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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (Parenthetical) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2013 CNY (¥)	Nov. 21, 2012
CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME [Abstract]
Foreign currency translation adjustments, tax portion
Share-based compensation	$ 28,617	¥ 185,372	¥ 134,632	¥ 117,096
Cost of revenues [Member]
Share-based compensation	3,699	23,963	18,037	9,860
Research and development expenses [Member]
Share-based compensation	10,953	70,951	54,141	39,587
Sales and marketing expenses [Member]
Share-based compensation	507	3,283	2,807	1,318
General and administrative expenses [Member]
Share-based compensation	$ 13,458	¥ 87,175	¥ 59,647	¥ 66,331
Class A common shares [Member]
Number of common shares represented by each ADS	20	20			20

X

- 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".

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature, attributable to parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 19
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569616-111683

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=51664549&loc=SL4569643-111683

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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=56944662&loc=d3e3602-108585

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