UNITHOLDERS' CAPITAL - Additional Information (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Total unitholders’ capital	$ 2,099,673	$ 1,885,171	$ 1,744,426	$ 1,808,094
OCGH
Class of Stock [Line Items]
Unitholders' capital (in shares)	92,043,490	91,758,067
Total unitholders’ capital	$ 1,157,840	$ 1,040,274
Oaktree Operating Group
Class of Stock [Line Items]
Total Oaktree Operating Group units (in shares)	156,228,900	154,790,343
Total unitholders’ capital	$ 1,965,265	$ 1,754,882
Equity Held by Third Parties
Class of Stock [Line Items]
Total unitholders’ capital	$ 8,948	$ 10,045