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Capital Leases - Additional Information (Detail) | Dec. 31, 2017 | Dec. 31, 2016
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Capital Leases |  |
Schedule of Capital Lease Obligations [Line Items] |  |
Weighted average interest rate | 9.93% | 9.76%

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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Schedule of Capital Lease Obligations [Line Items] + References No definition available. + Details
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Namespace Prefix: | vnet_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |