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NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO CLASS A COMMON SHAREHOLDERS (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Apr. 30, 2014
Numerator:          
Net income (loss) attributable to holders of shares of Class A common stock - basic $ 9,489 $ 10,090 $ 23,352 $ 22,557  
Class A common stock          
Numerator:          
Net income (loss) attributable to holders of shares of Class A common stock - basic 9,489 10,090 23,352 22,557  
Net income (loss) attributable to holders of shares of Class A common stock - diluted $ 9,489 $ 10,090 $ 23,352 $ 22,557  
Denominator:          
Weighted average shares of Class A common stock outstanding - basic 20,926,745 20,184,835 20,807,189 19,919,675  
Weighted average number of incremental shares issuable from unvested restricted stock, RSUs and stock options, as calculated using the treasury stock method 3,374,318 1,281,186 2,709,050 1,185,848  
Weighted average shares of Class A common stock outstanding—diluted 24,301,063 21,466,021 23,516,239 21,105,523  
Net income (loss) per share attributable to holders of shares of Class A common stock          
Basic (in dollars per share) $ 0.45 $ 0.50 $ 1.12 $ 1.13  
Diluted (in dollars per share) $ 0.39 $ 0.47 $ 0.99 $ 1.07  
Number of shares of common stock to be issued upon exchange of a partnership unit 1   1   1
Fully diluted shares of common stock outstanding if all Class A partnership units were to be exchanged for common stock immediately following the reorganization 58,000,602 55,398,692 57,335,334 55,303,354  
Class A common stock | Restricted stock and RSUs          
Net income (loss) per share attributable to holders of shares of Class A common stock          
Number of antidilutive securities excluded from calculation of diluted income (loss) per share 2,552 15,397 1,211 7,945  
Class A common stock | Stock options          
Net income (loss) per share attributable to holders of shares of Class A common stock          
Number of antidilutive securities excluded from calculation of diluted income (loss) per share 973,859 1,049,977 1,048,196 0