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Fair Value Measurements - Summarizes Carrying Value and Estimated Fair Values of Financial Instruments not Carried at Fair Value (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Nov. 23, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 103,676	$ 104,044
Estimated Fair Value	100,359	102,736
Surplus note
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 3,676	4,044
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Stated percentage	5.625%		5.625%
Surplus note | Surplus note
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 3,676	4,044
Estimated Fair Value	3,492	3,783
5.625% Senior unsecured notes
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	100,000	100,000
Estimated Fair Value	$ 96,867	$ 98,953

X

- Definition

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

+ References

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X

- Definition

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

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- Definition

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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X

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

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