Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Gross number of share options (or share units) granted during the period.

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Percentage of vesting of share-based compensation awards.

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Number of individuals to whom awards were granted under the equity-based compensation plan.

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Number of equal installments in which awards granted under the equity-based compensation plan will vest over the specified period.

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Share based compensation (Share Options - Narrative) (Details) ¥ in Thousands			1 Months Ended	12 Months Ended
	Dec. 31, 2008 shares	Dec. 31, 2007 shares	Dec. 31, 2015	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)
Share-based Compensation Award, Tranche Two [Member]
Share-based compensation [Line Items]
Number of equal installments in which award will vest				2
Share options [Member] \| Pre-2009 Scheme Options [Member]
Share-based compensation [Line Items]
Vesting period				4 years
Total intrinsic value of options exercised \| ¥				¥ 3,270	¥ 122,956	¥ 134,844
Share options [Member] \| Pre-2009 Scheme Options [Member] \| Share-based Compensation Award, Tranche One [Member]
Share-based compensation [Line Items]
Vesting rate			25.00%
Share options [Member] \| Pre-2009 Scheme Options [Member] \| Share-based Compensation Award, Tranche Two [Member]
Share-based compensation [Line Items]
Vesting period				36 months
Vesting rate				75.00%
Number of equal installments in which award will vest				6
Share options [Member] \| Pre-2009 Scheme Options [Member] \| Employees [Member]
Share-based compensation [Line Items]
Awards granted (in shares)	8,499,050	12,705,700
Share options [Member] \| Pre-2009 Scheme Options [Member] \| Non-employee [Member]
Share-based compensation [Line Items]
Awards granted (in shares)		3,832,290
Number of non-employees to whom options were granted		1