FAIR VALUE - Valuation Techniques (Details) - Oaktree Capital Group Excluding Consolidated Funds - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total investments	$ 120,291	$ 107,591
Corporate investment – Limited partnership interests | Market approach (value of underlying assets) | Level III
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total investments	75,640	74,663
Contingent consideration liability | Discounted cash flow | Level III
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Contingent consideration liability	$ 19,108	$ 23,567
Minimum | Contingent consideration liability | Discounted cash flow | Level III
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	0.00%
Maximum | Contingent consideration liability | Discounted cash flow | Level III
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	100.00%
Weighted Average | Contingent consideration liability | Discounted cash flow | Level III
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate	36.00%