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SHARE-BASED COMPENSATION - OTHER SHARE INCENTIVE AWARDS (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2015 CNY (¥) shares	Dec. 31, 2014 CNY (¥)	Dec. 31, 2013 CNY (¥)	Dec. 31, 2015 CNY (¥) shares
Other disclosures
Share-based compensation expenses	$ 48,690	¥ 315,407	¥ 173,274	¥ 37,396
Other Share Incentive Awards
Other disclosures
Share-based compensation expenses	3,848	24,926	¥ 0	0
Unrecognized compensation costs	4,013				¥ 25,993
Expected period over which unamortized compensation costs is to be recognized			1 year 6 months 26 days
Total fair value of vested shares	$ 1,891	¥ 12,247	¥ 0	¥ 0
Other Share Incentive Awards | Restricted shares
Number of ordinary shares
Number of restricted shares granted | shares	4,627,940	4,627,940
Vested | shares	(926,023)	(926,023)
Forfeited | shares	(11,250)	(11,250)
Unvested at end of year | shares	3,690,667				3,690,667
Weighted average grant date fair value
Granted (in dollars per share) | $ / shares	$ 2.26
Vested (in dollars per share) | $ / shares	2.17
Forfeited (in dollars per share) | $ / shares	2.58
Unvested at end of year (in dollars per share) | $ / shares	$ 2.28

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- 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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Unrecognized cost of unvested share-based compensation awards.

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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