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Investments - A Summary of the Company's Realized Gains and Losses on Sales, Calls or Redemptions of Investments (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Marketable Securities [Line Items]      
Proceeds from sales $ 34,260 $ 41,905 $ 50,992
Gross realized investment gains 1,054 6,729 3,715
Gross realized investment (losses) (1,446) (173) (51)
Net realized investment gains (losses) (392) 6,556 3,664
Other, including gains (losses) on calls and redemptions (184) 23 (224)
Net realized gains (losses) on investments (576) 6,579 3,440
Fixed Maturity Securities Available for Sale [Member]      
Marketable Securities [Line Items]      
Proceeds from sales 26,327 28,292 42,505
Gross realized investment gains 10 181 365
Gross realized investment (losses) (310) (173) (51)
Net realized investment gains (losses) (300) 8 314
Other, including gains (losses) on calls and redemptions 129   (200)
Net realized gains (losses) on investments (171) 8 114
Equity Securities [Member]      
Marketable Securities [Line Items]      
Proceeds from sales 7,933 12,688 8,487
Gross realized investment gains 1,044 6,548 3,350
Gross realized investment (losses) (1,136)    
Net realized investment gains (losses) (92) 6,548 3,350
Net realized gains (losses) on investments (92) 6,548 3,350
Other [Member]      
Marketable Securities [Line Items]      
Proceeds from sales   925  
Other, including gains (losses) on calls and redemptions (313) 23 (24)
Net realized gains (losses) on investments $ (313) $ 23 $ (24)