NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO CLASS A COMMON SHAREHOLDERS (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Apr. 30, 2014
Numerator:
Net income (loss) attrributable to holders of shares of Class A common stock - basic	$ 5,336
Class A common stock
Numerator:
Net income (loss) attrributable to holders of shares of Class A common stock - basic	5,336
Net income (loss) attributable to holders of shares of Class A common stock - diluted	$ 5,336
Denominator:
Weighted average shares of Class A common stock outstanding - basic	19,730,182
Weighted average number of incremental shares issuable from unvested restricted stock, RSUs and stock options, as calculated using the treasury stock method	1,218,784
Weighted average shares of Class A common stock outstanding-diluted	20,948,966
Net income (loss) per share attributable to holders of shares of Class A common stock
Basic (in dollars per share)	$ 0.27
Diluted (in dollars per share)	$ 0.25
Number of shares of common stock to be issued upon exchange of a partnership unit	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	55,355,971
Class A common stock | 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	575,287