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Loss Per Share - Additional Information (Detail) - shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Earnings Per Share [Abstract] |  |  |
Shares issued to depository bank (in shares) | 9,000,000 | 4,500,000 | 7,200,000

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- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Depositary Shares Issued + References No definition available. + Details
Name: | vnet_DepositarySharesIssued
Namespace Prefix: | vnet_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration