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CONVERTIBLE SENIOR NOTES AND CAPPED CALL OPTIONS (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
May 17, 2011
USD ($)
$ / shares
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2011
USD ($)
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]              
Aggregate principal amount   ¥ 800,000,000          
Fair value of convertible notes       ¥ 818,857,265      
Foreign exchange gain (loss)   43,055,871 ¥ 51,733,120 2,814,189      
Derivative, fair value   7,277,406        
Capped Call Option [Member]              
Debt Instrument [Line Items]              
Convertible debt, conversion price | $ / shares $ 48.21            
Premium paid for derivative | $ $ 18.0            
Derivative, fair value     17,490,323 21,098,263      
Change in fair value of convertible senior notes and capped call option   ¥ (18,226,535) ¥ (6,170,282) (86,689,063)      
2016 Notes [Member]              
Debt Instrument [Line Items]              
Aggregate principal amount | $ $ 125.0            
Debt issuance date         May 17, 2011    
Debt maturity date         May 15, 2016    
Stated interest rate 4.00%            
Convertible debt, conversion rate 29.6307            
Convertible debt, conversion price | $ / shares $ 33.75            
Debt covenant, ownership interest threshold 50.00%            
Call feature, percentage 100.00%            
Face value of notes repurchased | $         $ 2.0 $ 100.5 $ 22.5
Percentage of notes repurchased   80.40% 18.00%   1.60%    
Percentage of price redeemed at   99.00% 96.00%   41.00%    
Fair value of convertible notes     ¥ 650,916,976 721,541,380      
Foreign exchange gain (loss)   ¥ 392,924 44,945,341 3,039,266      
Gain (loss) from change in fair value of convertible senior notes   ¥ 5,533,892 51,983,783 22,926,918      
2019 Notes [Member]              
Debt Instrument [Line Items]              
Aggregate principal amount | $           $ 150.0  
Debt issuance date   Jan. 22, 2014          
Stated interest rate   4.00%       4.00%  
Convertible debt, conversion rate   21.8221          
Convertible debt, conversion price | $ / shares           $ 45.83  
Call feature, percentage 100.00%            
Face value of notes repurchased | $           $ 88.9  
Percentage of notes repurchased   59.30%          
Percentage of price redeemed at   96.00%          
Fair value of convertible notes   ¥ 423,739,708 856,064,385        
Gain (loss) from change in fair value of convertible senior notes   ¥ (86,482,065) ¥ 14,526,000 ¥ 98,806,924