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

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Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instrument must exceed threshold percentage for specified number of trading days to trigger conversion feature.

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Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion.

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

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Amount of the cost of borrowed funds accounted for as interest expense.

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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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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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Financial instruments issued by insurance entities (surplus notes) that are includable in surplus for statutory accounting purposes as prescribed or permitted by state laws and regulations that are liabilities of the issuer.

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