Variable Interest Entities and Consolidation of Investment Vehicles (Details 3) (CIVs, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Mar. 31, 2013
Liabilities:
Derivative liabilities	$ (2,573)	$ (2,930)
Quoted prices in active markets (Level 1)
Trading investments:
Hedge funds	2,238	2,076
Investments:
CLO loans	0	0
CLO bonds	0	0
Private equity funds	0	0
Total investments	0	0
Financial assets measured at fair value	2,238	2,076
Liabilities:
CLO debt	0	0
Derivative liabilities	0	0
Financial liabilities measured at fair value	0	0
Significant other observable inputs (Level 2)
Trading investments:
Hedge funds	3,296	3,268
Investments:
CLO loans	119,673	172,519
CLO bonds	8,701	11,052
Private equity funds	0	0
Total investments	128,374	183,571
Financial assets measured at fair value	131,670	186,839
Liabilities:
CLO debt	0	0
Derivative liabilities	(2,573)	(2,930)
Financial liabilities measured at fair value	(2,573)	(2,930)
Significant unobservable inputs (Level 3)
Trading investments:
Hedge funds	20,189	19,448
Investments:
CLO loans	0	0
CLO bonds	0	0
Private equity funds	29,729	26,982
Total investments	29,729	26,982
Financial assets measured at fair value	49,918	46,430
Liabilities:
CLO debt	(153,676)	(207,835)
Derivative liabilities	0	0
Financial liabilities measured at fair value	(153,676)	(207,835)
Total
Trading investments:
Hedge funds	25,723	24,792
Investments:
CLO loans	119,673	172,519
CLO bonds	8,701	11,052
Private equity funds	29,729	26,982
Total investments	158,103	210,553
Financial assets measured at fair value	183,826	235,345
Liabilities:
CLO debt	(153,676)	(207,835)
Derivative liabilities	(2,573)	(2,930)
Financial liabilities measured at fair value	$ (156,249)	$ (210,765)