Fair Value of Assets and Liabilities of CIVs by Level (Details 3) - Consolidated Investment Vehicles [Member] - USD ($) $ in Thousands		Mar. 31, 2019	Mar. 31, 2018
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		$ 70,197	$ 128,397
Fair Value Measured at Net Asset Value Per Share [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure	[1]	12,547
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets, Fair Value Disclosure		55,182
Other Liabilities, Fair Value Disclosure		$ 4,217

[1] ble(1)Redemption restrictions: 7% daily redemption; 14% monthly redemption; 70% quarterly redemption; and 9% are subject to three to five-year lock-up or side pocket provisi