UNITHOLDERS' CAPITAL - Changes in Company Ownership Interest (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Stockholders' Equity Note [Abstract]
Net income attributable to Oaktree Capital Group, LLC	$ 45,841	$ 58,297	$ 218,080	$ 135,422
Equity reallocation between controlling and non-controlling interests	5,082	3,766	14,581	11,892
Change from net income attributable to Oaktree Capital Group, LLC and transfers from non-controlling interests	$ 50,923	$ 62,063	$ 232,661	$ 147,314