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Property and equipment, net (Schedule of Property and Equipment) (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2015 USD ($)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Property and equipment, net [Line Items]
Gross carrying amount		¥ 1,112,767	¥ 392,989
Less: accumulated depreciation		(269,318)	(158,761)
Property and equipment, net	$ 130,206	843,449	¥ 234,228
Building [Member]
Property and equipment, net [Line Items]
Gross carrying amount		482,387
Servers, computers and equipment [Member]
Property and equipment, net [Line Items]
Gross carrying amount		453,441	¥ 304,117
Leasehold improvements [Member]
Property and equipment, net [Line Items]
Gross carrying amount		69,929	¥ 32,392
Decoration of buildings [Member]
Property and equipment, net [Line Items]
Gross carrying amount		66,140
Furniture, fixture and office equipment [Member]
Property and equipment, net [Line Items]
Gross carrying amount		26,098	¥ 13,879
Motor vehicles [Member]
Property and equipment, net [Line Items]
Gross carrying amount		12,835	10,815
Construction in progress [Member]
Property and equipment, net [Line Items]
Gross carrying amount		¥ 1,937	¥ 31,786

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Section S99
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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 13
-Subparagraph a
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