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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 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | $ 683,496 | $ 991,089
Derivative Assets | 14,554 | 922
Total investments measured at fair value | 698,050 | 992,011
Securities sold, not yet purchased | 4,651 | 6,828
Derivative Liabilities | 327,160 | 372,245
Total of Liabilities Measured at Fair Value | 331,811 | 379,073
Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total investments measured at fair value | 599,110 | 919,083
Securities sold, not yet purchased | 4,651 | 6,828
Derivative Liabilities | 115 | 10,005
Total of Liabilities Measured at Fair Value | 4,766 | 16,833
Level 2 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Assets | $ 14,554 | $ 922
Derivative Asset, Statement of Financial Position [Extensible Enumeration] | Other assets | Other assets
Total investments measured at fair value | $ 14,554 | $ 922
Derivative Liabilities | 327,045 | 362,240
Total of Liabilities Measured at Fair Value | 327,045 | 362,240
Level 3 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total investments measured at fair value | 19,418 | 871
NAV [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total investments measured at fair value | 64,968 | 71,135
Equities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 43,889 | 54,040
Equities [Member] | Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 43,243 | 53,462
Equities [Member] | Level 3 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 646 | 578
Alternative Investment Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 56,947 | 49,757
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 | 27,073 | 24,972
Alternative Investment Funds [Member] | NAV [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 29,874 | 24,785
Debt Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 178,556 | 164,952
Debt Funds [Member] | Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 178,552 | 164,947
Debt Funds [Member] | NAV [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 4 | 5
Equity Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 350,282 | 375,761
Equity Funds [Member] | Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 350,242 | 375,712
Equity Funds [Member] | NAV [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 40 | 49
Private Equity Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | 53,822 | 46,589
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 | 18,772 | 293
Private Equity Funds [Member] | NAV [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value | $ 35,050 | 46,296
Debt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value |  | 299,990
Debt [Member] | Level 1 [Member] | Fair Value, Recurring |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments at fair value |  | $ 299,990

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