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Share based compensation (Restricted Share Units - Narrative) (Details) - 2011 Incentive Scheme [Member] - CNY (¥) ¥ in Thousands		1 Months Ended	12 Months Ended				15 Months Ended
	Sep. 16, 2011	Oct. 31, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2012
Share-based compensation [Line Items]
Shares approved for grants to qualified persons	43,000,000
Annual increase on the first day of each fiscal year, beginning from 2013 in maximum aggregate number of shares which may be issued pursuant to all awards under the Plan		20,000,000
Restricted share units [Member]
Share-based compensation [Line Items]
Granted (in shares)			16,012,644	9,912,595	29,965,989
Share-based compensation (benefit)			¥ 152,205	¥ 130,718	¥ 95,792
Total unrecognized compensation expense			¥ 294,041
Weighted average period over which unrecognized compensation expense is expected to be recognized			1 year 1 month 28 days
Restricted share units [Member] | Employees [Member]
Share-based compensation [Line Items]
Granted (in shares)	9,097,000		16,012,644	9,912,595	29,917,989	18,295,221
Restricted share units [Member] | Employees [Member] | Minimum [Member]
Share-based compensation [Line Items]
Vesting period	4 years		3 years	18 months		2 years
Restricted share units [Member] | Employees [Member] | Maximum [Member]
Share-based compensation [Line Items]
Vesting period	5 years		5 years	5 years		4 years
Restricted share units [Member] | Non-employee [Member]
Share-based compensation [Line Items]
Granted (in shares)			0	0	48,000		0
Restricted share units [Member] | Employees and Non Employees [Member] | Minimum [Member]
Share-based compensation [Line Items]
Vesting period					3 years
Restricted share units [Member] | Employees and Non Employees [Member] | Maximum [Member]
Share-based compensation [Line Items]
Vesting period					5 years

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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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.

+ References

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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The annual increase on the first day of each fiscal year in maximum aggregate number of shares which may be issued pursuant to all awards under the Plan.

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