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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

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