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Long-term Debt - Schedule of Long-Term Debt (Detail) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Nov. 23, 2021
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total principal amount | $ 103,309 | $ 104,044 |
Less: unamortized debt issuance costs | (1,684) | (2,038) |
Total long-term debt, net | 101,625 | 102,006 |
Surplus note |  |  |
Debt Instrument [Line Items] |  |  |
Total principal amount | 3,309 | 4,044 |
5.625% Senior unsecured notes |  |  |
Debt Instrument [Line Items] |  |  |
Total principal amount | $ 100,000 | $ 100,000 |
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Stated percentage | 5.625% |  | 5.625%

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