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Summary of Company Subsidiaries and Its Consolidated Variable Interest Entities (Detail)
 12 Months Ended
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".