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SHARE-BASED COMPENSATION - Option activity (Details) - ¥ / shares
 9 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Number of options    
Options outstanding at January 1, 2017 (in shares) 28,589,782  
Granted (in shares) 166,667  
Exercise of share options (in shares) (376,984)  
Forfeited (in shares) (19,000)  
Options outstanding at September 30, 2017 (in shares) 28,360,465  
Weighted average exercise price    
Options outstanding at January 1, 2017 (in RMB per share) ¥ 5.2  
Granted (in RMB per share) 5.3  
Exercised (in RMB per share) 5.2  
Forfeited (in RMB per share) 5.2  
Options outstanding at September 30, 2017 (in RMB per share) 5.2  
Weighted average grant-date fair value per option    
Options outstanding at January 1, 2017 (in RMB per share) 3.2  
Granted (in RMB per share) 7.6  
Exercised (in RMB per share) 1.9  
Forfeited (in RMB per share) 1.9  
Options outstanding at September 30, 2017 (in shares) ¥ 3.2  
Options vested and expect to vest    
Number of options 28,360,465  
Weighted average exercise price (in RMB per share) ¥ 5.2  
Weighted average grant-date fair value per option (in RMB per share) ¥ 3.2  
Stock options outstanding and stock options exercisable    
Number of shares 28,360,465  
Weighted average remaining contractual life (years) 2 years 6 months  
Weighted average exercise price (in RMB per share) ¥ 5.2  
Employee stock options    
Other disclosures    
Forfeitable and unvested (in shares) 0  
Non-employee options    
Other disclosures    
Forfeitable and unvested (in shares) 433,333 600,000