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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 | Dec. 31, 2023 | Dec. 31, 2022
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Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Carrying Value | $ 104,044 | $ 105,515
Estimated Fair Value | 102,736 | 105,476
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Carrying Value | $ 100,000 | 100,000
Stated percentage | 5.625% |
Surplus note |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Carrying Value | $ 4,044 | 5,515
Estimated Fair Value | 3,783 | 5,126
5.625% Senior unsecured notes |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Carrying Value | 100,000 | 100,000
Estimated Fair Value | $ 98,953 | $ 100,350

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- 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. + References No definition available. + Details
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