Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 135,509	$ 78,995
Management and advisory fees
Disaggregation of Revenue [Line Items]
Revenues	85,946	73,884
Specialized funds
Disaggregation of Revenue [Line Items]
Revenues	43,649	33,388
Customized separate accounts
Disaggregation of Revenue [Line Items]
Revenues	28,375	24,500
Advisory
Disaggregation of Revenue [Line Items]
Revenues	6,248	6,366
Reporting and other
Disaggregation of Revenue [Line Items]
Revenues	6,318	5,282
Distribution management
Disaggregation of Revenue [Line Items]
Revenues	496	4,121
Fund reimbursement revenue
Disaggregation of Revenue [Line Items]
Revenues	860	227
Incentive fees
Disaggregation of Revenue [Line Items]
Revenues	49,563	5,111
Incentive fees | Consolidated Entity Excluding Variable Interest Entities (VIE)
Disaggregation of Revenue [Line Items]
Revenues	49,524	2,364
Incentive fees | Primary Beneficiary
Disaggregation of Revenue [Line Items]
Revenues	39	2,747
Specialized funds | Consolidated Entity Excluding Variable Interest Entities (VIE)
Disaggregation of Revenue [Line Items]
Revenues	42,209	1,659
Specialized funds | Primary Beneficiary
Disaggregation of Revenue [Line Items]
Revenues	39	2,747
Customized separate accounts
Disaggregation of Revenue [Line Items]
Revenues	$ 7,315	$ 705