XML 149 R130.htm IDEA: XBRL DOCUMENT v3.8.0.1

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

X

- References

No definition available.

+ Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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