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Summary of significant accounting policies (Details 2) (CNY) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Goodwill
Impairment loss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss	0us-gaap_GoodwillImpairmentLoss
Impairment of long-lived assets
Impairment loss	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse	0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Domain name
Intangible assets, net
Estimated useful lives	10 years
Copyrights | Minimum
Intangible assets, net
Estimated useful lives	2 years
Copyrights | Maximum
Intangible assets, net
Estimated useful lives	5 years
Land use rights
Intangible assets, net
Estimated useful lives	50 years

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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