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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 | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | $ 623,222 | $ 991,089
Derivative Assets | 18,502 | 922
Total investments measured at fair value | 641,724 | 992,011
Securities sold, not yet purchased | 4,301 | 6,828
Derivative Liabilities | 311,145 | 372,245
Total of Liabilities Measured at Fair Value | 315,446 | 379,073
Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total investments measured at fair value | 552,583 | 919,083
Securities sold, not yet purchased | 4,301 | 6,828
Derivative Liabilities | 575 | 10,005
Total of Liabilities Measured at Fair Value | 4,876 | 16,833
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Assets | 18,502 | 922
Total investments measured at fair value | 18,502 | 922
Derivative Liabilities | 310,570 | 362,240
Total of Liabilities Measured at Fair Value | 310,570 | 362,240
Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total investments measured at fair value | 769 | 871
NAV [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Total investments measured at fair value | 69,870 | 71,135
Debt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments |  | 299,990
Debt [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments |  | 299,990
Equities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 39,747 | 54,040
Equities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 39,218 | 53,462
Equities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 529 | 578
Alternative Investment Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 54,201 | 49,757
Alternative Investment Funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 25,937 | 24,972
Alternative Investment Funds [Member] | NAV [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 28,264 | 24,785
Debt Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 167,763 | 164,952
Debt Funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 167,759 | 164,947
Debt Funds [Member] | NAV [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 4 | 5
Equity Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 319,707 | 375,761
Equity Funds [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 319,669 | 375,712
Equity Funds [Member] | NAV [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 38 | 49
Private Equity Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 41,804 | 46,589
Private Equity Funds [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 240 | 293
Private Equity Funds [Member] | NAV [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | $ 41,564 | $ 46,296

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