EARNINGS PER UNIT - Computations of Net Income (Loss) Per Unit (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net income attributable to Oaktree Capital Group, LLC	$ 45,841	$ 58,297	$ 218,080	$ 135,422
Weighted average number of Class A units outstanding (basic and diluted) (in shares)	64,394	62,755	63,875	62,424
Basic and diluted net income per Class A unit (in dollars per share)	$ 0.71	$ 0.93	$ 3.41	$ 2.17