SEGMENT REPORTING - Reconciliation of Net Income (Loss) Attributable to Oaktree Capital Group, LLC to Adjusted Net Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Segment Reporting Information [Line Items]
Net income attributable to Oaktree Capital Group, LLC	$ 42,948		$ 25,212		$ 157,091		$ 68,539
Equity-based compensation	7,320		7,498		20,877		27,482
Income taxes	726	[1]	5,801	[1]	18,874	[1]	27,493	[1]
Non-Operating Group other income		[2]		[2]		[2]	(6,260)	[2]
Non-Operating Group expenses	271	[2]	115	[2]	947	[2]	393	[2]
OCGH non-controlling interest	129,408	[2]	119,235	[2]	617,191	[2]	379,356	[2]
Ocgh Units Prior to Initial Public Offering in April 2012 [Member]
Segment Reporting Information [Line Items]
Equity-based compensation	6,250	[3]	7,369	[3]	18,231	[3]	27,353	[3]
Investment Management [Member]
Segment Reporting Information [Line Items]
Net income attributable to Oaktree Capital Group, LLC	179,603		157,732		812,334		496,874
Equity-based compensation	1,070		128		2,646		128
Income taxes	0		0		0		0
OCGH non-controlling interest	0		0		0		0
Adjusted net income	$ 179,603		$ 157,732		$ 812,334		$ 496,874

[1] Because adjusted net income is a pre-tax measure, this adjustment eliminates the effect of income tax expense.

[2] Because adjusted net income is calculated at the Operating Group level, this adjustment adds back the effect of items applicable to OCG, its Intermediate Holding Companies or the OCGH non-controlling interest.

[3] This adjustment adds back the effect of equity-based compensation charges related to unit grants made before the Company’s initial public offering, which is excluded from adjusted net income because it is a non-cash charge that does not affect the Company's financial position.