DERIVATIVES AND HEDGING - Fair Value of Freestanding Derivatives (Details) - Not Designated as Hedging Instrument - Oaktree Capital Group Excluding Consolidated Funds - Foreign-currency forward contracts - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Derivative [Line Items]
Notional	$ 19,980	$ 0
Fair Value	221	0
Liabilities, Notional	(261,846)	(156,281)
Liabilities, Fair Value	$ (8,733)	$ (1,703)