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Principal accounting policies (Convenience Translation - Narrative) (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Convenience translation
Rate of translations of amounts from RMB into US$	6.9430
Impairment of long-lived assets
Impairment charges of intangible assets	¥ 3,828	¥ 57,199	¥ 5,697
Accounting Standards Update 2015-17 [Member]
Impairment of long-lived assets
Reclassification Of Current Deferred Tax Assets To Non Current Assets	¥ 107,309	¥ 116,921
Use Rights [Member]
Impairment of long-lived assets
Useful life of intangible assets	40 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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Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
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-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275

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Amount of current deferred tax assets which is reclassified into non current assets.

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