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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