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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, 2016
Dec. 31, 2015
Investments:    
Available-for-sale securities ¥ 188,597 ¥ 6,117
Level 1 [Member]    
Investments:    
Available-for-sale securities 182,480
Level 2 [Member]    
Investments:    
Available-for-sale securities
Level 3 [Member]    
Investments:    
Available-for-sale securities ¥ 6,117 ¥ 6,117