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Principal accounting policies (Convenience Translation - Narrative) (Details) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 CNY (¥)
Convenience translation |  |  |
Rate of translations of amounts from RMB into US$ | 6.4778 |  |
Impairment of long-lived assets |  |  |
Impairment charges of intangible assets | ¥ 57,199 | ¥ 5,697 |

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- Definition 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 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521 + Details
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