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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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