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Income tax (Narrative) (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended | 48 Months Ended | 96 Months Ended
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2015 | 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
Cayman [Member] |  |  |  |  |
Income tax [Line Items] |  |  |  |  |
Withholding income tax | 0 |  |  | 0 | 0
BVI [Member] |  |  |  |  |
Income tax [Line Items] |  |  |  |  |
Withholding income tax | ¥ 0 |  |  | 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%
Preferential tax rate (as a percent) | 15.00% |  |  |  |
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 | ¥ 3,090,721 | ¥ 1,819,004 |  | ¥ 3,090,721 | ¥ 3,090,721
Maximum period for claw back underpaid tax plus penalties and interest by tax authorities | 5 years |  |  |  |
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) | 0.00% |  |  |  |

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- Definition Amount of undistributed earnings of domestic subsidiaries or domestic joint ventures intended to be permanent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(c) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28200-109314 + Details
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