EARNINGS PER UNIT - Computations of Net Income (Loss) Per Unit (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Earnings Per Share [Abstract]
Net income	$ 49,047	$ 19,814	$ 77,125	$ 58,067
Weighted average number of Class A units outstanding (in shares)	62,617	48,372	62,256	46,727
Basic and diluted net income per Class A unit (in dollars per share)	$ 0.78	$ 0.41	$ 1.24	$ 1.24