-term investments		102,300		—		—
Prepaid expenses and other current assets		548,061		636,776		91,715
Deferred tax assets		29,029		40,751		5,869
Amounts due from related parties		55,503		82,350		11,861

Total current assets		1,905,647		1,628,289		234,522

Non-current assets:
Property and equipment, net		2,226,653		2,501,578		360,302
Intangible assets, net		810,171		555,649		80,030
Land use rights, net		64,682		76,044		10,953
Goodwill		1,146,570		1,146,570		165,140
Deferred tax assets		44,688		56,312		8,111
Other non-current assets		153,772		112,822		16,250
Long-term investments		164,454		266,748		38,420

Total non-current assets		4,610,990		4,715,723		679,206

Total assets		6,516,637		6,344,012		913,728

Current liabilities:
Short-term bank borrowings		276,000		183,676		26,455
Accounts and notes payable		416,850		441,847		63,639
Accrued expenses and other payables		435,912		525,613		75,704
Advance from customers		185,800		201,397		29,007
Income tax payable		43,949		25,466		3,668
Deferred revenue		332,091		311,191		44,821
Amount due to inter-companies ⁽¹⁾		890,988		1,221,897		175,990
Amount due to related parties ⁽²⁾		48,762		53,295		7,676
Current portion of capital lease obligation		123,694		203,394		29,295
Current portion of long-term bank borrowings		12,422		12,564		1,810
Deferred government grants		6,332		5,107		736

Total current liabilities		2,772,800		3,185,447		458,801

Non-current liabilities:
Amount due to inter-companies		1,080,118		1,052,734		151,625
Long-term bank borrowings		27,534		219,055		31,550
Non-current portion of capital lease obligations		543,503		581,568		83,763
Unrecognized tax benefits		11,098		24,153		3,479
Deferred tax liabilities		218,522		182,877		26,340
Deferred government grants		31,288		25,886		3,728
Deferred revenue		68,535		62,531		9,006
Mandatorily redeemable noncontrolling interests		100,000		—		—

Total non-current liabilities		2,080,598		2,148,804		309,491

Total liabilities		4,853,398		5,334,251		768,292


	For the Years Ended December 31,
	2014		2015			2016
	RMB		RMB			RMB			US$
Net revenues		2,695,021		3,066,090			2,938,319			423,206
Net profit (loss)		175,521		(35,811	)		(674,685	)		(97,175	)


	For the Years Ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Net cash provided by operating activities		434,865			270,358			141,364			20,361
Net cash (used in) provided by investing activities		(808,117	)		105,635			(470,955	)		(67,832	)
Net cash provided by (used in) financing activities		480,045			(354,408	)		178,283			25,678
Net increase (decrease) in cash and cash equivalents		106,793			21,585			(151,308	)		(21,793	)

(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, 2016

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			3.4 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
Internally use software			7 years
Property management relationship*			9 years

Acquired in the acquisitions of subsidiaries.

Summary of Impairment Charges Associated with Long-Lived Assets and Acquired Intangibles

The Company recorded impairment charges associated with its long-lived assets and acquired intangibles as follows:


	Years ended December 31,
	2014		2015		2016
	RMB		RMB		RMB		US$
Impairment of property and equipment		—		—		238,144		34,300
Impairment of intangible assets		—		—		154,803		22,296

Interest Expense

As a result of total interest costs capitalized during the period, the interest expense for the year ended December 31, 2014, 2015 and 2016, was as follows:


	2014			2015			2016
	RMB			RMB			RMB			US$
Interest expense and amortization cost of bonds		130,355			172,677			113,367			16,328
Interest expense on bank and other borrowings		66,699			55,391			46,377			6,680
Interest expense on capital lease		40,849			57,189			66,687			9,605

Total interest costs		237,903			285,257			226,431			32,613
Less: Total interest costs capitalized		(5,883	)		(11,073	)		(27,842	)		(4,010	)

Interest expense, net		232,020			274,184			198,589			28,603

Acquisitions (Tables)

12 Months Ended

Dec. 31, 2016

Dynamic Ruby Limited

Fair Values of Net Identifiable Assets of FS Zhuoyi

The fair values of the net identifiable assets of FS Zhuoyi at the acquisition day are as follows:


	RMB			US$
Net assets acquired:
Land use right		92,650			13,344
Property		50,950			7,338
Cash and cash equivalents		5,672			817
Other current assets		21			3
Other current liabilities		(51,386	)		(7,401	)
Deferred tax liabilities		(24,757	)		(3,566	)

Total consideration in cash		73,150			10,535

Total Purchase Price Consideration


	RMB
Cash consideration (i)		700,000
Contingent consideration in cash* (ii)		48,971

Total fair value of purchase price consideration		748,971

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.

Total Purchase Price Consideration


	RMB
Cash consideration (i)		598,500
Contingent ordinary shares issuance * (ii) (iii)		355,067

Total fair value of purchase price consideration		953,567

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.

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 contingent consideration related to fiscal year 2014 and 2015 has been resolved and remeasured in April 2015 and April 2016, with its fair value of RMB210,000 and RMB210,000 reclassified to additional paid in capital, respectively. The Company issued 1,923,556 ADS in April 2015 and 1,618,251 ADS in May 2016 in relation to this, respectively.

Total Purchase Price Consideration


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

Total fair value of purchase price consideration		64,232

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.

Accounts and Notes Receivable, Net (Tables)

12 Months Ended

Dec. 31, 2016

Receivables [Abstract]

Accounts and Notes Receivable and Allowance for Doubtful Debt

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


	December 31,
	2015			2016
	RMB			RMB			US$
Accounts receivable		733,558			735,154			105,884
Notes receivable		620			1,215			175

Allowance for doubtful debt		(40,070	)		(80,910	)		(11,653	)

		694,108			655,459			94,406

Analysis of Allowance for Doubtful Debt

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


	December 31,
	2015			2016
	RMB			RMB			US$
Balance at beginning of the year		10,416			40,070			5,771
Provision		30,751			79,637			11,470
Write-off of accounts receivable		(1,097	)		(38,797	)		(5,588	)

Balance at the end of the year		40,070			80,910			11,653

Short-Term Investments (Tables)

12 Months Ended

Dec. 31, 2016

Short-Term Investments

Short-term investments consisted of the following as of December 31, 2015 and 2016:


	December 31,
	2015		2016
	RMB		RMB		US$
Held-to-maturity securities
- Fixed rate time deposits		—		277,946		40,033
- Floating rate principal unguaranteed investments		102,300		—		—

		102,300		277,946		40,033

Inventories (Tables)

12 Months Ended

Dec. 31, 2016

Inventory Disclosure [Abstract]

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

Inventories consisted of the following as of December 31, 2015 and 2016:

December 31,

2015

2016

RMB

US$

Broadband related products

13,539

4,431

638

Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2016

Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:


	December 31,
	2015		2016
	RMB		RMB		US$
Prepaid expenses for bandwidth, rented data centers or cabinets		126,842		163,443		23,541
Staff field advances		20,819		22,429		3,230
Interest receivables		4,936		13,576		1,955
Receivables for the disposal of certain construction-in-progress		20,290		20,290		2,922
Tax recoverables		159,413		309,426		44,567
Deposits		18,191		19,596		2,822
Loan to third parties		119,244		62,433		8,992
Other receivables		172,818		165,938		23,901

		642,553		777,131		111,930

Property and Equipment, Net (Tables)

12 Months Ended

Dec. 31, 2016

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,
	2015			2016
	RMB			RMB			US$
At cost:
Property		439,480			490,430			70,637
Leasehold improvements		398,473			666,051			95,931
Computer and network equipment		2,556,403			2,926,278			421,472
Optical fibers		207,423			207,423			29,875
Office equipment		19,554			19,591			2,822
Motor vehicles		8,289			8,144			1,173

		3,629,622			4,317,917			621,910
Less: accumulated depreciation		(1,088,684	)		(1,342,041	)		(193,294	)
Impairment		—			(238,144	)		(34,300	)

		2,540,938			2,737,732			394,316
Construction-in-progress		1,112,133			1,043,881			150,350

		3,653,071			3,781,613			544,666

Depreciation Expense

Depreciation expense was RMB278,986, RMB402,035 and RMB480,105 (US$69,150) for the years ended December 31, 2014, 2015 and 2016, respectively, and were included in the following captions:


	For the years ended December 31,
	2014		2015		2016
	RMB		RMB		RMB		US$
Cost of revenues		225,680		328,217		397,014		57,182
Sales and marketing expenses		3,397		5,670		3,759		541
General and administrative expenses		19,433		29,753		45,746		6,590
Research and development expenses		30,476		38,395		33,586		4,837

		278,986		402,035		480,105		69,150

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,
	2015			2016
	RMB			RMB			US$
Property		365,353			365,353			52,622
Computer and network equipment		289,346			431,948			62,213
Optical fibers		207,423			207,423			29,875

		862,122			1,004,724			144,710
Less: accumulated depreciation		(138,608	)		(238,765	)		(34,389	)

		723,514			765,959			110,321
Construction-in-progress		142,671			35,906			5,172

		866,185			801,865			115,493

Carrying Amounts of Property, Computer, Network Equipment and Construction-in-Progress Pledged to Secure Banking Borrowings


	December 31,
	2015		2016
	RMB		RMB		US$
Property		22,118		7,938		1,143
Computer and network equipment		37,167		31,506		4,538
Construction-in-progress		—		318,259		45,839

Intangible Assets, Net (Tables)

12 Months Ended

Dec. 31, 2016

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*			Internal use software			Property management relationship*			Total
	RMB			RMB						RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB			RMB
Intangible assets, net January 1, 2015		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
Additions		22,706			—			—			—			—			—			—			—			—			—			23,780			—			46,486
Disposals		—			—			—			—			—			—			—			—			—			—			(243	)		—			(243	)
Foreign currency translation difference		380			7,237			—			—			—			—			—			—			—			—			—			—			7,617
Amortization expense		(15,647	)		(9,730	)		(1,000	)		(6,588	)		(81,783	)		(1,266	)		(25,277	)		(17,908	)		(3,829	)		(5,694	)		(5,772	)		(9,653	)		(184,147	)

Intangible assets, net December 31, 2015		74,471			93,387			16,834			24,926			595,648			16,519			115,727			211,189			7,753			18,504			27,619			71,589			1,274,166
Additions		26,763			—			—			—			—			—			—			—			—			—			12,781			—			39,544
Disposals		(6,531	)		—			—			—			—			—			—			—			—			—			—			—			(6,531	)
Foreign currency translation difference		1,814			7,115			—			—			—			—			—			—			—			—			—			—			8,929
Amortization expense		(23,072	)		(8,934	)		(1,000	)		(6,588	)		(80,349	)		(1,266	)		(25,277	)		(17,908	)		(3,829	)		(5,694	)		(394	)		(9,653	)		(183,964	)
Impairment		—			—			—			—			(102,524	)		(2,696	)		(2,007	)		(24,896	)		—			(3,907	)		—			(18,773	)		(154,803	)

Intangible assets, net December 31, 2016		73,445			91,568			15,834			18,338			412,775			12,557			88,443			168,385			3,924			8,903			40,006			43,163			977,341

Intangible assets, net December 31, 2016 (US$)		10,578			13,189			2,281			2,641			59,452			1,809			12,738			24,252			565			1,282			5,762			6,217			140,766

*	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$
2017		198,732		28,623
2018		182,642		26,306
2019		164,766		23,731
2020		134,359		19,352
2021		124,878		17,986

		805,377		115,998

Land Use Rights, Net (Tables)

12 Months Ended

Dec. 31, 2016

Text Block [Abstract]

Land Use Rights

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


	December 31,
	2015			2016
	RMB			RMB			US$
Cost		66,878			172,658			24,868
Accumulated amortization		(2,196	)		(5,012	)		(722	)

Land use rights, net		64,682			167,646			24,146

Carrying Value of Land Use Rights Pledged by Group to Secure Banking Borrowings

The carrying amounts of land use rights pledged by the Group to secure banking borrowings (Note14) granted to the Group at the respective balance sheet dates were as follows:

December 31,

2015

2016

RMB

US$

Land use rights

—

17,232

2,482

Goodwill (Tables)

12 Months Ended

Dec. 31, 2016

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of Goodwill Acquired by Allocation to Reporting Units

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


	December 31,
	2014		2015		2016
	RMB		RMB		RMB		US$
Balance as of January 1		410,500		1,755,970		1,755,970		252,912
Goodwill acquired		1,345,470		—		—		—

Balance as of December 31		1,755,970		1,755,970		1,755,970		252,912

Following table summarizes the allocated goodwill by each reporting unit:


	RMB		US$
Hosting and related services		989,530		142,522
Managed network services		766,440		110,390

		1,755,970		252,912

Long-Term Investments (Tables)

12 Months Ended

Dec. 31, 2016

Investment in Equity Investees

Long Term Investments

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


	December 31,
	2015		2016
	RMB		RMB		US$
Cost method investments		48,696		56,087		8,078
Equity method investments		150,211		234,863		33,827
Available-for-sale investments		2,597		7,921		1,141

		201,504		298,871		43,046

Investment in equity investees

As of December 31, 2014

Decrease during the year
ended December 31, 2015

As of December 31, 2015

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

101,000

(3,144

)

97,856

—

52,355

101,000

49,211

150,211


	As of December 31, 2015						Increase during the year ended December 31, 2016					As of December 31, 2016
	Cost of investment		Share equity loss		Investment in equity investee		Cost of investment		Share equity gain			Cost of investment		Share equity gain			Investment in equity investee		Investment in equity investee
	RMB		RMB		RMB		RMB		RMB			RMB		RMB			RMB		US$
Yizhuang Fund		101,000		49,211		150,211		—		35,937			101,000		85,148			186,148		26,811
Unis Tech		—		—		—		49,000		(285	)		49,000		(285	)		48,715		7,016

		101,000		49,211		150,211		49,000		35,652			150,000		84,863			234,863		33,827

Debt Disclosure (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Summary of Bank Borrowings

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


	December 31,
	2015		2016
	RMB		RMB		US$
Short-term bank borrowings		276,000		1,683,676		242,500
Long-term bank borrowings, current portion		38,803		39,303		5,661

		314,803		1,722,979		248,161
Long-term bank borrowings, non-current portion		103,421		268,221		38,632

Total bank borrowings		418,224		1,991,200		286,793

Secured or Guaranteed Short Term Bank Borrowings

Bank borrowings as of December 31, 2015 and 2016 were secured/guaranteed by the following:

December 31, 2015


Short-term bank borrowings		Secured/guaranteed by
(RMB)
	50,000	Guaranteed by restricted cash of RMB51,553.
	11,000	Secured by a subsidiary’s building with net book value of RMB13,943 (Note 9).
	215,000	Unsecured borrowings.

	276,000


Long-term bank and other borrowings (including current portion)		Secured/guaranteed by
(RMB)
	16,956	Guaranteed by noncontrolling shareholder of Aipu Group
	4,800	Secured by a subsidiary’s building with net book value of RMB8,175 (Note 9).
	16,778	Secured by a subsidiary’s computer and network equipment with net book value of RMB37,167 (Note 9).
	103,690	Unsecured borrowings.

	142,224

December 31, 2016


Short-term bank borrowings		Secured/guaranteed by
(RMB)
	1,520,000	Guaranteed by restricted cash of RMB1,751,055.
	20,000	Guaranteed by noncontrolling shareholder of Aipu Group.
	143,676	Unsecured borrowings.

	1,683,676


Long-term bank borrowings (including current portion)		Secured/guaranteed by
(RMB)
	1,600	Secured by a subsidiary’s building with net book value of RMB7,938 (Note 9).
	13,817	Secured by a subsidiary’s computer and network equipment with net book value of RMB31,506 (Note 9).
	164,000	Secured by a subsidiary’s construction-in-progress and land use rights with net book value of RMB335,491(Note 9/Note 11).
	128,107	Unsecured borrowings.

	307,524

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


	RMB		US$
For the years ending December 31,
2017		2,143,579		308,741
2018		69,841		10,059
2019		73,380		10,569
2020		45,500		6,553
2021		39,000		5,617
Thereafter		40,500		5,833

Accrued Expenses And Other Payables (Tables)

12 Months Ended

Dec. 31, 2016

Payables and Accruals [Abstract]

Components of Accrued Expenses and Other Payables

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


	December 31,
	2015		2016
	RMB		RMB		US$
Payroll and welfare payables		193,356		248,895		35,848
Business and other taxes payable		25,780		21,011		3,026
Payables for office supplies and utilities		25,497		31,006		4,466
Payables for the purchase of property and equipment		218,165		266,597		38,398
Payable for purchase intangible assets		3,662		2,352		339
Accrued service fees		68,029		74,812		10,775
Interest payables		19,102		6,456		930
Share-settled bonuses		41,352		72,138		10,390
Payable for assets acquisition		21,080		25,268		3,639
Others		21,934		39,381		5,673

		637,957		787,916		113,484

Capital Leases (Tables)

12 Months Ended

Dec. 31, 2016

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$
2017		301,823			43,472
2018		188,679			27,175
2019		94,045			13,545
2020		50,525			7,277
2021 and thereafter		681,773			98,196

Total minimum lease payments		1,316,845			189,665
Less: amount representing interest		(536,499	)		(77,272	)

Present value of remaining minimum lease payments		780,346			112,393

Deferred Government Grants (Tables)

12 Months Ended

Dec. 31, 2016

Deferred Revenue Disclosure [Abstract]

Movements of Deferred Government Grants

Movements of deferred government grants are as follows:


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Balance at beginning of the year		18,046			33,572			37,620			5,418
Additions		20,920			10,160			—			—
Recognized as a reduction of depreciation expense		(5,394	)		(6,112	)		(6,627	)		(954	)

Balance at end of the year		33,572			37,620			30,993			4,464

Accumulated Other Comprehensive (Loss) Income (Tables)

12 Months Ended

Dec. 31, 2016

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

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


	Foreign currency translation			Total
	RMB			RMB
Balance as of January 1, 2014		(82,589	)		(82,589	)
Current year other comprehensive income		16,835			16,835

Balance as of December 31, 2014		(65,754	)		(65,754	)
Current year other comprehensive income		41,518			41,518

Balance as of December 31, 2015		(24,236	)		(24,236	)
Current year other comprehensive income		142,526			142,526

Balance as of December 31, 2016		118,290			118,290

Balance as of December 31, 2016, in US$		17,037			17,037

Share Based Compensation (Tables)

12 Months Ended

Dec. 31, 2016

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

Summary of Employee Share Option Activity Under Twenty Ten Plan

The following table summarizes 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, 2016		4,180,198			0.39		6.1
Granted		2,835			0.85
Exercised		(2,195,268	)		0.30
Forfeited		—			—

Outstanding, December 31, 2016		1,987,765			0.49		4.6		1,399

Vested and expected to vest at December 31, 2016		1,987,765			0.49		4.6		1,374

Exercisable as of December 31, 2016		1,984,930			0.47		4.5		1,387

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, 2016		1,773,060			19.14		8.6
Granted		646,940			8.85
Vested		(1,159,664	)		12.80
Forfeited/Cancelled⁽¹⁾		(447,638	)		1.56

Unvested, December 31, 2016		812,698			13.25		8.5		16,820

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, 2014, 2015 and 2016 is as follows:


	For the year ended December 31,
	2014		2015		2016
	RMB		RMB		RMB			US$
Cost of revenues		7,163		12,422		(4,110	)		(592	)
Sales and marketing expenses		13,482		13,488		2,490			359
General and administrative expenses		208,914		153,814		123,273			17,755
Research and development expenses		4,176		10,303		(2,924	)		(421	)

		233,735		190,027		118,729			17,101

Taxation (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Profit or Loss Before Income Taxes

Loss before income taxes consists of:


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Non-PRC		(485,539	)		(256,279	)		(155,364	)		(22,377	)
PRC		173,735			(97,166	)		(787,718	)		(113,454	)

		(311,804	)		(353,445	)		(943,082	)		(135,831	)

Income Tax (Expense) Benefits

Income tax (expense) benefits comprises of:


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Current		(45,401	)		(68,092	)		(54,772	)		(7,889	)
Deferred		28,728			20,262			65,932			9,496

		(16,673	)		(47,830	)		11,160			1,607

Reconciliation Tax Computed Applying Statutory Income Tax Rate


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Loss before income taxes		(311,804	)		(353,445	)		(943,082	)		(135,831	)

Income tax benefit computed at applicable tax rates (25%)		77,951			88,361			235,770			33,958
Non-deductible expenses		(6,095	)		(19,216	)		(16,610	)		(2,392	)
Research and development expenses		6,879			6,871			7,766			1,119
Effect of tax holidays		6,305			2,743			1,691			244
Preferential rate		20,049			6,183			(11,060	)		(1,593	)
Current and deferred tax rate differences		(8,553	)		(2,876	)		(1,521	)		(219	)
International rate differences		(108,066	)		(90,773	)		(51,392	)		(7,402	)
Tax exempted income		2,118			—			9,878			1,423
Unrecognized tax benefits		3,872			(529	)		(14,525	)		(2,092	)
Deferred tax expense		(3,109	)		(387	)		1,516			218
Change in valuation allowance		(7,704	)		(36,529	)		(158,724	)		(22,861	)
Prior year provision to return true up		(320	)		(1,678	)		8,371			1,204

Income tax (expense) benefits		(16,673	)		(47,830	)		11,160			1,607

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,
	2014		2015		2016
	RMB		RMB		RMB		US$
Basic		0.016		0.006		0.003		0.000

Diluted		0.016		0.006		0.003		0.000

Significant Components of Deferred Taxes

The significant components of deferred taxes are as follows:


	December 31,
	2015			2016
	RMB			RMB			US$
Deferred tax assets
Current
Allowance for doubtful debt		7,533			25,224			3,633
Accrued salary and welfare		22,843			30,236			4,355
Accrued expenses		4,474			3,955			570
Property and equipment		1,487			1,612			232
Deferred government grant-current		321			201			29
Valuation allowance		(5,545	)		(17,866	)		(2,574	)

Net current deferred tax assets		31,113			43,362			6,245

Non-current
Tax losses		46,283			202,485			29,164
Property and equipment		18,783			13,486			1,942
Intangible assets		1,772			1,254			181
Capital lease		15,061			23,364			3,365
Deferred government grant-non-current		5,259			4,700			677
Depreciation and amortization generated from acquisitions		7,163			5,849			842
Valuation allowance		(47,421	)		(193,824	)		(27,916	)

Net non-current deferred tax assets		46,900			57,314			8,255

Total deferred tax assets		78,013			100,676			14,500

Non-current
Intangible assets		204,236			148,003			21,317
Property and equipment		69,038			92,687			13,350
Capitalized interest expense		6,700			11,789			1,698
Gain generated from equity method investments		13,238			22,221			3,200

Total non-current deferred tax liabilities		293,212			274,700			39,565

Unrecognized Tax Benefits

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


	For the year ended December 31,
	2015			2016
	RMB			RMB			US$
Balance at beginning of year		16,682			11,802			1,700
Reversal based on tax positions related to prior years		(11,144	)		(258	)		(37	)
Additions based on tax positions related to the current year		6,264			11,676			1,682

Balance at end of year		11,802			23,220			3,345

Parent Company Only Condensed Financial Information (Tables)

12 Months Ended

Dec. 31, 2016

Related Party Transactions

Other than disclosed elsewhere, the Company had the following significant related party transactions for the years ended December 31, 2014, 2015 and 2016:


	For the years ended December 31,
	2014		2015		2016
	RMB		RMB		RMB		US$
Services provided to:
- Xiaomi Communication		—		27,144		113,458		16,341
- BJ Kingsoft		—		7,969		19,471		2,804
- BJ Xiaomi		—		275		11,689		1,684
- BJ Cheetah		—		6,712		9,478		1,365
- CD Xishanju		—		3,379		2,320		334
- TW Xiaomi		—		91		93		13
- Upwise		143		204		—		—
- DCS		18		73		—		—
- DIC		—		508		—		—

Services provided by:
- DCSS		—		—		10,883		1,567
- DIC		4,106		10,764		7,053		1,016
- WNT Technology		—		—		2,125		306
- BJ Kingsoft		—		—		1,045		151
- DCS		587		9,259		—		—
- Upwise		97		253		—		—

Purchases of equipment and property from:
- DIC		—		—		3,079		443
- SZ Youpusi		80,059		3,577		1,410		203
- DCS		330		—		—		—
- CD Xingpu		—		37,101		—		—

Loans provided to:
- Seller of Aipu Group		98,500		—		—		—
- BitCool Media		22,792		—		—		—

Loan from:
- CD Guotao		—		—		3,483		502

Repayment of loans:
- BitCool Media		35,380		—		—		—

Receipt of interest income from loan to:
- BitCool Media		1,553		—		—		—

Interest income from loan to:
- BitCool Media		956		1,211		—		—

Management service provided by:
- DCS		8,949		16,602		—		—

Future Minimum Lease Payments Under Non Cancelable Operating Leases

As of December 31, 2016, 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$
2017		124,557		17,940
2018		77,354		11,141
2019		49,505		7,130
2020		35,985		5,183
2021 and thereafter		157,641		22,705

		445,042		64,099

Parent Company

Related Party Transactions

The Company had the following related party balances as of December 31, 2015 and 2016:


	December 31,
	2015		2016
	RMB		RMB		US$
Amount due from subsidiaries
- 21Vianet HK		2,997,103		3,037,249		437,455
- Xi’an Holding		6,563		7,011		1,010
- Ventures		19,546		27,124		3,907
- Asia Cloud Technology		4,157		—		—
- WiFire Group		649		4,301		619
- Fastweb Technology		54,364		60,574		8,724
- 21V Mobile		71,031		72,361		10,422

		3,153,413		3,208,620		462,137

Amount due from related parties
Current:
- Seller of iJoy		25,974		27,748		3,997
- Seller of Aipu Group		—		70,000		10,082

		25,974		97,748		14,079

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

Amount due to subsidiaries
- 21Vianet Technology		7		7		1
- 21Vianet Beijing		3,719		9,713		1,400
- 21Vianet China		2		2		—
- DYX		—		10		1

		3,728		9,732		1,402


	December 31,
	2015		2016
	RMB		RMB		US$
Amount due to related parties
Current:
- Sellers of WiFire BJ &Yilong		2,970		—		—
- Seller of Aipu Group		76,666		30,000		4,321
- Seller of Dermot Entities		205,800		—		—
- Seller of iJoy		61,436		38,131		5,492

		346,872		68,131		9,813

Non-current:
- Sellers of Tianying		16,350		—		—
- Seller of Aipu Group		11,034		—		—

		27,384		—		—

Future Minimum Lease Payments Under Non Cancelable Operating Leases


	RMB		US$
2017		18,532		2,669
2018		18,996		2,736
2019		19,471		2,804
2020		19,957		2,874
2021 and thereafter		90,486		13,033

		167,442		24,116

Condensed Balance Sheets

Condensed balance sheets


	Note			As of December 31,
				2015			2016
				RMB			RMB			US$
ASSETS
Current assets
Cash					798,200			596,871			85,967
Restricted cash					—			1,759,726			253,453
Short-term investments					—			277,946			40,033
Prepaid expenses and other current assets					66,287			103,271			14,874
Amount due from a related party		(b	)		25,974			97,748			14,079
Amount due from subsidiaries		(b	)		3,153,413			3,208,620			462,137

Total current assets					4,043,874			6,044,182			870,543

Non-current assets
Investments in subsidiaries					2,565,783			2,133,242			307,251
Amount due from a related party		(b	)		70,000			—			—
Other non-current assets					6,123			—			—

Total non-current assets					2,641,906			2,133,242			307,251

Total assets					6,685,780			8,177,424			1,177,794

LIABILITIES AND SHAREHOLDERS’ EQUITY
Current liabilities:
Accrued expenses and other payables					14,826			38,599			5,560
Short-term bank borrowings					—			1,500,000			216,045
Account payables					5,929			10,672			1,537
Interest payable					7,829			5,759			829
Amount due to related parties		(b	)		346,872			68,131			9,813
Amount due to subsidiaries		(b	)		3,728			9,732			1,402
Bonds payable		(d	)		264,250			419,316			60,394

Total current liabilities					643,434			2,052,209			295,580

Non-current liabilities
Amount due to related parties		(b	)		27,384			—			—
Bonds payable		(d	)		2,000,000			—			—

Total non-current liabilities					2,027,384			—			—

Total liabilities					2,670,818			2,052,209			295,580

Shareholders’ equity:
Class A Ordinary shares (par value of US$0.00001 per share; 1,200,000,000 and 1,200,000,000 shares authorized; 458,916,346 and 505,207,968 shares issued and outstanding as of December 31, 2015 and 2016, respectively)					30			33			4
Class B Ordinary shares (par value of US$0.00001 per share; 300,000,000 and 300,000,000 shares authorized; 63,596,248 and 174,649,638 shares issued and outstanding as of December 31, 2015 and 2016, respectively)					4			12			2
Additional paid-in capital					6,403,117			9,015,846			1,298,551
Accumulated other comprehensive (loss) income					(24,236	)		118,290			17,037
Accumulated deficit					(2,170,811	)		(2,804,409	)		(403,918	)
Treasury stock					(193,142	)		(204,557	)		(29,462	)

Total shareholders’ equity					4,014,962			6,125,215			882,214

Total liabilities and shareholders’ equity					6,685,780			8,177,424			1,177,794

Condensed Statements of Operations

Condensed statements of operations


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Operating Expenses
General and administrative expenses		(125,859	)		(166,662	)		(124,450	)		(17,923	)
Changes in the fair value of contingent purchase consideration payables		(22,629	)		(43,325	)		93,307			13,439

Operating loss		(148,488	)		(209,987	)		(31,143	)		(4,484	)
Other income		(199,418	)		(152,100	)		(169,915	)		(24,473	)
Share of losses from subsidiaries and Consolidated VIEs		(574	)		(66,012	)		(432,540	)		(62,299	)

Loss before income taxes		(348,480	)		(428,099	)		(633,598	)		(91,256	)
Income tax expense		—			—			—			—

Net loss		(348,480	)		(428,099	)		(633,598	)		(91,256	)

Condensed Statements of Comprehensive Loss

Condensed statements of comprehensive loss


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Net loss		(348,480	)		(428,099	)		(633,598	)		(91,256	)
Other comprehensive loss, net of tax of nil:
Foreign currency translation adjustments, net of tax of nil		16,835			41,518			142,526			20,528

Other comprehensive loss, net of tax of nil:		16,835			41,518			142,526			20,528

Comprehensive loss		(331,645	)		(386,581	)		(491,072	)		(70,728	)

Comprehensive loss attributable to the Company’s ordinary shareholders		(331,645	)		(386,581	)		(491,072	)		(70,728	)

Condensed Statements of Cash Flows

Condensed statements of cash flows


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
Net cash used in operating activities		(23,952	)		(26,621	)		(78,567	)		(11,316	)
Net cash used in investing activities		(1,186,053	)		(977,300	)		(617,613	)		(88,955	)
Net cash generated from financing activities		623,214			1,798,230			494,851			71,273

Net (decrease) increase in cash		(586,791	)		794,309			(201,329	)		(28,998	)
Cash at beginning of the year		590,682			3,891			798,200			114,965

Cash at end of the year		3,891			798,200			596,871			85,967

Related Party Transactions (Tables)

12 Months Ended

Dec. 31, 2016

Related Party Balances

The Company had the following related party balances as of December 31, 2015 and 2016:


	December 31,
	2015		2016
	RMB		RMB		US$
Amounts due from related parties:
Current:
- Seller of Aipu Group		28,500		98,500		14,187
- Seller of iJoy		25,974		27,748		3,997
- Xiaomi Communication		9,367		22,473		3,237
- CD Xingpu		—		12,466		1,795
- SH Shibei		9,800		9,800		1,411
- BJ Cheetah		2,590		4,776		688
- BJ Kingsoft		3,561		3,864		557
- BJ Xiaomi		—		1,631		235
- SZ Youpusi		863		817		118
- CD Xishanju		1,469		256		37
- TW Xiaomi		20		—		—
- Bitcool Media		22,605		—		—
- Upwise		327		—		—
- DCS		61		—		—
- Others		—		284		40

		105,137		182,615		26,302

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

Amounts due to related parties:
Current:
- Seller of the Managed Network Entities		47,755		47,755		6,878
- Seller of iJoy		61,436		38,131		5,492
- Seller of Aipu Group		76,666		30,000		4,321
- CD Guotao		—		3,483		502
- BJ Kingsoft		—		1,105		159
- SZ Youpusi		—		667		96
- DCS		894		—		—
- Xiaomi Technology		210		361		52
- CD Xingpu		1,000		43		6
- DIC		789		11		2
- Seller of WiFire BJ and Yilong		2,970		—		—
- Sellers of Dermot Entities		205,800		—		—
- Upwise		41		—		—
- CD Kingsoft		5		—		—
- BJ Cheetah		22		—		—
- Others		—		372		53

		397,588		121,928		17,561


	December 31,
	2015		2016
	RMB		RMB		US$
Non-current:
- Seller of Tianying		16,350		—		—
- Seller of Aipu Group		11,034		—		—

		27,384		—		—

Segment Reporting (Tables)

12 Months Ended

Dec. 31, 2016

Segment Reporting [Abstract]

Summary of Operating Segment

The table below provides a summary of the Group’s operating segment results for the years ended December 31, 2014, 2015 and 2016.


	For the years ended December 31,
	2014			2015			2016			2016
	RMB			RMB			RMB			US$
	(In thousands)
Hosting and related services
Revenues		1,505,233			2,369,223			2,668,655			384,366
Operating profit (loss)		9,882			(64,658	)		44,101			6,352
Managed network services
Revenues		1,371,214			1,265,149			973,119			140,159
Operating loss		(124,582	)		(219,575	)		(884,297	)		(127,365	)


Group consolidated revenue		2,876,447			3,634,372			3,641,774			524,525
Group consolidated operating loss		(114,700	)		(284,233	)		(840,196	)		(121,013	)

Loss Per Share (Tables)

12 Months Ended

Dec. 31, 2016

Earnings Per Share [Abstract]

Basic and Diluted Loss Per Share

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


	For the year ended December 31,
	2014			2015			2016
	RMB			RMB			RMB			US$
*Numerator:*
Net loss		(328,477	)		(401,275	)		(931,922	)		(134,224	)
Net (profit) loss attributable to noncontrolling interest and redeemable noncontrolling interest		(20,003	)		(26,824	)		298,324			42,968

Net loss attributable to ordinary shareholders		(348,480	)		(428,099	)		(633,598	)		(91,256	)
Plus: (Increase) decrease in accretion of redeemable noncontrolling interests		(7,850	)		7,850			(210,485	)		(30,316	)

Adjusted net loss attributable to ordinary shareholders		(356,330	)		(420,249	)		(844,083	)		(121,572	)

*Denominator:*
Weighted-average number of shares outstanding—basic		401,335,788			492,065,239			617,169,833			617,169,833
Weighted-average number of shares outstanding—diluted		401,335,788			492,065,239			617,169,833			617,169,833
Loss per share—Basic:
Net loss		(0.89	)		(0.85	)		(1.37	)		(0.20	)

		(0.89	)		(0.85	)		(1.37	)		(0.20	)

Loss per share—Diluted:
Net loss		(0.89	)		(0.85	)		(1.37	)		(0.20	)

		(0.89	)		(0.85	)		(1.37	)		(0.20	)

Redeemable Noncontrolling Interests (Tables)

12 Months Ended

Dec. 31, 2016

Noncontrolling Interest [Abstract]

Redeemable Non Controlling Interests

	For the year ended December 31,
	2014		2015			2016
	RMB		RMB			RMB			US$
Balance as of January 1		—		773,706			790,229			113,817
Acquisition of Aipu Group (Note 4)		748,040		—			—			—
Current profit (loss)		17,816		24,373			(300,714	)		(43,312	)
Increase (decrease) in accretion of redeemable noncontrolling interests		7,850		(7,850	)		210,485			30,316

Balance as of December 31		773,706		790,229			700,000			100,821

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2016

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, 2015
	RMB		RMB		RMB		RMB
Cash equivalents:
- Fixed rate time deposits		771,723		—		—		771,723

Held-to-maturity short-term investments:
- Floating rate principal unguaranteed investments		—		102,300		—		102,300

Long-term investments:
- Available-for-sale investments		—		—		2,597		2,597

Assets		771,723		102,300		2,597		876,620

Long-term borrowings:
- Bonds payable		2,193,744		—		—		2,193,744

Other liabilities:
- Share-settled bonuses		—		—		41,352		41,352
- Mandatorily redeemable noncontrolling interests in Asia Cloud Investment		—		—		100,000		100,000

Amounts due to related parties:
- Contingent consideration payables in relation to the acquisition of subsidiaries		—		—		372,256		372,256

Liabilities		2,193,744		—		513,608		2,707,352


	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, 2016
	RMB		RMB		RMB		RMB		US$
Cash equivalents:
- Fixed rate time deposits		588,589		—		—		588,589		84,774

Held-to-maturity short-term investments:
- Fixed rate time deposits		277,946		—		—		277,946		40,033

Long-term investments
- Available-for-sale investments		—		—		7,921		7,921		1,141

Assets		866,535		—		7,921		874,456		125,948

Long-term borrowings:
- Bonds payable		418,497		—		—		418,497		60,276

Other liabilities:
- Share-settled bonuses		—		—		37,526		37,526		5,405
- Liability classified RSU						34,612		34,612		4,985

Amounts due to related parties:
- Contingent consideration payable in relation to the acquisition of subsidiaries		—		—		65,797		65,797		9,477

Liabilities		418,497		—		137,935		556,432		80,143

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 payables
	RMB
Fair value at January 1, 2015		548,017
Changes in the fair value		43,325
Payment of cash consideration		(4,543	)
Reclassification to equity upon resolution of contingencies		(214,543	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2015		372,256

Changes in the fair value		(93,307	)
Payment of cash consideration		(2,617	)
Reclassification to equity upon resolution of contingencies		(210,535	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2016		65,797

Fair value at December 31, 2016 (US$)		9,477


	Share-settled bonuses
	RMB
Fair value at January 1, 2015		14,913
Increase in bonuses settled in shares during 2015		41,146
Changes in the fair value		5,683
Reclassification to equity		(19,072	)
Reclassification to “Accrued expenses and other payables-Others”		(1,318	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2015		41,352

Increase in bonuses settled in shares during 2016		37,678
Changes in the fair value		(5,319	)
Reclassification to equity		(15,890	)
Reclassification to “Accrued expenses and other payables-Others”		—
Bonuses settled in cash during 2016		(20,295	)
Transfers in and/or out of Level 3		—

Fair value at December 31, 2016		37,526

Fair value at December 31, 2016 (US$)		5,405


	Liability classified RSU
	RMB
Fair value at January 1, 2016		—
Increase in liability classified RSU		36,834
Reclassification to equity		(2,222	)
Transfers in and/or out of Level 3		—
Fair value at December 31, 2016		34,612

Fair value at December 31, 2016 (US$)		4,985


	Mandatorily redeemable noncontrolling interests in Asia Cloud Investment
	RMB
Fair value at January 1, 2016		100,000
Changes in the fair value		—
Transfers in and/or out of Level 3 (Note 1(c))		(100,000	)

Fair value at December 31, 2016		—

Fair value at December 31, 2016 (US$)		—

Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances.

Computer and Network Equipment and Construction in Progress

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

Purchase Commitments

As of December 31, 2016, the Company has the following commitments to purchase certain computer and network equipment and construction in progress:


	RMB		US$
2017		140,834		20,284
2018		33,531		4,829
2019		13,916		2,004

		188,281		27,117

Bandwidth and Cabinet Capacity

Purchase Commitments

As of December 31, 2016, the Company had outstanding purchase commitments in relation to bandwidth and cabinet capacity consisting of the following:


	RMB		US$
2017		1,141,347		164,388
2018		48,959		7,052
2019		37,352		5,380
2020		35,317		5,087
2021 and thereafter		96,891		13,955

		1,359,866		195,862

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

12 Months Ended

Dec. 31, 2016

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]

Hong Kong 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@Xian Holding Limited ("21V Xi'an Holding") | Subsidiaries

Trading of network equipment

^[1]

Jul. 05, 2012

^[3]

British Virgin Islands

^[3]

100.00%

^[3]

21Vianet (Xi'an) Technology Co., Ltd. ("Xi'an Tech") | Subsidiaries

Investment holding

^[3]

Jul. 05, 2012

^[1],[3]

PRC

^[1],[3]

100.00%

^[1],[3]

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

Provision of technical and internet data center

^[1],[3]

Mar. 04, 2013

^[1]

PRC

^[1]

100.00%

^[1]

21Vianet Mobile Limited ("21V Mobile") | Subsidiaries

Provision of internet data center services

^[1]

Apr. 30, 2013

^[4]

Hong Kong

^[4]

100.00%

^[4]

Joytone Infotech Co., Ltd. ("SZ Zhuoaiyi") | Subsidiaries

Investment holding

^[4]

Apr. 30, 2013

^[1],[4]

PRC

^[1],[4]

100.00%

^[1],[4]

21Vianet Ventures Limited (Ventures) | Subsidiaries

Provision of technical and consultation services

^[1],[4]

Mar. 06, 2014

Hong Kong

100.00%

WiFire Group Inc. ("WiFire Group") | Subsidiaries

Investment holding

Mar. 07, 2014

British Virgin Islands

100.00%

Abitcool (China) Broadband Inc. ("aBitCool DG") | Subsidiaries

Investment holding

Jun. 13, 2014

^[1]

PRC

^[1]

100.00%

^[1]

Diyixian.com Limited ("Diyixian.com") | Subsidiaries

Dormant company

^[1]

Aug. 10, 2014

^[5]

Hong Kong

^[5]

100.00%

^[5]

Dermot Holding Limited ("Dermot BVI") | Subsidiaries

Provision of virtual private network services

^[5]

Aug. 08, 2014

^[5]

British Virgin Islands

^[5]

100.00%

^[5]

21Vianet Zhuhai Financial Leasing Limited | Subsidiaries

Investment holding

^[5]

Apr. 09, 2015

^[1]

PRC

^[1]

100.00%

^[1]

Foshan Zhuoyi Intelligence Date Co., Ltd. ("FS Zhuoyi") | Subsidiaries

Provision of financial leasing business services

^[1]

Jul. 07, 2016

^[1],[6]

PRC

^[1],[6]

100.00%

^[1],[6]

Beijing Yiyun Network Technology Co., Ltd. (formerly known as [Beijing aBitCool Network Technology Co., Ltd.]) ("21Vianet Technology") | Variable Interest Entities

Dormant company

^[1],[6]

Oct. 22, 2002

^[1],[7]

PRC

^[1],[7]

0.00%

^[1],[7]

Beijing iJoy Information Technology Co., Ltd. ("BJ iJoy") | Variable Interest Entities

Provision of internet data center and managed network services

^[1],[7]

Apr. 30, 2013

^[1],[4],[7]

PRC

^[1],[4],[7]

0.00%

^[1],[4],[7]

WiFire Network Technology (Beijing) Co., Ltd. (formerly known as aBitCool Small Micro Network Technology (BJ) Co., Ltd.) (WiFire Network) | Variable Interest Entities

Provision of internet data center, content delivery network services

^[1],[4],[7]

Apr. 01, 2014

^[1],[7]

PRC

^[1],[7]

0.00%

^[1],[7]

Shanghai iJoy Information Technology Co., Ltd. ("SH iJoy") | Variable Interest Entities | Held directly by BJ iJoy

Provision of telecommunication services

^[1],[7]

May 30, 2013

^[1],[4],[7]

PRC

^[1],[4],[7]

0.00%

^[1],[4],[7]

Beijing 21ViaNet Broadband Data Center Co., Ltd ("21Vianet Beijing") | Variable Interest Entities | Held Directly by 21 Vianet Technology

Provision of internet data center, content delivery network services

^[1],[4],[7]

Mar. 15, 2006

^[1],[7]

PRC

^[1],[7]

0.00%

^[1],[7]

21Vianet (Xi'an) Information Outsourcing Industry Park Services Co., Ltd. ("Xi'an Sub") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of internet data center and managed network services

^[1],[7]

Jun. 23, 2008

^[1],[7]

PRC

^[1],[7]

0.00%

^[1],[7]

Beijing Chengyishidai Network Technology Co., Ltd. ("CYSD") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of internet data center services

^[1],[7]

Sep. 30, 2010

^[1],[7],[8]

PRC

^[1],[7],[8]

0.00%

^[1],[7],[8]

Zhiboxintong (Beijing) Network Technology Co., Ltd. ("ZBXT") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of managed network services

^[1],[7],[8]

Sep. 30, 2010

^[1],[7],[8]

PRC

^[1],[7],[8]

0.00%

^[1],[7],[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],[7],[8]

Oct. 08, 2011

^[1],[7]

PRC

^[1],[7]

0.00%

^[1],[7]

Langfang Xunchi Computer Data Processing Co., Ltd. ("LF Xunchi") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Provision of managed network services

^[1],[7]

Dec. 19, 2011

^[1],[7]

PRC

^[1],[7]

0.00%

^[1],[7]

Beijing Fastweb Network Technology Co., Ltd. ("BJ Fastweb") | Variable Interest Entities | Held Directly by 21 Vianet Beijing

Dormant company

^[1],[7]

Sep. 09, 2012

^[1],[2],[7]

PRC

^[1],[2],[7]

0.00%

^[1],[2],[7]

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],[7]

Mar. 21, 2013

^[1],[7]

PRC

^[1],[7]

0.00%

^[1],[7]

WiFire (Beijing) Technology Co., Ltd. (formerly known as 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],[7]

Feb. 28, 2013

^[1],[7],[9]

PRC

^[1],[7],[9]

0.00%

^[1],[7],[9]

Beijing Yilong Xinda 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],[7],[9]

Feb. 28, 2013

^[1],[7],[9]

PRC

^[1],[7],[9]

0.00%

^[1],[7],[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],[7],[9]

Sep. 30, 2014

^[1],[7],[10]

PRC

^[1],[7],[10]

0.00%

^[1],[7],[10]

Sichuan Aipu Network Co., Ltd. ("SC Aipu") | Variable Interest Entities | Held Directly By LF Xunchi

Dormant Company

^[1],[7],[10]

May 31, 2014

^[1],[7],[11]

PRC

^[1],[7],[11]

0.00%

^[1],[7],[11]

DYXnet Limited ("DYXnet") | Variable Interest Entities | Held directly by DYX

Provision of community network services and business network services

^[1],[7],[11]

Aug. 10, 2014

^[5]

Hong Kong

^[5]

100.00%

^[5]

Shenzhen Diyixian Telecommunication Co., Ltd. ("SZ DYX") | Variable Interest Entities | Held by DYX and LF Xunch

Dormant Company

^[5]

Aug. 10, 2014

^[1],[5]

PRC

^[1],[5]

50.00%

^[1],[5]

Cash and cash equivalents

Provision of virtual private network services

^[1],[5]

[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").
[3]	On July 5, 2012, the Company through its wholly-owned subsidiary, 21Vianet HK, acquired 100% equity interests in 21V Xi'an Holding and its subsidiaries (collectively referred to as "21V Xi'an").
[4]	On April 30, 2013, the Company acquired 100% equity interest in 21V Mobile and its subsidiaries (collectively referred to as "iJoy").
[5]	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).
[6]	On July 7, 2016, the Company through its subsidiary, 21Vianet HK acquired 100% equity interest in the entity, which was accounted for an assets acquisition (Note 4).
[7]	Collectively, the "Consolidated VIEs".
[8]	On September 30, 2010, 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 WiFire BJ and BJ Yilong. (collectively referred to as "WiFire BJ and Yilong").
[10]	On September 30, 2014, the Company through its subsidiary, 21Vianet Beijing acquired 100% equity interest in the entity, which was accounted for an assets 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 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)	Jul. 07, 2016	Sep. 30, 2014	Aug. 10, 2014	May 31, 2014	Apr. 30, 2013	Feb. 28, 2013	Sep. 09, 2012	Jul. 05, 2012
Foshan Zhuoyi Intelligence Date Co., Ltd. ("FS Zhuoyi")
Business Acquisition [Line Items]
Business acquisition, equity interests acquired	100.00%
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%
iJoy
Business Acquisition [Line Items]
Business acquisition, equity interests acquired					100.00%
21ViaNet Group Limited ("21Vianet HK")
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%
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 \| WiFire BJ and Yilong
Business Acquisition [Line Items]
Business acquisition, equity interests acquired						100.00%

Organization - Additional Information (Detail) $ in Thousands				1 Months Ended	12 Months Ended
	Dec. 19, 2016	Jul. 31, 2013	Jul. 30, 2013 CNY (¥)	Jan. 31, 2011 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 USD ($) Entity	Dec. 31, 2016 CNY (¥) Entity	Dec. 31, 2015 CNY (¥)
Organization [Line Items]
Number of additional VIEs controlled through Primary Beneficiaries \| Entity						2	2
Assets pledged as collateral						$ 48,321	¥ 335,491,000
Unconsolidated VIE's carrying amount of assets						0	0
Unconsolidated VIE's carrying amount of liabilities						0	0
Maximum exposure to loss related to arrangements with variable interest entity							56,713,000
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%
Dongguan Asia Cloud Investment Co. Ltd. ("Asia Cloud Investment") \| Minimum
Organization [Line Items]
Investment consideration at time of repurchase			¥ 100,000,000
Dongguan Asia Cloud Investment Co. Ltd. ("Asia Cloud Investment") \| Variable Interest Entities
Organization [Line Items]
Contributed capital			1,000,000,000
Dongguan Asia Cloud Investment Co. Ltd. ("Asia Cloud Investment") \| Variable Interest Entities \| 21Vianet Hong Kong Entities
Organization [Line Items]
Contributed capital			¥ 900,000,000
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			¥ 100,000,000
Minority interest ownership percentage			10.00%
Long Term Bank Borrowings
Organization [Line Items]
Loans, aggregate principal amount			¥ 900,000,000
Debt instrument, stated rate			4.00%
Long Term Bank Borrowings \| Term Loan One
Organization [Line Items]
Debt instrument, maturity date		Aug. 28, 2015
Long Term Bank Borrowings \| Term Loan Two
Organization [Line Items]
Debt instrument, maturity date		Sep. 10, 2015
Short-term investments
Organization [Line Items]
Held-to-maturity securities						$ 40,033	¥ 277,946,000	¥ 102,300,000
Short-term investments \| Floating Rate Principal Unguaranteed Investments
Organization [Line Items]
Held-to-maturity securities								¥ 102,300,000
Option Agreement
Organization [Line Items]
Exclusive option price					¥ 1,000
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, 2026				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, 2026				Dec. 18, 2016
Service fee per hour					¥ 1,000
Loan Agreement \| Shareholders \| Loan one
Organization [Line Items]
Loan facility provided to related parties				¥ 7,000,000
Loan Agreement \| Shareholders \| Loan Two
Organization [Line Items]
Loan facility provided to related parties				¥ 3,000,000

Consolidated VIE Included in Accompanying Consolidated Financial Statements (Detail)
¥ in Thousands, $ in Thousands

12 Months Ended

Dec. 31, 2016

USD ($)

Dec. 31, 2016

CNY (¥)

Dec. 31, 2015

CNY (¥)

Dec. 31, 2014

CNY (¥)

Dec. 31, 2016

CNY (¥)

Dec. 31, 2015

USD ($)

Dec. 31, 2015

CNY (¥)

Dec. 31, 2013

CNY (¥)

Current assets:

$ 186,867

¥ 644,415

¥ 1,297,418

$ 242,698

¥ 1,685,054

¥ 1,458,856

Restricted cash

282,812

1,963,561

195,230

Prepaid expenses and other current assets

638

4,431

13,539

Short-term investments

40,033

277,946

102,300

111,930

777,131

642,553

Amounts due from related parties

6,245

43,362

31,113

26,302

182,615

105,137

Total current assets

749,233

5,201,923

3,469,034

Non-current assets:

Property and equipment, net

544,666

3,781,613

3,653,071

Intangible assets, net

140,766

1,404,453

977,341

1,274,166

Land use rights, net

24,146

167,646

64,682

252,912

1,755,970

252,912

1,755,970

¥ 410,500

Short-term bank borrowings

8,255

57,314

46,900

Other non-current assets

21,216

147,302

183,868

Long-term investments

43,046

298,871

201,504

Total non-current assets

1,039,838

7,219,601

7,378,676

Total assets

1,789,071

12,421,524

10,847,710

Current liabilities:

242,500

1,683,676

276,000

Accounts and notes payable

76,274

529,569

482,622

Accrued expenses and other payables

113,484

787,916

637,957

Advance from customers

29,007

201,397

185,800

Income tax payable

3,154

21,899

49,959

Amount due to related parties

46,093

320,023

342,105

17,561

121,928

397,588

Current portion of capital lease obligation

35,103

243,723

140,488

Total current liabilities

736

5,107

6,332

629,967

4,373,857

2,821,019

Non-current liabilities:

Non-current portion of capital lease obligations

77,290

536,623

579,070

Unrecognized tax benefits

4,132

28,689

14,492

Deferred tax liabilities

39,565

274,700

293,212

3,728

25,886

31,288

Mandatorily redeemable noncontrolling interests

9,006

62,531

68,535

100,821

773,706

700,000

$ 113,817

790,229

Total non-current liabilities

172,353

1,196,650

3,202,087

Total liabilities

802,320

5,570,507

6,023,106

Net revenues

524,525

¥ 3,641,774

¥ 3,634,372

2,876,447

Net profit (loss)

(134,224)

(931,922)

(401,275)

(328,477)

Net cash provided by operating activities

12,046

83,620

216,834

325,365

Net cash (used in) provided by investing activities

(121,132)

(841,017)

(370,130)

(2,261,797)

Net cash provided by (used in) financing activities

30,169

209,472

1,115,032

1,121,732

Net increase (decrease) in cash and cash equivalents

(55,831)

(387,636)

1,040,639

(814,441)

Variable Interest Entity, Primary Beneficiary

Current assets:

Cash and cash equivalents

34,549

239,874

391,182

Restricted cash

9,896

68,709

135,875

Accounts receivable (net of allowance for doubtful debt of RMB39,010 and RMB80,313 (US$11,567) as of December 31, 2015 and 2016, respectively)

80,010

555,509

630,582

Prepaid expenses and other current assets

622

4,320

13,115

Short-term investments

102,300

91,715

636,776

548,061

Amounts due from related parties

5,869

40,751

29,029

11,861

82,350

55,503

Total current assets

234,522

1,628,289

1,905,647

Non-current assets:

Property and equipment, net

360,302

2,501,578

2,226,653

Intangible assets, net

80,030

555,649

810,171

Land use rights, net

10,953

76,044

64,682

165,140

1,146,570

Short-term bank borrowings

8,111

56,312

44,688

Other non-current assets

16,250

112,822

153,772

Long-term investments

38,420

266,748

164,454

Total non-current assets

679,206

4,715,723

4,610,990

Total assets

913,728

6,344,012

6,516,637

Current liabilities:

26,455

183,676

276,000

Accounts and notes payable

63,639

441,847

416,850

Accrued expenses and other payables

75,704

525,613

435,912

Advance from customers

29,007

201,397

185,800

Income tax payable

3,668

25,466

43,949

44,821

311,191

332,091

Amount due to related parties

^[1]

175,990

1,221,897

890,988

^[2]

7,676

53,295

48,762

Current portion of capital lease obligation

29,295

203,394

123,694

Current portion of long-term bank borrowings

1,810

12,564

12,422

Total current liabilities

736

5,107

6,332

458,801

3,185,447

2,772,800

Non-current liabilities:

Long-term bank borrowings

151,625

1,052,734

1,080,118

31,550

219,055

27,534

Non-current portion of capital lease obligations

83,763

581,568

543,503

Unrecognized tax benefits

3,479

24,153

11,098

Deferred tax liabilities

26,340

182,877

218,522

3,728

25,886

31,288

Mandatorily redeemable noncontrolling interests

9,006

62,531

68,535

100,000

Total non-current liabilities

309,491

2,148,804

2,080,598

Total liabilities

768,292

¥ 5,334,251

¥ 4,853,398

Net revenues

423,206

2,938,319

3,066,090

2,695,021

Net profit (loss)

(97,175)

(674,685)

(35,811)

175,521

Net cash provided by operating activities

20,361

141,364

270,358

434,865

Net cash (used in) provided by investing activities

(67,832)

(470,955)

105,635

(808,117)

Net cash provided by (used in) financing activities

25,678

178,283

(354,408)

480,045

Net increase (decrease) in cash and cash equivalents

$ (21,793)

¥ (151,308)

¥ 21,585

¥ 106,793

[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, 2016

CNY (¥)

Dec. 31, 2015

CNY (¥)

Dec. 31, 2014

CNY (¥)

Dec. 31, 2016

USD ($)

Dec. 31, 2016

CNY (¥)

Variable Interest Entity [Line Items]

Accounts receivable, allowance for doubtful accounts

¥ 39,010

$ 11,567

¥ 80,313

21Vianet China and SZ Zhuoaiyi

^[1]

890,988

175,990

1,221,897

Variable Interest Entity [Line Items]

Amount paid to inter-companies

34,603

$ 4,867

¥ 33,792

¥ 0

¥ 35,292

¥ 0

[1]

Summary of Significant Accounting Policies - Additional Information (Detail)		1 Months Ended		12 Months Ended				28 Months Ended
	Oct. 01, 2016 Segment	Sep. 30, 2016 Segment	Jun. 30, 2014	Dec. 31, 2016 USD ($) shares	Dec. 31, 2016 CNY (¥) shares	Dec. 31, 2015 CNY (¥) shares	Dec. 31, 2014 CNY (¥) shares	Dec. 31, 2016 CNY (¥) shares	Dec. 31, 2016 CNY (¥)	Dec. 30, 2016	Sep. 04, 2014 USD ($)	Aug. 26, 2014 USD ($)
Significant Accounting Policies [Line Items]
Official exchange rate of foreign currency remeasured (RMB per one U.S. dollar)										6.9430
Internal use software development costs, Amount capitalized				$ 1,841,000		¥ 23,780,000	¥ 7,199,000		¥ 12,781,000
Capitalized software costs, Amortization expense				57,000	¥ 394,000	5,772,000	8,333,000
Capitalized internal use software development costs, Unamortized amount				$ 5,762,000		27,619,000			¥ 40,006,000
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%
Discounted cash flow projection period				6 years	6 years
Impairment losses pursuant to the goodwill tests				$ 0	¥ 0	0	0
Liabilities measured at fair value on recurring basis				80,143,000		2,707,352,000			¥ 556,432,000
Vat rate			6.00%
Business tax expenses and other surcharges				0		6,394,000	25,202,000
Advertising expense				$ 2,941,000	¥ 20,420,000	¥ 26,360,000	¥ 19,687,000
Estimated forfeiture rate for management and non-management employees				1.81%	1.81%	1.10%	1.66%
Share Repurchase Plan, share value					¥ 42,665,000		¥ 213,665,000
Number of reportable segments \| Segment	2	1
American Depository Shares
Significant Accounting Policies [Line Items]
Share Repurchase Plan, shares repurchased (in shares) \| shares				815,525	815,525	0	1,553,085	2,368,610
Share Repurchase Plan, share value								¥ 256,330,000
Long-term investments
Significant Accounting Policies [Line Items]
Impairment of investment				$ 0	¥ 0	¥ 0	¥ 0
Bonds
Significant Accounting Policies [Line Items]
Liabilities measured at fair value on recurring basis				60,276,000		2,193,744,000			418,497,000
Short-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%
Option Four
Significant Accounting Policies [Line Items]
Business tax rate							5.00%
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						2,193,744,000			418,497,000
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				$ 60,276,000		¥ 2,193,744,000			¥ 418,497,000
Master Services Agreement
Significant Accounting Policies [Line Items]
Master service agreement terms				1 year	1 year
Maximum \| American Depository Shares
Significant Accounting Policies [Line Items]
Share Repurchase Plan, value \| $											$ 100,000,000	$ 5,000,000
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, 2016
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, 2016

Purchased software

3 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

7 years

9 years

^[1]

[1]	Acquired in the acquisitions of subsidiaries.

Summary of Impairment Charges Associated with Long-Lived Assets and Acquired Intangibles (Detail) - 12 months ended Dec. 31, 2016 ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
Asset Impairment Charges [Abstract]
Impairment of property and equipment	$ 34,300	¥ 238,144
Impairment of intangible assets	$ 22,296	¥ 154,803

Interest Expense (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
Interest Expense (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Supplemental Income Statement Elements [Abstract]
Interest expense and amortization cost of bonds	$ 16,328	¥ 113,367	¥ 172,677	¥ 130,355
Interest expense on bank and other borrowings	6,680	46,377	55,391	66,699
Interest expense on capital lease	9,605	66,687	57,189	40,849
Total interest costs	32,613	226,431	285,257	237,903
Less: Total interest costs capitalized	(4,010)	(27,842)	(11,073)	(5,883)
Interest expense, net	$ 28,603	¥ 198,589	¥ 274,184	¥ 232,020

Concentration of Risks - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($) Customer	Dec. 31, 2015 USD ($) Customer	Dec. 31, 2014 Customer	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Concentration Risk [Line Items]
Depreciation of RMB against US$	(6.80%)	(6.10%)	(0.40%)
Customer Concentration Risk
Concentration Risk [Line Items]
Number of customers who contributed more than 3% of Company's revenue	0	0	0
Cabinet and Bandwidth Supply \| Supplier Concentration Risk
Concentration Risk [Line Items]
Concentration of risk, percentage	19.00%	15.00%	21.00%
Bandwidth and Cabinet Resources \| Customer Concentration Risk
Concentration Risk [Line Items]
Concentration of risk, percentage	4.00%	6.00%	7.00%
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, restricted cash and short-term investments, held at major institutions	$ 70,524			¥ 489,646	¥ 969,467
Outside the PRC \| Credit Concentration Risk
Concentration Risk [Line Items]
Cash and cash equivalents, restricted cash and short-term investments, held at major institutions	$ 444,019	$ 176,637		¥ 3,082,823

Acquisitions - Additional Information (Detail)
¥ in Thousands, $ in Thousands

12 Months Ended

Jul. 07, 2016

USD ($)

Aug. 10, 2014

CNY (¥)

May 31, 2014

CNY (¥)

Dec. 31, 2016

USD ($)

Dec. 31, 2016

CNY (¥)

Dec. 31, 2015

CNY (¥)

Tranche

Dec. 31, 2014

CNY (¥)

Jul. 07, 2016

CNY (¥)

Dec. 31, 2012

CNY (¥)

Changes in the fair value of contingent purchase consideration payables

$ (13,439)

¥ (93,307)

¥ 43,325

¥ 22,629

Fair value of contingent consideration

16,350

¥ 47,755

Business acquisition, total purchase consideration

64,232

Changes in the fair value of contingent purchase consideration payables

^[1],[2],[3]

¥ 7,339

¥ 16,350

¥ 9,455

Business acquisition, equity interests acquired

50.00%

Business acquisition, acquisition date

May 31, 2014

Business acquisition, total purchase consideration

¥ 748,971

Business acquisition, equity interests share acquired | shares

Minority interest ownership percentage

50.00%

Number of tranches | Tranche

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

¥ 700,000

Aipu Group | Ceiling

Financial and operational performance targeted amount used to compute put option exercise price

¥ 800,000

Business acquisition, equity interests acquired

100.00%

Business acquisition, acquisition date

Aug. 10, 2014

Business acquisition, total purchase consideration

¥ 953,567

Dermot Entities | Restricted Stock Units (RSUs)

^[2],[4],[5]

355,067

¥ 237,874

Dynamic Ruby Limited

Business acquisition, equity interests acquired

100.00%

Total consideration

$ 10,535

¥ 73,150

Business acquisition, acquisition date

Jul. 07, 2016

[1]	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 contingent consideration related to fiscal year 2014 has been resolved and remeasured in September 2015, with its fair value of RMB4,543 reclassified to additional paid in capital. The Company subsequently issued 225,262 Shares in September 2015 for the contingent consideration related to GD Tianying's 2014 performance.
[2]	The Company determined the fair value of the contingent share consideration with the assistance of an independent third party valuation firm.
[3]	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.
[4]	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 contingent consideration related to fiscal year 2014 and 2015 has been resolved and remeasured in April 2015 and April 2016, with its fair value of RMB210,000 and RMB210,000 reclassified to additional paid in capital, respectively. The Company issued 1,923,556 ADS in April 2015 and 1,618,251 ADS in May 2016 in relation to this, respectively.
[5]	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 year 2015 has been recorded in the "Amount due to related parties" balance within the Company's consolidated balance sheets.

Fair Values of Net Identifiable Assets of FS Zhuoyi (Detail) - Jul. 07, 2016 - Dynamic Ruby Limited ¥ in Thousands, $ in Thousands	USD ($)	CNY (¥)
Business Acquisition [Line Items]
Property	$ 7,338	¥ 50,950
Cash and cash equivalents	817	5,672
Other current assets	3	21
Other current liabilities	(7,401)	(51,386)
Deferred tax liabilities	(3,566)	(24,757)
Total consideration in cash	10,535	73,150
Land Use Rights [Member]
Business Acquisition [Line Items]
Business combination, intangible assets	$ 13,344	¥ 92,650

Purchase Consideration (Detail) - CNY (¥)
¥ in Thousands

12 Months Ended

Aug. 10, 2014

May 31, 2014

Dec. 31, 2014

¥ 137,445

Total fair value of purchase price consideration

¥ 598,500

^[1]

598,500

953,567

^[2],[3],[4]

¥ 355,067

Contingent consideration in cash

^[5]

49,554

^[3],[6]

7,339

Total fair value of purchase price consideration

64,232

^[3],[6],[7]

7,339

Contingent consideration in cash

¥ 700,000

^[8]

¥ 700,000

^[9],[10]

48,971

Total fair value of purchase price consideration

¥ 748,971

[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. The contingent consideration related to fiscal year 2014 and 2015 has been resolved and remeasured in April 2015 and April 2016, with its fair value of RMB210,000 and RMB210,000 reclassified to additional paid in capital, respectively. The Company issued 1,923,556 ADS in April 2015 and 1,618,251 ADS in May 2016 in relation to this, respectively.
[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 year 2015 has been recorded in the "Amount due to related parties" balance within the Company's consolidated balance sheets.
[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.
[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. The contingent consideration related to fiscal year 2014 has been resolved and remeasured in September 2015, with its fair value of RMB4,543 reclassified to additional paid in capital. The Company subsequently issued 225,262 Shares in September 2015 for the contingent consideration related to GD Tianying's 2014 performance.
[8]	RMB700,000 of the above cash consideration was paid in 2014.
[9]	The Company determined the fair value of the contingent consideration with the assistance of an independent third party valuation firm.
[10]	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, 2015 and 2016 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). In 2016, since Aipu failed to meet the operational performance target, the contingent consideration amounted to RMB57,700 was reversed as of December 31, 2016.

Purchase Consideration (Parenthetical) (Detail) - CNY (¥)
¥ in Thousands

1 Months Ended

12 Months Ended

Aug. 10, 2014

^[1]

May 31, 2014

^[3]

May 31, 2016

Apr. 30, 2016

Apr. 30, 2015

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

¥ 137,445

¥ 598,500

598,500

Fair value of contingent consideration in shares reclassified to additional paid in capital

^[2]

49,554

¥ 4,543

Business acquisition, shares issued

225,262

Contingent consideration reversed

¥ 700,000

¥ 57,700

American Depository Shares

Business acquisition, shares issued

223,161

146,372

American Depository Shares | Dermot Entities

Fair value of contingent consideration in shares reclassified to additional paid in capital

¥ 210,000

Business acquisition, shares issued

1,618,251

1,923,556

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

Accounts and Notes Receivable and Allowance for Doubtful Debt (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Receivables [Abstract]
Accounts receivable	$ 105,884	¥ 735,154		¥ 733,558
Notes receivable	175	1,215		620
Allowance for doubtful debts	(11,653)	(80,910)	$ (5,771)	(40,070)	¥ (10,416)
Accounts and notes receivable (net of allowance for doubtful debt of RMB40,070 and RMB80,910 (US$11,653) as of December 31, 2015 and 2016, respectively)	$ 94,406	¥ 655,459		¥ 694,108

Analysis of Allowance for Doubtful Debt (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Balance at beginning of the year	$ 5,771	¥ 40,070	¥ 10,416
Provision	16,933	117,564	32,199	¥ 9,913
Write-off of accounts receivable	(5,588)	(38,797)	(1,097)
Balance at the end of the year	11,653	80,910	40,070	¥ 10,416
Allowance for Account Receivables
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision	$ 11,470	¥ 79,637	¥ 30,751

Short Term Investments (Detail) - Short-term investments ¥ in Thousands, $ in Thousands	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Investment [Line Items]
Held-to-maturity securities	$ 40,033	¥ 277,946	¥ 102,300
Fixed rate time deposits
Investment [Line Items]
Held-to-maturity securities	$ 40,033	¥ 277,946
Floating Rate Principal Unguaranteed Investments
Investment [Line Items]
Held-to-maturity securities			¥ 102,300

Short-Term Investments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Investment [Line Items]
Investments, interest income	$ 3,036,000	¥ 21,078,000	¥ 53,494,000	¥ 67,904,000
Short-term investments
Investment [Line Items]
Investments, interest income	165,000	1,148,000	37,652,000	50,882,000
Unrealized Gain (Loss) on Investments	$ 0	¥ 0	¥ 0	¥ 0

Inventories (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Inventory Disclosure [Abstract]
Broadband related products	$ 638	¥ 4,431	¥ 13,539

Prepaid Expenses and Other Current Assets (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses for bandwidth, rented data centers or cabinets	$ 23,541	¥ 163,443	¥ 126,842
Staff field advances	3,230	22,429	20,819
Interest receivables	1,955	13,576	4,936
Receivables for the disposal of certain construction-in-progress	2,922	20,290	20,290
Tax recoverables	44,567	309,426	159,413
Deposits	2,822	19,596	18,191
Loan to third parties	8,992	62,433	119,244
Other receivables	23,901	165,938	172,818
Prepaid expenses and other current assets	$ 111,930	¥ 777,131	¥ 642,553

Property and Equipment Including Those Held Under Capital Leases (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 621,910		¥ 4,317,917	¥ 3,629,622
Less: accumulated depreciation	(193,294)		(1,342,041)	(1,088,684)
Impairment	(34,300)	¥ (238,144)
Property Plant And Equipment Net Excluding Construction In Progress	394,316		2,737,732	2,540,938
Construction-in-progress	150,350		1,043,881	1,112,133
Property and Equipment, net	544,666		3,781,613	3,653,071
Property
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	70,637		490,430	439,480
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	95,931		666,051	398,473
Computer and network equipment
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	421,472		2,926,278	2,556,403
Optical Fibers
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	29,875		207,423	207,423
Office equipment
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	2,822		19,591	19,554
Motor vehicles
Property, Plant and Equipment [Line Items]
Property and Equipment, gross	$ 1,173		¥ 8,144	¥ 8,289

Property and Equipment Net - Additional Information (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 69,150	¥ 480,105	¥ 402,035	¥ 278,986
Assets held under capital leases
Property, Plant and Equipment [Line Items]
Depreciation expense	$ 14,426	¥ 100,157	¥ 64,371	¥ 22,302

Depreciation Expense (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Property, Plant and Equipment [Line Items]
Depreciation expenses	$ 69,150	¥ 480,105	¥ 402,035	¥ 278,986
Cost of Revenues
Property, Plant and Equipment [Line Items]
Depreciation expenses	57,182	397,014	328,217	225,680
Selling and Marketing Expense
Property, Plant and Equipment [Line Items]
Depreciation expenses	541	3,759	5,670	3,397
General and Administrative Expense
Property, Plant and Equipment [Line Items]
Depreciation expenses	6,590	45,746	29,753	19,433
Research and Development Expense
Property, Plant and Equipment [Line Items]
Depreciation expenses	$ 4,837	¥ 33,586	¥ 38,395	¥ 30,476

Carrying Amounts of Property and Equipment Held Under Capital Leases (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Capital Leased Assets [Line Items]
Property and Equipment Held Under Capital Leases, gross	$ 144,710	¥ 1,004,724	¥ 862,122
Less: accumulated depreciation	(34,389)	(238,765)	(138,608)
Property and Equipment Held Under Capital Leases, gross	110,321	765,959	723,514
Construction-in-progress	150,350	1,043,881	1,112,133
Property and Equipment Held Under Capital Leases, net	115,493	801,865	866,185
Property
Capital Leased Assets [Line Items]
Property and Equipment Held Under Capital Leases, gross	52,622	365,353	365,353
Computer and network equipment
Capital Leased Assets [Line Items]
Property and Equipment Held Under Capital Leases, gross	62,213	431,948	289,346
Optical Fibers
Capital Leased Assets [Line Items]
Property and Equipment Held Under Capital Leases, gross	29,875	207,423	207,423
Capital Lease
Capital Leased Assets [Line Items]
Construction-in-progress	$ 5,172	¥ 35,906	¥ 142,671

Carrying Amounts of Property, Computer, Network Equipment and Construction-in-Progress Pledged to Secure Banking Borrowings (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	$ 48,321	¥ 335,491
Property
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	1,143	7,938	¥ 22,118
Computer and network equipment
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	4,538	31,506	¥ 37,167
Construction in Progress
Property, Plant and Equipment [Line Items]
Assets pledged as collateral	$ 45,839	¥ 318,259

Summary of Intangible Assets (Detail)
¥ in Thousands, $ in Thousands

12 Months Ended

Dec. 31, 2016

USD ($)

Dec. 31, 2016

CNY (¥)

Dec. 31, 2015

CNY (¥)

Dec. 31, 2014

CNY (¥)

Foreign currency translation difference

¥ 1,274,166

¥ 1,404,453

Additions

39,544

46,486

Disposals

(6,531)

(243)

8,929

7,617

$ (26,496)

(183,964)

(184,147)

¥ (127,669)

(22,296)

(154,803)

140,766

977,341

1,274,166

1,404,453

Purchased software

Foreign currency translation difference

74,471

67,032

Additions

26,763

22,706

Disposals

(6,531)

1,814

380

(23,072)

(15,647)

10,578

73,445

74,471

67,032

Radio Spectrum License

Foreign currency translation difference

93,387

95,880

7,115

7,237

(8,934)

(9,730)

13,189

91,568

93,387

95,880

Network Use Right

16,834

17,834

(1,000)

2,281

15,834

16,834

17,834

Contract Backlog

^[1]

24,926

31,514

^[1]

(6,588)

^[1]

2,641

18,338

24,926

31,514

Customer Relationships

^[1]

595,648

677,431

^[1]

(80,349)

(81,783)

^[1]

(102,524)

^[1]

59,452

412,775

595,648

677,431

Licenses

^[1]

16,519

17,785

^[1]

(1,266)

^[1]

(2,696)

^[1]

1,809

12,557

16,519

17,785

Supplier Relationships

^[1]

115,727

141,004

^[1]

(25,277)

^[1]

(2,007)

^[1]

12,738

88,443

115,727

141,004

Trade Names

^[1]

211,189

229,097

^[1]

(17,908)

^[1]

(24,896)

^[1]

24,252

168,385

211,189

229,097

Platform Software

^[1]

7,753

11,582

^[1]

(3,829)

^[1]

565

3,924

7,753

11,582

Non - Complete Agreement

^[1]

18,504

24,198

^[1]

(5,694)

^[1]

(3,907)

^[1]

1,282

8,903

18,504

24,198

Internal Use Software

27,619

9,854

Additions

12,781

23,780

Disposals

(243)

(394)

(5,772)

Property management relationship

5,762

40,006

27,619

9,854

^[1]

71,589

81,242

^[1]

(9,653)

^[1]

(18,773)