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Investments - Major Categories of the Company's Net Investment Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Total gross investment income $ 31,293 $ 32,269 $ 28,225
Investment expenses (2,081) (930) (1,002)
Net investment income 29,212 31,339 27,223
Fixed Maturity Securities Available for Sale [Member]      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Total gross investment income 26,341 26,357 24,399
Equity Securities [Member]      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Total gross investment income 1,003 1,456 1,566
Short-term Investments [Member]      
Schedule Of Investment Income Reported Amounts By Category [Line Items]      
Total gross investment income $ 3,949 $ 4,456 $ 2,260