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Schedule of Total Investment Return (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Investments, Debt and Equity Securities [Abstract]      
Net investment income $ 62,375 $ 55,444 $ 27,627
Net realized investment gains (losses) 455 (2,107) (32,929)
Change in unrealized holding gains (losses) 15,496 25,166 (61,627)
Net realized and unrealized investment returns 15,951 23,059 (94,556)
Total investment return $ 78,326 $ 78,503 $ (66,929)
Total investment return % 5.50% 5.70% (4.70%)
Average investment portfolio [1] $ 1,415,549 $ 1,366,553 $ 1,437,327
[1] Average of total cash and invested assets, net of receivable/payable for securities, as of the beginning and end of the period.