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Related-Party Transactions - Additional Information (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Jan. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Related Party Transaction [Line Items]
Revenues		$ 76,932	$ 68,138	$ 64,292	$ 64,686	$ 66,988	$ 65,996	$ 55,833	$ 63,362	$ 274,048	$ 252,179	$ 244,033
Fees receivable		30,384				20,320				30,384	20,320
Payable to related parties pursuant to tax receivable agreement		98,956				69,636				98,956	69,636
Investee shares received upon note receivable conversion (in shares)	2,278,524
Notes receivable	$ 902
Asset acquisition. consideration transferred	6,373
Payments for asset acquisitions	4,000
Asset acquisition, equity shares contributed by investee, value	2,201
Asset acquisition, direct transaction fees	172
Asset acquisition, contingent consideration, liability	$ 1,000
Amortization period of intangible assets acquired	7 years
General Partnerships
Related Party Transaction [Line Items]
Fees receivable		16,970				8,927				16,970	8,927
Joint Venture
Related Party Transaction [Line Items]
Payable to related parties pursuant to tax receivable agreement		428				$ 450				428	450
Service Agreement Fees Paid | Joint Venture
Related Party Transaction [Line Items]
Amount payable to joint venture										5,289	5,058	3,638
Management and advisory fees
Related Party Transaction [Line Items]
Revenues										244,920	217,773	195,030
Management and advisory fees | General Partnerships
Related Party Transaction [Line Items]
Revenues		161,323									134,343	113,507
Incentive fees
Related Party Transaction [Line Items]
Revenues										$ 29,128	34,406	49,003
Incentive fees | General Partnerships
Related Party Transaction [Line Items]
Revenues		$ 24,077									$ 31,876	$ 43,522

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