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v3.24.0.1

Long-Term Debt - Additional Information (Detail) |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Nov. 23, 2021 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jun. 30, 2023 USD ($) | Oct. 31, 2022 USD ($) | Nov. 09, 2006 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Principal repayments of Surplus Note |  | $ 1,500,000 | $ 1,500,000 | $ 1,500,000 |  |  |
Surplus during the term of surplus note |  | $ 50,000,000 |  |  |  |  |
2022 Revolving Loan | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 37,500,000 |
2023 Revolving Loan | Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt term |  |  |  |  | 364 days |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  | $ 40,000,000 |  |
Line of credit facility, unused capacity, commitment fee percentage |  | 0.50% |  |  |  |  |
2023 Revolving Loan | Revolving Credit Facility | Prime Rate |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |  |  |  |  |
Surplus note |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unsecured term loan agreement |  |  |  |  |  |  | $ 25,000,000
Debt term |  |  |  |  |  |  | 20 years
Effective interest rate |  | 4.30% | 2.83% | 1.50% |  |  |
Principal repayments of Surplus Note |  | $ 368,000 |  |  |  |  |
Maturity year of debt instrument |  | through 2026 |  |  |  |  |
Net written premium to surplus ratio |  | 2 |  |  |  |  |
Gross written premium to surplus ratio |  | 6 |  |  |  |  |
Surplus note | Hurricane |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Surplus and Reinsurance sufficient to cover in excess of UPCIC probable maximum loss |  | 1-in-100 year |  |  |  |  |
Unsecured Debt |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Repurchased amount | $ 100,000,000 |  |  |  |  |  |
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Unsecured term loan agreement | $ 100,000,000 |  |  |  |  |  |
Maturity year of debt instrument |  | 2026 |  |  |  |  |
Stated percentage |  | 5.625% |  |  |  |  |
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 | Debt Instrument, Redemption, Period One |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price | 102.8125% |  |  |  |  |  |
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 | Debt Instrument, Redemption, Period Two |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price | 101.40625% |  |  |  |  |  |
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 | Debt Instrument, Redemption, Period Three |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Redemption price | 100.00% |  |  |  |  |  |

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