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Summary of Company Subsidiaries and Its Consolidated Variable Interest Entities (Detail) | 12 Months Ended
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Dec. 31, 2017
21ViaNet Group Limited ("21Vianet HK") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | May 25, 2007 |
Place of incorporation | Hong Kong |
Percentage of direct ownership by the Company | 100.00% |
Principal activities | Investment holding |
21Vianet Data Center Co., Ltd. ("21Vianet China") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Jun. 12, 2000 | [1]
Place of incorporation | PRC | [1]
Percentage of direct ownership by the Company | 100.00% | [1]
Principal activities | Provision of technical and consultation services and rental of long-lived assets | [1]
21Vianet (Foshan) Technology Co., Ltd. ("FS Technology") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Dec. 20, 2011 | [1]
Place of incorporation | PRC | [1]
Percentage of direct ownership by the Company | 100.00% | [1]
Principal activities | Trading of network equipment, provision of technical and internet data center services | [1]
21Vianet Anhui Suzhou Technology Co., Ltd.("SZ Technology") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Nov. 16, 2011 | [1]
Place of incorporation | PRC | [1]
Percentage of direct ownership by the Company | 100.00% | [1]
Principal activities | Trading of network equipment | [1]
21Vianet Hangzhou Information Technology Co.,Ltd. ("HZ Technology") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Mar. 04, 2013 | [1]
Place of incorporation | PRC | [1]
Percentage of direct ownership by the Company | 100.00% | [1]
Principal activities | Provision of internet data center services | [1]
21Vianet Mobile Limited ("21V Mobile") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Apr. 30, 2013 |
Place of incorporation | Hong Kong |
Percentage of direct ownership by the Company | 100.00% |
Principal activities | Investment holding and provision of telecommunication services |
Joytone Infotech Co., Ltd. ("SZ Zhuoaiyi") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Apr. 30, 2013 | [1]
Place of incorporation | PRC | [1]
Percentage of direct ownership by the Company | 100.00% | [1]
Principal activities | Provision of technical and consultation services | [1]
21Vianet Ventures Limited (Ventures) | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Mar. 06, 2014 |
Place of incorporation | Hong Kong |
Percentage of direct ownership by the Company | 100.00% |
Principal activities | Investment holding |
Abitcool (China) Broadband Inc. ("aBitCool DG") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Jun. 13, 2014 | [1]
Place of incorporation | PRC | [1]
Percentage of direct ownership by the Company | 100.00% | [1]
Principal activities | Dormant company | [1]
Diyixian.com Limited ("Diyixian.com") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Aug. 10, 2014 |
Place of incorporation | Hong Kong |
Percentage of direct ownership by the Company | 100.00% |
Principal activities | Provision of virtual private network services |
21Vianet Zhuhai Financial Leasing Limited | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Apr. 09, 2015 |
Place of incorporation | PRC |
Percentage of direct ownership by the Company | 100.00% |
Principal activities | Provision of financial leasing business services |
21Vianet DRP Investment Holdings Limited [Member] | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Jan. 10, 2017 |
Place of incorporation | Hong Kong |
Percentage of direct ownership by the Company | 100.00% |
Principal activities | Investment holding |
Shihua DC Investment Holdings Limited. | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Mar. 14, 2017 |
Place of incorporation | Cayman |
Percentage of direct ownership by the Company | 51.00% |
Principal activities | Investment holding |
21Vianet (Xi'an) Technology Co., Ltd. ("Xi'an Tech") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Jul. 05, 2012 | [1]
Place of incorporation | PRC | [1]
Percentage of direct ownership by the Company | 51.00% | [1]
Principal activities | Provision of technical and internet data center services | [1]
Foshan Zhuoyi Intelligence Date Co., Ltd. ("FS Zhuoyi") | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Jul. 07, 2016 | [1],[2]
Place of incorporation | PRC | [1],[2]
Percentage of direct ownership by the Company | 51.00% | [1],[2]
Principal activities | Dormant company | [1],[2]
Dermot Holding Limited [Member] | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Aug. 08, 2018 | [3]
Place of incorporation | British Virgin Islands | [3]
Percentage of direct ownership by the Company | 100.00% | [3]
Principal activities | Investment holding | [3]
Beijing Yiyun Network Technology Co., Ltd. (formerly known as [Beijing aBitCool Network Technology Co., Ltd.]) ("21Vianet Technology") | Variable Interest Entities |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Oct. 22, 2022 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Provision of internet data center services | [1],[4]
Beijing iJoy Information Technology Co., Ltd. ("BJ iJoy") | Variable Interest Entities |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Apr. 30, 2013 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Provision of internet data center, content delivery network services | [1],[4]
WiFire Network Technology (Beijing) Co., Ltd. (formerly known as aBitCool Small Micro Network Technology (BJ) Co., Ltd.) (WiFire Network) | Variable Interest Entities |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Apr. 01, 2014 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Provision of telecommunication services | [1],[4]
Shanghai iJoy Information Technology Co., Ltd. ("SH iJoy") | Variable Interest Entities | Held directly by BJ iJoy |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | May 30, 2013 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Provision of internet data center, content delivery network services | [1],[4]
Beijing 21ViaNet Broadband Data Center Co., Ltd ("21Vianet Beijing") | Variable Interest Entities | Held Directly by 21 Vianet Technology |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Mar. 15, 2006 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Provision of internet data center services | [1],[4]
21Vianet (Xi'an) Information Outsourcing Industry Park Services Co., Ltd. ("Xi'an Sub") | Variable Interest Entities | Held Directly by 21 Vianet Beijing |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Jun. 23, 2008 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Provision of internet data center services | [1],[4]
Langfang Xunchi Computer Data Processing Co., Ltd. ("LF Xunchi") | Variable Interest Entities | Held Directly by 21 Vianet Beijing |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Dec. 19, 2011 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Dormant company | [1],[4]
Shanghai Blue Cloud Technology Co., Ltd. ("SH Blue Cloud") | Variable Interest Entities | Held Directly by 21 Vianet Beijing |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Mar. 21, 2013 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Provision of Office 365 and Windows Azure platform services | [1],[4]
Beijing Yilong Xinda Technology Co., Ltd. ("BJ Yilong") | Variable Interest Entities | Held Directly by 21 Vianet Beijing |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Feb. 28, 2013 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Provision of managed network services and virtual private network services | [1],[4]
Beijing Yichengtaihe Investment Co., Ltd | Variable Interest Entities | Held Directly by 21 Vianet Beijing |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Sep. 30, 2014 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Provision of internet data center services | [1],[4]
Beijing Hongyuan Network Technology Co., Ltd [Member] | Variable Interest Entities | Held Directly by 21 Vianet Beijing | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Dec. 08, 2014 | [1],[4]
Place of incorporation | PRC | [1],[4]
Percentage of direct ownership by the Company | 0.00% | [1],[4]
Principal activities | Provision of internet data center services | [1],[4]
Shenzhen Diyixian Telecommunication Co., Ltd [Member] | Variable Interest Entities | Held Directly by 21 Vianet Beijing | Subsidiaries |  |
Business Acquisition [Line Items] |  |
Date of incorporation/ Acquisition | Aug. 10, 2014 | [1]
Place of incorporation | PRC | [1]
Percentage of direct ownership by the Company | 100.00% | [1]
Principal activities | Provision of virtual private network services | [1]
[1] | Collectively, the "PRC Subsidiaries".
[2] | 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").
[3] | 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.
[4] | Collectively, the "Consolidated VIEs".

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