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

X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Schedule of Capital Lease Obligations [Line Items]

+ References

No definition available.

+ Details

Name:	vnet_ScheduleOfCapitalLeaseObligationsLineItems
Namespace Prefix:	vnet_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_CapitalLeaseObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: