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Income tax (Narrative) (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended | 36 Months Ended | 96 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Income tax [Line Items] |  |  |  |  |
Income tax rate (as a percent) | 25.00% | 25.00% | 25.00% |  |
Accrued deferred tax liability | ¥ 0 | ¥ 0 |  | ¥ 0 | ¥ 0
Operating Loss Carryforwards | 295,238 |  |  | 295,238 |
Accounting Standards Update 2015-17 [Member] |  |  |  |  |
Income tax [Line Items] |  |  |  |  |
Reclassification Of Current Deferred Tax Assets To Non Current Assets | 107,309 | ¥ 116,921 |  | 107,309 | ¥ 116,921
Cayman [Member] |  |  |  |  |
Income tax [Line Items] |  |  |  |  |
Withholding Income Tax | 0 |  |  | 0 |
BVI [Member] |  |  |  |  |
Income tax [Line Items] |  |  |  |  |
Withholding Income Tax | ¥ 0 |  |  | 0 |
Hong Kong [Member] |  |  |  |  |
Income tax [Line Items] |  |  |  |  |
Income tax rate (as a percent) | 16.50% | 16.50% | 16.50% |  |
PRC [Member] |  |  |  |  |
Income tax [Line Items] |  |  |  |  |
Income tax rate (as a percent) | 25.00% |  |  |  | 25.00%
Tax exemption period following the first profitable year | 2 years |  |  |  |
Period for reduction in tax percentage | 3 years |  |  |  |
Reduction in tax rate for three years following the exemption period (as a percent) | 50.00% |  |  |  |
Percentage of research and development expenses entitled to claim by enterprise | 150.00% |  |  |  |
PRC withholding tax rate (as a percent) | 10.00% |  |  |  |
Aggregate undistributed earnings of subsidiaries available for distribution | ¥ 4,784,432 | ¥ 3,090,721 |  | ¥ 4,784,432 | ¥ 3,090,721
Maximum period for claw back underpaid tax plus penalties and interest by tax authorities | 5 years |  |  |  |
Guangzhou Huaduo [Member] |  |  |  |  |
Income tax [Line Items] |  |  |  |  |
Preferential tax rate (as a percent) |  |  |  | 15.00% |
Guangzhou Huaduo [Member] | PRC [Member] |  |  |  |  |
Income tax [Line Items] |  |  |  |  |
Preferential tax rate (as a percent) | 15.00% |  |  |  |
Guangzhou Huanju Shidai [Member] |  |  |  |  |
Income tax [Line Items] |  |  |  |  |
Preferential tax rate (as a percent) | 12.50% |  |  |  |

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