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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Parenthetical) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 CNY (¥)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)	Nov. 21, 2012
Share-based compensation	¥ 157,286	$ 22,654	¥ 185,372	¥ 134,632
Cost of revenues [Member]
Share-based compensation	15,894	2,289	23,963	18,037
Research and development expenses [Member]
Share-based compensation	78,816	11,352	70,951	54,141
Sales and marketing expenses [Member]
Share-based compensation	3,107	448	3,283	2,807
General and administrative expenses [Member]
Share-based compensation	¥ 59,469	$ 8,565	¥ 87,175	¥ 59,647
Class A common shares [Member]
Number of common shares represented by each ADS	20	20	20	20	20

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- Definition

The number of underlying shares represented by one American Depository Receipt (ADR) or Global Depository Receipt (GDR). A value of "3" means that one ADR represents 3 underlying shares. If one underlying share represents 2 ADR's then the value would be represented as "0.5".

+ References

No definition available.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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