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Long-Term Debt - Additional Information (Detail) - USD ($) |  |  |  | 1 Months Ended | 10 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2022 | Oct. 31, 2022 | Nov. 23, 2021 | Aug. 31, 2021 | Oct. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2006 | Nov. 09, 2006
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Surplus note | $ 5,500,000 |  |  |  |  | $ 5,500,000 |  |  |  |
Principal repayments of Surplus Note |  |  |  |  |  | 1,500,000 | $ 1,500,000 | $ 1,500,000 |  |
Surplus during the term of surplus note |  |  |  |  |  | $ 50,000,000 |  |  |  |
Revolving Credit Facility | Prime Rate |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |  |  |  |  |  |  |  |
2021 Revolving Loan | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration period |  |  |  | 364 days |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 35,000,000 |  |  | $ 35,000,000 |  |  |  |  |
Borrowings on line of credit facility |  |  |  |  | 0 |  |  |  |  |
2022 Revolving Loan | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Line of credit facility, expiration period |  | 364 days |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 37,500,000 |  |  | $ 37,500,000 |  |  |  |  |
Line of credit facility, unused capacity, commitment fee percentage |  | 0.50% |  |  |  |  |  |  |  |
Borrowings on line of credit facility | $ 0 |  |  |  |  |  |  |  |  |
Surplus note |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Unsecured term loan agreement |  |  |  |  |  |  |  |  |  | $ 25,000,000
Debt term |  |  |  |  |  |  |  |  | 20 years |
Effective interest rate | 2.83% |  |  |  |  | 2.83% | 1.50% | 1.05% |  |
Principal repayments of Surplus Note |  |  |  |  |  | $ 368,000 |  |  |  |
Maturity year of debt instrument |  |  |  |  |  | through 2026 |  |  |  |
Net written premium to surplus ratio |  |  |  |  |  | 200.00% |  |  |  |
Gross written premium to surplus ratio |  |  |  |  |  | 600.00% |  |  |  |
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% |  |  |  |  | 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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