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Fair value measurements (Summary of Liabilities Measured at Fair Value on Recurring Basis) (Details) - Recurring [Member] - CNY (¥) ¥ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Liabilities |  |
Contingent consideration in relation to a business acquisition |  | ¥ 183,000
Level 1 [Member] |  |
Liabilities |  |
Contingent consideration in relation to a business acquisition |  |
Level 2 [Member] |  |
Liabilities |  |
Contingent consideration in relation to a business acquisition |  |
Level 3 [Member] |  |
Liabilities |  |
Contingent consideration in relation to a business acquisition |  | ¥ 183,000

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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=6911338&loc=d3e6819-128478 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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