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Fair Value Measurements - Schedule of Classification of Investments and Certain Other Assets and Liabilities Measured at Fair Value on Recurring Basis and Investments Measured at NAV (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | $ 741,868 | $ 683,496
Derivative Assets | 3,991 | 14,554
Total investments measured at fair value | 745,859 | 698,050
Securities sold, not yet purchased | 4,106 | 4,651
Contingent consideration liability | 6,342 |
Derivative Liabilities | 368,452 | 327,160
Total of Liabilities Measured at Fair Value | 378,900 | 331,811
Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total investments measured at fair value | 647,492 | 599,110
Securities sold, not yet purchased | 4,106 | 4,651
Derivative Liabilities |  | 115
Total of Liabilities Measured at Fair Value | 4,106 | 4,766
Level 2 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Assets | $ 3,991 | $ 14,554
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets
Total investments measured at fair value | $ 3,991 | $ 14,554
Derivative Liabilities | 368,452 | 327,045
Total of Liabilities Measured at Fair Value | 368,452 | 327,045
Level 3 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total investments measured at fair value | 19,773 | 19,418
Contingent consideration liability | 6,342 |
Total of Liabilities Measured at Fair Value | 6,342 |
NAV [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total investments measured at fair value | 74,603 | 64,968
Debt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 4,116 |
Debt [Member] | Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 4,116 |
Equities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 52,088 | 43,889
Equities [Member] | Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 51,454 | 43,243
Equities [Member] | Level 3 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 634 | 646
Alternative Investment Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 70,233 | 56,947
Alternative Investment Funds [Member] | Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 28,066 | 27,073
Alternative Investment Funds [Member] | NAV [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 42,167 | 29,874
Debt Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 205,701 | 178,556
Debt Funds [Member] | Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 205,696 | 178,552
Debt Funds [Member] | NAV [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 5 | 4
Equity Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 358,202 | 350,282
Equity Funds [Member] | Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 358,160 | 350,242
Equity Funds [Member] | NAV [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 42 | 40
Private Equity Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 51,528 | 53,822
Private Equity Funds [Member] | Level 3 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 19,139 | 18,772
Private Equity Funds [Member] | NAV [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | $ 32,389 | $ 35,050

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