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Investments - Additional Information (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Reported Value Measurement [Member] |  |  |  |
Investment [Table] |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 47,276 | $ 19,223 |  |
Other Investments | 28,294 | 18,317 |  |
Securities fair value | 22,861 | 20,748 |  |
Fair Value of Securities Deposited in Connection wtih Letter of Credit | 800 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Equity Securities Excluded From Fair Value | 20,618 | 12,500 |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 47,275 | 19,223 | $ 19,940 | $ 9,969
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 47,275 | 19,223 |  |
Insurance Distribution |  |  |  |
Investment [Table] |  |  |  |
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 2,845 | 1,769 |  |
Private Equity Funds, US |  |  |  |
Investment [Table] |  |  |  |
Other Investments | 7,499 | $ 5,817 |  |
Commitments [Member] | Private Equity Funds |  |  |  |
Investment [Table] |  |  |  |
Other Investments | $ 1,724 |  |  |

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