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INVESTMENTS (Details 5)
¥ in Millions, $ in Millions
1 Months Ended 12 Months Ended
May. 31, 2015
USD ($)
Dec. 31, 2012
CNY (¥)
Sep. 30, 2015
director
Dec. 31, 2014
shares
Oct. 02, 2011
Sep. 30, 2011
eLong            
Equity method investment disclosures            
Equity method investment, ownership interest (as a percent) 37.60%          
Total consideration of acquisition | $ $ 414          
Number Of Seats Allocated     1      
Number Of Board Of Directors Seats     8      
Home Inns            
Equity method investment disclosures            
Equity method investment, ownership interest (as a percent)       15.10%   17.50%
Number of shares held | shares       14,400,765    
Noncash gain due to remeasurement of equity interest based on issuance of shares | ¥   ¥ 39.3        
Home Inns | Business Acquired by Home Inns            
Equity method investment disclosures            
Percentage of equity interest Home Inns acquired in a business         100.00%