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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, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Net income $ 19,814 $ 31,186 $ 58,067 $ 82,980
Weighted average number of Class A units outstanding (in shares) 48,372 43,480 46,727 41,600
Basic and diluted net income per Class A unit (in dollars per share) $ 0.41 $ 0.72 $ 1.24 $ 1.99