EQUITY-BASED COMPENSATION - Summary of Unvested Equity-Based Awards and Changes (Details)	9 Months Ended
	Sep. 30, 2017 $ / shares shares
Class A Units
Number of Units
Beginning balance (in shares) | shares	2,128,400
Granted (in shares) | shares	1,285,548
Vested (in shares) | shares	(806,696)
Forfeited (in shares) | shares	(20,378)
Ending balance (in shares) | shares	2,586,874
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 41.86
Granted (in dollars per share) | $ / shares	45.42
Vested (in dollars per share) | $ / shares	40.39
Forfeited (in dollars per share) | $ / shares	45.59
Ending balance (in dollars per share) | $ / shares	$ 44.06
OCGH Units
Number of Units
Beginning balance (in shares) | shares	2,337,953
Granted (in shares) | shares	274,018
Vested (in shares) | shares	(371,031)
Forfeited (in shares) | shares	0
Ending balance (in shares) | shares	2,240,940
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 39.80
Granted (in dollars per share) | $ / shares	37.15
Vested (in dollars per share) | $ / shares	38.76
Forfeited (in dollars per share) | $ / shares	0.00
Ending balance (in dollars per share) | $ / shares	$ 39.70