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SHORT-TERM DEBT (Details)
9 Months Ended
Sep. 30, 2015
USD ($)
item
Sep. 30, 2015
CNY (¥)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
CNY (¥)
Short-term borrowings        
Total $ 915,630,000 ¥ 5,819,378,028   ¥ 3,560,488,641
Restricted cash 169,353,890 1,076,345,583   836,394,951
Short-term Investments 1,137,834,875 7,231,623,333   6,438,854,587
2017 Convertible Senior Notes        
Short-term borrowings        
Long-term debt, current maturities $ 65,000,000 411,525,100   428,427,630
Pledged borrowings by bank deposits        
Short-term borrowings        
Short- term borrowings | $     $ 266,300,000  
Loan facility        
Short-term borrowings        
Short- term borrowings | ¥   5,407,852,928   ¥ 3,132,061,011
Borrowing with an interest rate of 1.5%        
Short-term borrowings        
Number of borrowings 6      
Short- term borrowings $ 266,300,000 1,700,000,000    
Restricted cash | ¥   120,000,000    
Short-term Investments | ¥   ¥ 1,200,000,000    
Number of subsidiaries 1      
Interest rate (as a percent) 1.50% 1.50%    
Borrowing with an interest rate of 1.3% to 2.3%        
Short-term borrowings        
Number of borrowings 3      
Short- term borrowings $ 197,900,000 ¥ 1,300,000,000    
Restricted cash | $ 380,000,000      
Short-term Investments | $ $ 2,100,000,000      
Number of subsidiaries 1      
Borrowing with an interest rate of 2.0%        
Short-term borrowings        
Number of borrowings 1      
Short- term borrowings $ 58,800,000 373,700,000    
Short-term Investments | ¥   ¥ 75,000,000    
Number of subsidiaries 1      
Interest rate (as a percent) 2.00% 2.00%    
Borrowing with an interest rate of 1.6%        
Short-term borrowings        
Number of borrowings 3      
Short- term borrowings $ 157,100,000 ¥ 998,500,000    
Short-term Investments | ¥   ¥ 442,000,000    
Number of subsidiaries 1      
Interest rate (as a percent) 1.60% 1.60%    
Borrowing with an interest rate of 1.9% to 2.0%        
Short-term borrowings        
Number of borrowings 3      
Short- term borrowings $ 125,000,000 ¥ 794,500,000    
Restricted cash | ¥   ¥ 57,700,000    
Number of subsidiaries 1      
Minimum | Borrowing with an interest rate of 1.3% to 2.3%        
Short-term borrowings        
Interest rate (as a percent) 1.30% 1.30%    
Minimum | Borrowing with an interest rate of 1.9% to 2.0%        
Short-term borrowings        
Interest rate (as a percent) 1.90% 1.90%    
Maximum | Borrowing with an interest rate of 1.3% to 2.3%        
Short-term borrowings        
Interest rate (as a percent) 2.30% 2.30%    
Maximum | Borrowing with an interest rate of 1.9% to 2.0%        
Short-term borrowings        
Interest rate (as a percent) 2.00% 2.00%