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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