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Share-based payments - Non-vested shares (Details) ¥ / shares in Units, ¥ in Thousands	12 Months Ended
	Dec. 31, 2018 CNY (¥) $ / shares	Dec. 31, 2018 CNY (¥) ¥ / shares shares	Dec. 31, 2017 CNY (¥) $ / shares	Dec. 31, 2017 CNY (¥) ¥ / shares shares	Dec. 31, 2016 $ / shares	Dec. 31, 2016 CNY (¥) ¥ / shares shares
Share-based Payments
Number of options				1,320,000
Share based payment expenses recognized | ¥		¥ 671,210		¥ 667,098		¥ 475,653
Employees
Share-based Payments
Share based payment expenses recognized | ¥		¥ 65,884		¥ 54,505		¥ 7,002
Restricted shares
Share-based Payments
Non-vested ordinary shares granted to executive officers, employees, members of Audit Committee and consultants (in shares)		1,102,576		2,900,580		1,815,919
Non-vested shares movement
Outstanding at the beginning of the period		3,930,258		2,419,865		2,094,709
Granted		1,102,576		2,900,580		1,815,919
Vested		(1,322,560)		(925,623)		(1,119,032)
Forfeited		(786,772)		(464,564)		(371,731)
Outstanding at the end of the period		2,923,502		3,930,258		2,419,865
Restricted shares | Employees
Share-based Payments
Share based payment expenses recognized | ¥		¥ 605,326		¥ 612,593		¥ 468,651
2012 Stock Incentive Plan | Restricted shares
Share-based Payments
Non-vested ordinary shares granted to executive officers, employees, members of Audit Committee and consultants (in shares)		1,102,576		2,900,580		1,815,919
Vesting period		4 years
Vesting percentage on first anniversary from grant date		25.00%
Percentage of awards vesting on a monthly basis, ending on the fourth anniversary of the grant date		75.00%
Period over which remaining three-fourth shares will vest on a monthly basis		3 years
Aggregate fair value of the restricted shares at grant dates | ¥		¥ 527,552		¥ 1,082,797		¥ 824,474
Unrecognized compensation cost related to non-vested shares | ¥	¥ 1,202,977	¥ 1,202,977	¥ 1,432,463	¥ 1,432,463
Weighted-average vesting period over which unrecognized compensation cost is to be recognized		2 years 3 months 26 days
Weighted average granted fair value per share of non-vested shares granted during the year (in dollars per share) | (per share)	¥ 65.59	¥ 478.47	¥ 55.51	¥ 361.18	$ 67.66	¥ 469.76
Non-vested shares movement
Granted		1,102,576		2,900,580		1,815,919
2012 Stock Incentive Plan | Restricted shares | Key management
Share-based Payments
Forfeiture rate (as a percent)		0.00%		0.00%		0.00%
2012 Stock Incentive Plan | Restricted shares | Employees
Share-based Payments
Forfeiture rate (as a percent)		22.00%		18.00%		13.00%

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.

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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.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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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).

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The weighted average fair value at grant date for nonvested equity-based awards issued 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).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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

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Represents the percentage of grants made during the period on other than stock (or unit) option plans which is vesting on monthly basis, ending on the fourth anniversary of the grant date.

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Represents the percentage of vesting on first anniversary from grant date of grants made during the period on other than stock (or unit) option plans.

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Represents the total fair value of equity-based awards for which the grantee has not gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Represents the period over which grants made on other than stock (or unit) option plans will vest on a monthly basis.

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Represents the forfeiture rate estimated by the entity in determining the fair value of the share options.

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