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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%

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
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 6.I)
-URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319

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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
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331

Reference 3: http://www.xbrl.org/2003/role/presentationRef
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-Section 25
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-URI http://asc.fasb.org/extlink&oid=51675352&loc=d3e28200-109314

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- Definition

Amount of deferred tax liability accrual attributable to taxable temporary differences from the Chinese dividend withholding taxes.

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- Definition

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.

+ References

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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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No definition available.

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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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- Definition

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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- Definition

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

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- Definition

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

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No definition available.

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- Definition

Schedule Of Income Tax.

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- Definition

Represents the amount of withholding income taxes.

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No definition available.

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- Definition

Represents the percentage of withholding income tax rate.

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