Changes in Level 3 Assets and Liabilities of CIVs (Details 5) - CIVs - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
ASSETS:
Assets measured at fair value using significant unobservable inputs, value at beginning of period		$ 52,169		$ 49,698
Purchases		292		1,465
Sales		(3,898)		(4,580)
Redemptions/Settlements/Other		0		0
Transfers, Net		0		0
Realized and unrealized gains/(losses), net		57		2,037
Assets measured at fair value using significant unobservable inputs, value at end of period		48,620		48,620
Fair Value Disclosures [Abstract]
Total realized and unrealized gains (losses), net				2,037
Unrealized gains (losses) on Level 3 assets and liabilities still held at the reporting date	$ (957)	(520)	$ (1,002)	1,330
Hedge Funds
ASSETS:
Assets measured at fair value using significant unobservable inputs, value at beginning of period	13,482	17,052	14,093	17,888
Purchases	18	292	155	452
Sales	(98)	(1,501)	(408)	(2,183)
Redemptions/Settlements/Other	0	0	0	0
Transfers, Net	0	0	(526)	0
Realized and unrealized gains/(losses), net	(1,012)	548	(924)	234
Assets measured at fair value using significant unobservable inputs, value at end of period	$ 12,390	16,391	$ 12,390	16,391
Private Equity Funds
ASSETS:
Assets measured at fair value using significant unobservable inputs, value at beginning of period		35,117		31,810
Purchases		0		1,013
Sales		(2,397)		(2,397)
Redemptions/Settlements/Other		0		0
Transfers, Net		0		0
Realized and unrealized gains/(losses), net		(491)		1,803
Assets measured at fair value using significant unobservable inputs, value at end of period		32,229		32,229
Collateralized Debt Obligations [Member]
LIABILITIES:
Liabilities measured at fair value using significant unobservable inputs, value at beginning of period				(79,179)
Purchases				0
Sales				0
Redemptions/Settlements/Other				79,179
Transfers, Net				0
Realized and unrealized gains/(losses), net				0
Liabilities measured at fair value using significant unobservable inputs, value at end of period		$ 0		$ 0