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Schedule of Total Investment Return (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Net investment income $ 14,520 $ 12,008
Net realized investment losses (gains) 847 (1,520)
Change in unrealized holding gains 3,547 10,480
Net realized and unrealized investment returns 4,394 8,960
Total investment return $ 18,914 $ 20,968
Total investment return % [1] 1.30% 1.60%
Average investment portfolio [2] $ 1,403,878 $ 1,344,886
[1] Not annualized.
[2] Average of total cash and invested assets, net of receivable/payable for securities, as of the beginning and end of the period.