FAIR VALUE FAIR VALUE - Valuation Technique (Details) - Oaktree Capital Group Excluding Consolidated Funds $ in Thousands	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	$ 34,934	$ 74,899
Corporate investment – Limited partnership interests | Market approach (value of underlying assets) | Level III
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Total investments	30,311	45,426
Contingent liability | Discounted cash flow | Level III
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent liability	$ 0	$ (6,657)
Discount rate | Contingent liability | Discounted cash flow | Level III | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration liability, measurement input	0.00
Discount rate | Contingent liability | Discounted cash flow | Level III | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration liability, measurement input	1.00
Discount rate | Contingent liability | Discounted cash flow | Level III | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Contingent consideration liability, measurement input	0.23