Organization and Basis of Presentation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	6 Months Ended	1 Months Ended		1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended		1 Months Ended
	May 31, 2007	Jun. 30, 2012	May 31, 2007 Oaktree Operating Group [Member]	Apr. 12, 2012 Oaktree Operating Group [Member]	Apr. 30, 2012 Class A units	Jun. 30, 2012 Class A units	May 31, 2007 Class B units	Jun. 30, 2012 Class B units	Jun. 30, 2011 Class B units	May 31, 2007 Private Placement [Member] Class A units
Organization and Basis of Presentation (Textual) [Abstract]
Date of formation		Apr. 13, 2007
Stocks sold by Oaktree Capital Group, LLC		322,260,000				7,904,000		2,313,000	1,523,000	23,000,000
Stocks sold by Oaktree Capital Group, LLC					7,888,864
Class A units sold by the selling unitholders					954,159
Net proceeds of stock issued										$ 944.2
Indirect economic interest in Oaktree Operating Group			15.86%				98.15%
Direct economic interest in Oaktree Operating Group			84.14%
Entitlement of voting rights	One vote
Entitlement of voting rights	Ten votes
Percentage of ownership				20.00%
Percentage of voting power				98.00%