EQUITY-BASED COMPENSATION - Summary of Unvested Equity-Based Awards and Changes (Details)	6 Months Ended
	Jun. 30, 2017 $ / shares shares
Class A Units
Number of Units
Beginning balance (in shares) | shares	2,128,400
Granted (in shares) | shares	1,212,329
Vested (in shares) | shares	(744,749)
Forfeited (in shares) | shares	(16,694)
Ending balance (in shares) | shares	2,579,286
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 41.86
Granted (in dollars per share) | $ / shares	45.30
Vested (in dollars per share) | $ / shares	40.40
Forfeited (in dollars per share) | $ / shares	45.58
Ending balance (in dollars per share) | $ / shares	$ 43.88
OCGH Units
Number of Units
Beginning balance (in shares) | shares	2,337,953
Granted (in shares) | shares	266,362
Vested (in shares) | shares	(344,702)
Forfeited (in shares) | shares	0
Ending balance (in shares) | shares	2,259,613
Weighted Average Grant Date Fair Value
Beginning balance (in dollars per share) | $ / shares	$ 39.80
Granted (in dollars per share) | $ / shares	37.13
Vested (in dollars per share) | $ / shares	39.23
Forfeited (in dollars per share) | $ / shares	0.00
Ending balance (in dollars per share) | $ / shares	$ 39.62