Changes in Level 3 Assets and Liabilities of CIVs (Details 5) - Fair Value, Inputs, Level 3 [Member] - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Fair Value Disclosures [Abstract]
Unrealized gains (losses) on Level 3 assets and liabilities still held at the reporting date	$ (4,040)	$ (1,331)
CIVs
ASSETS:
Assets measured at fair value using significant unobservable inputs, value at beginning of period		49,698
Purchases		1,173
Sales		(682)
Redemptions/Settlements/Other		0
Transfers, Net		0
Realized and unrealized gains/(losses), net		1,980
Assets measured at fair value using significant unobservable inputs, value at end of period		52,169
Fair Value Disclosures [Abstract]
Total realized and unrealized gains (losses), net		1,980
Unrealized gains (losses) on Level 3 assets and liabilities still held at the reporting date	(45)	1,850
Hedge Funds | CIVs
ASSETS:
Assets measured at fair value using significant unobservable inputs, value at beginning of period	14,093	17,888
Purchases	137	160
Sales	(310)	(682)
Redemptions/Settlements/Other	0	0
Transfers, Net	(526)	0
Realized and unrealized gains/(losses), net	88	(314)
Assets measured at fair value using significant unobservable inputs, value at end of period	$ 13,482	17,052
Private Equity Funds | CIVs
ASSETS:
Assets measured at fair value using significant unobservable inputs, value at beginning of period		31,810
Purchases		1,013
Sales		0
Redemptions/Settlements/Other		0
Transfers, Net		0
Realized and unrealized gains/(losses), net		2,294
Assets measured at fair value using significant unobservable inputs, value at end of period		35,117
Collateralized Debt Obligations [Member] | CIVs
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