UNITHOLDERS' CAPITAL - Changes in Company Ownership Interest (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) entity	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Oct. 01, 2019 entity
Equity [Abstract]
Net income attributable to OCG Class A unitholders	$ 127,523	$ 211,141	$ 231,494
Equity reallocation between controlling and non-controlling interests	306,015	80,106	23,151
Change from net income attributable to OCG Class A unitholders and transfers from non-controlling interests	$ 433,538	$ 291,247	$ 254,645
Number of former indirect subsidiaries | entity				4
Number of indirect subsidiaries | entity	6			6