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INVESTMENTS - Qunar (Details)		3 Months Ended	12 Months Ended
	Dec. 10, 2015 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)
Equity method investment disclosures
Share of cumulative loss			$ (10,008,156)	¥ (65,116,066)	¥ 601,883,179	¥ (135,780,312)
Qunar
Equity method investment disclosures
Share of cumulative loss		¥ (2,400,000,000)
Gain from the re-measurement of the previously held equity interest to the fair value in the business acquisition	¥ 2,400,000,000

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In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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