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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, 2022
Dec. 31, 2021
Nov. 23, 2021
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Carrying Value $ 106,250 $ 106,985  
Estimated Fair Value 105,547 106,187  
Surplus note      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Carrying Value $ 6,250 6,985  
Unsecured Debt | 5.625% Senior Unsecured Notes Due 2026 Member      
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 $ 6,250 6,985  
Estimated Fair Value 5,933 6,723  
5.625% Senior unsecured notes      
Fair Value Measurement Inputs and Valuation Techniques [Line Items]      
Carrying Value 100,000 100,000  
Estimated Fair Value $ 99,614 $ 99,464