VARIABLE INTEREST ENTITIES VARIABLE INTEREST ENTITIES (Details) RSO (USD $)	3 Months Ended		1 Months Ended	0 Months Ended	1 Months Ended		12 Months Ended	1 Months Ended		0 Months Ended	1 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Oct. 31, 2012	Nov. 16, 2011	Feb. 28, 2011 Entity	May 31, 2013	Dec. 31, 2014	Feb. 28, 2013 Entity	Feb. 28, 2014	Jul. 29, 2014	Sep. 30, 2014
Variable Interest Entity [Line Items]
Borrowings	$ 21,174,000						$ 20,412,000
Investment in RCAM [Member]
Variable Interest Entity [Line Items]
Fee income	965,000	1,700,000
RSO [Member]
Variable Interest Entity [Line Items]
Number Of Credits Supported In VIEs	2
Investments in unconsolidated entities	55,488,000						59,827,000
Borrowings	1,924,932,000						1,717,076,000
Intangible assets	9,229,000						9,736,000
Fee income	1,605,000	2,500,000
Preferred equity acquired			66.60%
RSO [Member] | Series B Preferred Stock [Member]
Variable Interest Entity [Line Items]
Preferred stock, coupon authorized				8.00%
RSO [Member] | Investment in RCAM [Member]
Variable Interest Entity [Line Items]
Number of CLOs held by purchased entity					5
Acquisition					22,500,000
Intangible assets	9,000,000						9,400,000
Fee income	965,000	1,700,000
RSO [Member] | RSO [Member]
Variable Interest Entity [Line Items]
Number of consolidated VIEs	12
Financial support provided to VIEs	0	500,000
RSO [Member] | RSO [Member] | Moselle [Member]
Variable Interest Entity [Line Items]
Payments to Acquire Equity Method Investments	30,400,000
RSO [Member] | RSO [Member] | Investment in RCAM [Member]
Variable Interest Entity [Line Items]
Preferred equity acquired			66.60%			68.30%
RSO [Member] | RCM Global Manager, LLC [Member]
Variable Interest Entity [Line Items]
Ownership percentage in VIE	53.20%
RSO [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | LEAF [Member]
Variable Interest Entity [Line Items]
Ownership percentage in VIE	28.40%			26.70%
Investments in unconsolidated entities	39,500,000			36,300,000			39,400,000
Variable interest entity, number of board positions held by the company	2
Variable interest entity, total number of board positions	6
RSO [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | LEAF [Member] | Series A Preferred Stock [Member]
Variable Interest Entity [Line Items]
Shares received in equity method transaction (in shares)				31,341
Payments to Acquire Equity Method Investments							3,700,000
RSO [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | LEAF [Member] | Series B Preferred Stock [Member]
Variable Interest Entity [Line Items]
Shares received in equity method transaction (in shares)				4,872
RSO [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | LEAF [Member] | Series D Preferred Stock [Member]
Variable Interest Entity [Line Items]
Shares received in equity method transaction (in shares)				2,364
RSO [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | LEAF [Member] | Series A1 Preferred Stock [Member]
Variable Interest Entity [Line Items]
Shares received in equity method transaction (in shares)							3,682
RSO [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | LEAF [Member] | Series E Preferred Stock [Member]
Variable Interest Entity [Line Items]
Shares received in equity method transaction (in shares)							4,445
Payments to Acquire Equity Method Investments							4,400,000
RSO [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Investment in RCT I and RCT II [Member]
Variable Interest Entity [Line Items]
Ownership percentage in VIE	100.00%
Investments in unconsolidated entities	1,500,000
RSO [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Interest in RCT I [Member]
Variable Interest Entity [Line Items]
Percentage of total value of trusts owned	3.00%
Borrowings	25,800,000
RSO [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Interest in RCT II [Member]
Variable Interest Entity [Line Items]
Percentage of total value of trusts owned	3.00%
Borrowings	25,800,000
RSO [Member] | Variable Interest Entity, Not Primary Beneficiary [Member] | Investment in RCAM [Member]
Variable Interest Entity [Line Items]
Number of CLOs held by purchased entity					4
Number of Collateralized Loan Obligations Liquidated								1
Class 1 Subordinated Notes [Member] | RSO [Member] | Moselle [Member]
Variable Interest Entity [Line Items]
Percentage of Outstanding Notes Purchased									100.00%
Class 2 Subordinated Notes [Member] | RSO [Member] | Moselle [Member]
Variable Interest Entity [Line Items]
Percentage of Outstanding Notes Purchased									67.90%
RCC Residential, Inc. [Member] | RSO [Member]
Variable Interest Entity [Line Items]
Payments to Acquire Equity Method Investments										15,000,000
Ownership percentage										63.80%
Payments to Acquire Businesses and Interest in Affiliates										23,500,000
Pelium [Member] | RSO [Member]
Variable Interest Entity [Line Items]
Payments to Acquire Equity Method Investments											17,500,000
Ownership percentage	71.80%										80.40%
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest											10.00%
Ownership Percentage, Duration											5 years
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest Increase	20.00%
Partners' Capital Account, Contributions											40,000,000
Payments to Acquire Interest in Subsidiaries and Affiliates											$ 2,500,000