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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 | Jun. 30, 2024 | Dec. 31, 2023 | Nov. 23, 2021
--- | --- | --- | ---
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Carrying Value | $ 103,309 | $ 104,044 |
Estimated Fair Value | 100,846 | 102,736 |
Surplus note |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |
Carrying Value | $ 3,309 | 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 | $ 3,309 | 4,044 |
Estimated Fair Value | 3,144 | 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 | $ 97,702 | $ 98,953 |

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- 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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