DERIVATIVES AND HEDGING - Balance Sheet Offsetting (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Derivative Assets:
Gross and Net Amounts of Assets Presented	$ 6,890	$ 6,502
Gross Amounts Not Offset in Statements of Financial Condition, Derivative Assets	0	1,497
Gross Amounts Not Offset in Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount	6,890	5,005
Derivative Liabilities:
Gross and Net Amounts of Liabilities	(4,254)	(2,961)
Gross Amounts Not Offset in Statements of Financial Condition, Derivative (Liabilities)	0	(1,497)
Gross Amounts Not Offset in Statements of Financial Condition, Cash (Pledged)	0	0
Net Amount	(4,254)	(1,464)
Oaktree Capital Group Excluding Consolidated Funds
Derivative Assets:
Gross and Net Amounts of Assets Presented		4,038
Gross Amounts Not Offset in Statements of Financial Condition, Derivative Assets		1,497
Gross Amounts Not Offset in Statements of Financial Condition, Cash Collateral Received		0
Net Amount		2,541
Oaktree Capital Group Excluding Consolidated Funds | Foreign-currency forward contracts
Derivative Assets:
Gross and Net Amounts of Assets Presented		1,654
Gross Amounts Not Offset in Statements of Financial Condition, Derivative Assets		1,497
Gross Amounts Not Offset in Statements of Financial Condition, Cash Collateral Received		0
Net Amount		157
Derivative Liabilities:
Gross and Net Amounts of Liabilities	(1,703)	(2,318)
Gross Amounts Not Offset in Statements of Financial Condition, Derivative (Liabilities)	0	(1,497)
Gross Amounts Not Offset in Statements of Financial Condition, Cash (Pledged)	0	0
Net Amount	(1,703)	(821)
Oaktree Capital Group Excluding Consolidated Funds | Cross-currency swap
Derivative Assets:
Gross and Net Amounts of Assets Presented		2,384
Gross Amounts Not Offset in Statements of Financial Condition, Derivative Assets		0
Gross Amounts Not Offset in Statements of Financial Condition, Cash Collateral Received		0
Net Amount		2,384
Consolidated Funds
Derivative Assets:
Gross and Net Amounts of Assets Presented	6,890	2,464
Gross Amounts Not Offset in Statements of Financial Condition, Derivative Assets	0	0
Gross Amounts Not Offset in Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount	6,890	2,464
Derivative Liabilities:
Gross and Net Amounts of Liabilities	(2,551)	(643)
Consolidated Funds | Foreign-currency forward contracts
Derivative Assets:
Gross and Net Amounts of Assets Presented	6,890	2,275
Gross Amounts Not Offset in Statements of Financial Condition, Derivative Assets	0	0
Gross Amounts Not Offset in Statements of Financial Condition, Cash Collateral Received	0	0
Net Amount	6,890	2,275
Derivative Liabilities:
Gross and Net Amounts of Liabilities	(2,551)	(643)
Gross Amounts Not Offset in Statements of Financial Condition, Derivative (Liabilities)	0	0
Gross Amounts Not Offset in Statements of Financial Condition, Cash (Pledged)	0	0
Net Amount	$ (2,551)	(643)
Consolidated Funds | Options and futures
Derivative Assets:
Gross and Net Amounts of Assets Presented		189
Gross Amounts Not Offset in Statements of Financial Condition, Derivative Assets		0
Gross Amounts Not Offset in Statements of Financial Condition, Cash Collateral Received		0
Net Amount		$ 189