INCOME TAXES AND RELATED PAYMENTS - Tax Receivable Agreement (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 May 2007 Restructuring	Nov. 30, 2012 May 2007 Restructuring	Apr. 30, 2012 April 2012 Offering	May 22, 2013 May 2013 Offering	Nov. 30, 2012 Oaktree Operating Group May 2007 Restructuring	Dec. 31, 2013 Oaktree Operating Group April 2012 Offering	Nov. 30, 2013 Oaktree Operating Group April 2012 Offering	Apr. 30, 2012 Oaktree Operating Group April 2012 Offering
Tax Receivable Agreement [Line Items]
Percentage of cash savings (as a percent)	85.00%
Effective income tax rate reconciliation at previous federal and state income tax rate (as a percent)		41.00%
Effective income tax rate reconciliation at federal and state income tax rate (as a percent)		38.00%
Deferred tax assets under tax receivable agreement associated with two thousand and seven private offering before remeasurement		$ 64.4
Deferred tax assets under tax receivable agreement associated with two thousand and seven private offering after remeasurement		56.6
Reduction of TRA		3.4	3.3			2.0
Tax receivable agreement liability		43.8		87.8	114.2		82.9
Change In capital due to TRA and related liability associated with IPO				15.5	20.2				0.3
Deferred tax asset				103.3				2.9	2.3
Payments to unitholders under TRA					134.4
Liability payments under TRA		$ 6.3