Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Description of the maturity date of the debt instrument including whether the debt matures serially and, if so, a brief description of the serial maturities.

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Amount of the required periodic payments applied to principal.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Face (par) amount of the original debt instrument that was repurchased.

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No definition available.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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No definition available.

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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.

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Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Minimum surplus amount under amended agreement.

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Written premium ratio to surplus gross.

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Written premium ratio to surplus net.

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Long-Term Debt - Additional Information (Detail)		12 Months Ended
Long-Term Debt - Additional Information (Detail)	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%