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Related-Party Transactions - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Mar. 31, 2019
Related Party Transaction [Line Items]
Revenues	$ 68,138	$ 65,996	$ 197,116	$ 185,191
Payable to related parties pursuant to tax receivable agreement	101,404		101,404		$ 69,636
Long-term Debt	877		877		678
Fees receivable	19,456		19,456		20,320
General Partnerships
Related Party Transaction [Line Items]
Fees receivable	3,668		3,668		8,927
Joint Venture
Related Party Transaction [Line Items]
Payable to related parties pursuant to tax receivable agreement	423		423		$ 450
Service Agreement Fees Paid | Joint Venture
Related Party Transaction [Line Items]
Fees paid to joint venture	1,261	1,277	4,006	3,725
Management and advisory fees
Related Party Transaction [Line Items]
Revenues	59,837	55,617	179,584	159,844
Management and advisory fees | General Partnerships
Related Party Transaction [Line Items]
Revenues	39,141	33,724	117,941	97,168
Incentive fees
Related Party Transaction [Line Items]
Revenues	8,301	10,379	17,532	25,347
Incentive fees | General Partnerships
Related Party Transaction [Line Items]
Revenues	$ 5,731	$ 10,267	$ 14,850	$ 24,857
RAPM
Related Party Transaction [Line Items]
Percent of total payment to principals of RAPM	50.00%		50.00%
RAPM | Former principals of RAPM, current employees of Company
Related Party Transaction [Line Items]
Portion of asset acquisition paid in cash			$ 3,824
Common Class A | RAPM | Former principals of RAPM, current employees of Company
Related Party Transaction [Line Items]
Portion of acquisition paid by issuing common stock			$ 425

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