EARNINGS PER UNIT - Computations of Net Income (Loss) Per Unit (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 58,297	$ 1,887	$ 135,422	$ 59,954
Weighted average number of Class A units outstanding (in shares)	62,755	48,440	62,424	47,304
Basic and diluted net income per Class A unit (in dollars per share)	$ 0.93	$ 0.04	$ 2.17	$ 1.27