Fair Values of Assets and Liabilities (Details 4) - USD ($) $ in Thousands		6 Months Ended
		Sep. 30, 2015		Mar. 31, 2015
Funds-Of-Hedge Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
PercentageDailyRedemption		2.00%
Percentage of Monthly Redemption		10.00%
Percentage of Quarterly Redemption		88.00%
Other Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Percentage of Redemption, Investment Funds, With Less Than One Year		23.00%
Percentage of Investment of 17 Year Redemption		77.00%
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Alternative Investments Fair Value Disclosure	[1]	$ 56,977		$ 62,994
Unfunded Commitments		28,419
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Funds-Of-Hedge Funds [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Alternative Investments Fair Value Disclosure		21,667	[2]	23,787
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Hedge Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Alternative Investments Fair Value Disclosure		12,426		14,515
Unfunded Commitments		20,000
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Private Equity Funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Alternative Investments Fair Value Disclosure		21,850	[3]	23,563
Unfunded Commitments		$ 8,419
Investments Remaining Term, High End of Range		10 years
Consolidated Entity Excluding Consolidated Investment Vehicles Before Eliminations [Member] | Other Investments [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Alternative Investments Fair Value Disclosure		$ 1,034	[4]	$ 1,129
Investments Remaining Term, Category One		1 year
Investments Remaining Term, Category Two		17 years
Fair Value, Inputs, Level 1 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value, Percent of Total		1.00%		0.00%
Fair Value, Inputs, Level 2 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value, Percent of Total		37.00%		38.00%
Fair Value, Inputs, Level 3 [Member]
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value, Investments, Entities that Calculate Net Asset Value, Percent of Total		62.00%		62.00%

[1] Comprised of 1%, 37%, and 62% of Level 1, Level 2, and Level 3 assets, respectively, as of September 30, 2015 and 38% and 62% of Level 2 and Level 3 assets, respectively, as of March 31, 2015.

[2] Liquidation restrictions: 2% daily redemption, 10% monthly redemption and 88% quarterly redemption as of September 30, 2015.

[3] Liquidations are expected over the remaining term.

[4] Of this balance, 23% has a remaining term of less than one year and 77% has a remaining term of 17 years.