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Related-Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018
Related Party Transaction [Line Items]
Revenues	$ 63,362	$ 52,701
Payable to related parties pursuant to tax receivable agreement	34,335		$ 34,133
Fees receivable	16,710		14,924
General Partnerships
Related Party Transaction [Line Items]
Fees receivable	6,446		1,929
Joint Venture
Related Party Transaction [Line Items]
Payable to related parties pursuant to tax receivable agreement	405		$ 393
Service Agreement Fees Paid | Joint Venture
Related Party Transaction [Line Items]
Fees paid to joint venture	1,195
Management and advisory fees
Related Party Transaction [Line Items]
Revenues	50,979	51,684
Management and advisory fees | General Partnerships
Related Party Transaction [Line Items]
Revenues	30,593	32,867
Incentive fees
Related Party Transaction [Line Items]
Revenues	12,383	1,017
Incentive fees | General Partnerships
Related Party Transaction [Line Items]
Revenues	$ 11,892	$ 598

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