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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%

X

- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of undistributed earnings of domestic subsidiaries or domestic joint ventures intended to be permanent.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of deferred tax liability accrual attributable to taxable temporary differences from the Chinese dividend withholding taxes.

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For enterprises engage in research and development activities, the percentage of research and development expenses entitled to be claimed, as tax deductible expenses in determining the entity's tax assessable profits.

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- Definition

Represents the period after the first profitable year during which the entity is exempted from tax.

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- Definition

Represents the percentage by which the tax rate is reduced for the three year period following the initial exemption period.

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Represents the period during which the entity is entitled for a specified percentage reduction in tax following the initial exemption period from the first profitable year.

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Maximum Period for Claw Back Underpaid Tax plus Penalties and Interest by Tax Authorities.

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Represents the preferential tax rate applicable to the entity under the preferential tax treatment.

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Amount of current deferred tax assets which is reclassified into non current assets.

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Schedule Of Income Tax.

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- Definition

Represents the amount of withholding income taxes.

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- Definition

Represents the percentage of withholding income tax rate.

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