UNITHOLDERS' CAPITAL - Summary of Net Income (Loss) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Weighted average Oaktree Operating Group units outstanding (in thousands):
Weighted average Oaktree Operating Group units outstanding (in shares)	98,014	71,632
Oaktree Operating Group net income (loss):
Oaktree Operating Group net income (loss)	$ (442,716)	$ 184,400
Net income (loss) attributable to OCG Class A unitholders:
Oaktree Operating Group net income (loss) attributable to OCG Class A unitholders	(167,062)	54,866
Non-Operating Group (expense)	(666)	(3,644)
Income tax benefit (expense) of Intermediate Holding Companies	0	(3,968)
Net income (loss) attributable to OCG Class A unitholders	$ (167,728)	$ 47,254
Oaktree Operating Group
Weighted average Oaktree Operating Group units outstanding (in thousands):
Weighted average Oaktree Operating Group units outstanding (in shares)	159,784	157,106
Oaktree Operating Group net income (loss):
Oaktree Operating Group net income (loss)	$ (265,950)	$ 127,167
Net income (loss) attributable to OCG Class A unitholders:
OCGH non-controlling interest	0	642
Series A Preferred Units | Oaktree Operating Group
Oaktree Operating Group net income (loss):
Oaktree Operating Group net income (loss)	$ 6,829	$ 6,829
Weighted average Oaktree Operating Group units outstanding (in shares) | Oaktree Operating Group
Weighted average Oaktree Operating Group units outstanding (in thousands):
Weighted average Oaktree Operating Group units outstanding (in shares)	61,770	85,474
Oaktree Operating Group net income (loss):
Oaktree Operating Group net income (loss)	$ (105,717)	$ 65,472
Class A Units | Oaktree Operating Group
Weighted average Oaktree Operating Group units outstanding (in thousands):
Weighted average Oaktree Operating Group units outstanding (in shares)	98,014	71,632
Oaktree Operating Group net income (loss):
Oaktree Operating Group net income (loss)	$ (167,062)	$ 54,866