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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	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	$ 741,868	$ 683,496
Derivative Assets	3,991	14,554
Total investments measured at fair value	745,859	698,050
Securities sold, not yet purchased	4,106	4,651
Contingent consideration liability	6,342
Derivative Liabilities	368,452	327,160
Total of Liabilities Measured at Fair Value	378,900	331,811
Level 1 [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total investments measured at fair value	647,492	599,110
Securities sold, not yet purchased	4,106	4,651
Derivative Liabilities		115
Total of Liabilities Measured at Fair Value	4,106	4,766
Level 2 [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Derivative Assets	$ 3,991	$ 14,554
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other assets	Other assets
Total investments measured at fair value	$ 3,991	$ 14,554
Derivative Liabilities	368,452	327,045
Total of Liabilities Measured at Fair Value	368,452	327,045
Level 3 [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total investments measured at fair value	19,773	19,418
Contingent consideration liability	6,342
Total of Liabilities Measured at Fair Value	6,342
NAV [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Total investments measured at fair value	74,603	64,968
Debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	4,116
Debt [Member] | Level 1 [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	4,116
Equities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	52,088	43,889
Equities [Member] | Level 1 [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	51,454	43,243
Equities [Member] | Level 3 [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	634	646
Alternative Investment Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	70,233	56,947
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	28,066	27,073
Alternative Investment Funds [Member] | NAV [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	42,167	29,874
Debt Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	205,701	178,556
Debt Funds [Member] | Level 1 [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	205,696	178,552
Debt Funds [Member] | NAV [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	5	4
Equity Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	358,202	350,282
Equity Funds [Member] | Level 1 [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	358,160	350,242
Equity Funds [Member] | NAV [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	42	40
Private Equity Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	51,528	53,822
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	19,139	18,772
Private Equity Funds [Member] | NAV [Member] | Fair Value, Recurring
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]
Investments at fair value	$ 32,389	$ 35,050

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