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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 | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | $ 771,224 | $ 991,089
Derivative Assets | 19,098 | 922
Total investments measured at fair value | 790,322 | 992,011
Securities sold, not yet purchased | 4,948 | 6,828
Derivative Liabilities | 349,211 | 372,245
Total of Liabilities Measured at Fair Value | 354,159 | 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 | 705,033 | 919,083
Securities sold, not yet purchased | 4,948 | 6,828
Derivative Liabilities | 2,875 | 10,005
Total of Liabilities Measured at Fair Value | 7,823 | 16,833
Level 2 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Derivative Assets | 19,098 | 922
Total investments measured at fair value | 19,098 | 922
Derivative Liabilities | 346,336 | 362,240
Total of Liabilities Measured at Fair Value | 346,336 | 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 | 798 | 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 | 65,393 | 71,135
Debt [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 99,988 | 299,990
Debt [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 99,988 | 299,990
Equities [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 45,704 | 54,040
Equities [Member] | Level 1 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 45,162 | 53,462
Equities [Member] | Level 3 [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 542 | 578
Alternative Investment Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 54,003 | 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 | 26,064 | 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 | 27,939 | 24,785
Debt Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 181,322 | 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 | 181,317 | 164,947
Debt Funds [Member] | NAV [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 5 | 5
Equity Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 352,544 | 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 | 352,502 | 375,712
Equity Funds [Member] | NAV [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 42 | 49
Private Equity Funds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | 37,663 | 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 | 256 | 293
Private Equity Funds [Member] | NAV [Member] | Fair Value, Measurements, Recurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items] |  |
Investments | $ 37,407 | $ 46,296

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