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Investments - Company's Investments and Securities Sold, Not Yet Purchased (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Total investments | $ 638,960 | $ 1,007,339
Investments, at fair value | 623,222 | 991,089
Securities sold, not yet purchased, at fair value (included in "other liabilities") | 4,301 | 6,828
Debt [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments |  | 299,990
Investments, at fair value |  | 299,990
Equities [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 39,747 | 54,040
Investments, at fair value | 39,747 | 54,040
Alternative Investment Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 54,201 | 49,757
Investments, at fair value | 54,201 | 49,757
Debt Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 167,763 | 164,952
Investments, at fair value | 167,763 | 164,952
Equity Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 319,707 | 375,761
Investments, at fair value | 319,707 | 375,761
Private Equity Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 41,804 | 46,589
Investments, at fair value | 41,804 | 46,589
Funds Total [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 583,475 | 637,059
Equity Method [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | $ 15,738 | $ 16,250

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