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PRINCIPAL ACCOUNTING POLICIES (Details 7)	9 Months Ended			12 Months Ended			21 Months Ended
	Sep. 30, 2015 USD ($) item	Sep. 30, 2015 CNY (¥) item	Sep. 30, 2014 CNY (¥)	Dec. 31, 2014 CNY (¥) item	Dec. 31, 2013 CNY (¥)	Dec. 31, 2012 CNY (¥)	Sep. 30, 2015 CNY (¥)	Sep. 30, 2015 CNY (¥)
PRINCIPAL ACCOUNTING POLICIES
Number of business acquisitions or investments material to businesses or financial results of the entity | item				0
Impairment of goodwill				¥ 0	¥ 0	¥ 0
Number Of Impairment Triggering Events Identified In The Period | item	0	0
Impairment on other intangible assets							¥ 0
Impairment of long-lived assets		¥ 0	¥ 0
Accrued liability for customer reward program
Amount of accrued liability for group's customers reward program	$ 90,537,527			¥ 430,852,908				¥ 575,420,307
Amount of expenses for group's customers reward program		328,000,000	274,000,000
Allowance for doubtful accounts activity
Provision for doubtful accounts	$ 3,760,875	23,902,615	2,474,801
Sales and marketing
Advertising expenses		¥ 1,300,000,000	¥ 775,000,000
Minimum
Intangible assets
Intangible asset useful life	3 years	3 years
Maximum
Intangible assets
Intangible asset useful life	10 years	10 years

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Value of deferred revenue or cost to provide products or services, which is expected to be recognized in income or incurred within one year or the normal operating cycle, if longer, resulting from customer loyalty program. Excludes liability associated with frequent flier programs. Includes liability associated with customer loyalty programs for other businesses, for example, but is not limited to, hotels, supermarkets, credit card companies, automobile rental companies, and book sellers.

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