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Investments - Company's Investments and Securities Sold, Not Yet Purchased (Detail) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Schedule of Investments [Line Items] |  |
Total investments | $ 741,868 | $ 698,977
Investments, at fair value | 741,868 | 683,496
Securities sold, not yet purchased, at fair value (included in "other liabilities") | 4,106 | 4,651
Debt [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 4,116 |
Investments, at fair value | 4,116 |
Equities [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 52,088 | 43,889
Investments, at fair value | 52,088 | 43,889
Alternative Investment Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 70,233 | 56,947
Investments, at fair value | 70,233 | 56,947
Debt Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 205,701 | 178,556
Investments, at fair value | 205,701 | 178,556
Equity Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 358,202 | 350,282
Investments, at fair value | 358,202 | 350,282
Private Equity Funds [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | 51,528 | 53,822
Investments, at fair value | 51,528 | 53,822
Funds Total [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments | $ 685,664 | 639,607
Equity Method Investments [Member] |  |
Schedule of Investments [Line Items] |  |
Total investments |  | $ 15,481

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