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Investments - Company's Investments and Securities Sold, Not Yet Purchased (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule of Investments [Line Items] |  |
Total investments | $ 698,977 | $ 1,007,339
Investments, at fair value | 683,496 | 991,089
Securities sold, not yet purchased, at fair value (included in "other liabilities") | 4,651 | 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 | 43,889 | 54,040
Investments, at fair value | 43,889 | 54,040
Alternative Investment Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 56,947 | 49,757
Investments, at fair value | 56,947 | 49,757
Debt Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 178,556 | 164,952
Investments, at fair value | 178,556 | 164,952
Equity Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 350,282 | 375,761
Investments, at fair value | 350,282 | 375,761
Private Equity Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 53,822 | 46,589
Investments, at fair value | 53,822 | 46,589
Funds Total [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 639,607 | 637,059
Equity Method Investments [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | $ 15,481 | $ 16,250

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