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SHARE-BASED COMPENSATION - EXPENSES RECORDED BY GROUP (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2013 CNY (¥)
SHARE-BASED COMPENSATION
Share-based compensation expenses	$ 48,690	¥ 315,407	¥ 173,274	¥ 37,396
Kingsoft Share Award Scheme
SHARE-BASED COMPENSATION
Share-based compensation expenses	853	5,525	5,616	1,869
Cost of revenues
SHARE-BASED COMPENSATION
Share-based compensation expenses	235	1,523	1,393	10
Product development expenses
SHARE-BASED COMPENSATION
Share-based compensation expenses	22,026	142,682	51,176	14,520
Selling and marketing
SHARE-BASED COMPENSATION
Share-based compensation expenses	2,789	18,068	7,407	2,835
General and administrative
SHARE-BASED COMPENSATION
Share-based compensation expenses	$ 23,640	¥ 153,134	¥ 113,298	¥ 20,031

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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