UNITHOLDERS' CAPITAL - Summary of Net Income (Loss) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Weighted average Oaktree Operating Group units outstanding (in thousands):
Weighted average Oaktree Operating Group units outstanding (in shares)	98,677	75,995	98,457	74,005
Oaktree Operating Group net income (loss):
Oaktree Operating Group net income (loss)	$ 67,494	$ (20,898)	$ (187,847)	$ 285,030
Net income (loss) attributable to OCG Class A unitholders:
Oaktree Operating Group net income (loss) attributable to OCG Class A unitholders	45,902	(6,708)	(19,878)	91,226
Non-Operating Group expense	(348)	(3,967)	(906)	(8,287)
Income tax benefit (expense) of Intermediate Holding Companies	0	(5,973)	0	(9,889)
Net income (loss) attributable to OCG Class A unitholders	$ 45,554	$ (16,648)	$ (20,784)	$ 73,050
Oaktree Operating Group
Weighted average Oaktree Operating Group units outstanding (in thousands):
Weighted average Oaktree Operating Group units outstanding (in shares)	160,062	159,661	159,965	158,801
Oaktree Operating Group net income (loss):
Oaktree Operating Group net income (loss)	$ 81,724	$ (7,268)	$ (12,697)	$ 219,193
Net income (loss) attributable to OCG Class A unitholders:
OCGH non-controlling interest	$ 0	$ 518	$ 0	$ 1,779
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)	61,385	83,666	61,508	84,796
Oaktree Operating Group net income (loss):
Oaktree Operating Group net income (loss)	$ 28,993	$ (7,389)	$ (13,306)	$ 107,480
Series A Preferred Units | Oaktree Operating Group
Oaktree Operating Group net income (loss):
Oaktree Operating Group net income (loss)	$ 6,829	$ 6,829	$ 20,487	$ 20,487
Class A Units | Oaktree Operating Group
Weighted average Oaktree Operating Group units outstanding (in thousands):
Weighted average Oaktree Operating Group units outstanding (in shares)	98,677	75,995	98,457	74,005
Oaktree Operating Group net income (loss):
Oaktree Operating Group net income (loss)	$ 45,902	$ (6,708)	$ (19,878)	$ 91,226