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Long-Term Debt - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 23, 2021 USD ($) d | Aug. 31, 2020 | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Aug. 31, 2021 USD ($) | Dec. 31, 2006 | Nov. 09, 2006 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Surplus note |  |  | $ 7,000,000 |  |  |  |  |
Principal repayments of Surplus Note |  |  | 1,500,000 | $ 1,500,000 | $ 1,500,000 |  |  |
Surplus during the term of surplus note |  |  | 50,000,000 |  |  |  |  |
Interest expense |  |  | $ 638,000 | $ 95,000 | $ 243,000 |  |  |
Credit Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  | $ 35,000,000 |  |
Line of credit facility, unused capacity, commitment fee percentage |  | 0.50% |  |  |  |  |  |
Credit Agreement | Prime Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, expiration period |  | 364 days |  |  |  |  |  |
Surplus note |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Unsecured term loan agreement |  |  |  |  |  |  |  | $ 25,000,000
Debt term |  |  |  |  |  |  | 20 years |
Effective interest rate |  |  | 1.50% | 1.05% | 2.32% |  |  |
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% |  |  |  |  |
Interest expense |  |  | $ 113,000 | $ 95,000 | $ 243,000 |  |  |
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% |  |  |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger | 0.25% |  |  |  |  |  |  |
Debt instrument, convertible, threshold trading days | d | 120 |  |  |  |  |  |  |
Debt instrument, convertible, threshold consecutive trading days | d | 90 |  |  |  |  |  |  |
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger | 0.50% |  |  |  |  |  |  |
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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- Definition Description of long-term debt arrangements, which are debt arrangements that originally require full repayment more than twelve months after issuance or greater than the normal operating cycle of the company, if longer, and disclosures pertaining to the underlying arrangements, including repayment terms, conversion features, interest rates, restrictions on assets and activities, debt covenants, and other matters important to users of the financial statements. Types of long-term debt arrangements include borrowing under notes payable, bonds payable, debentures, term loans, and other contractual obligations for payment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123467817&loc=d3e21475-112644 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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