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Schedule of Total Investment Return (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Net investment income $ 16,488 $ 14,200 $ 46,319 $ 39,424
Net realized investment losses (gains) (512) (133) 540 (2,414)
Change in unrealized holding gains 12,787 (1,254) 18,721 6,108
Net realized and unrealized investment returns 12,275 (1,387) 19,261 3,694
Total investment return $ 28,763 $ 12,813 $ 65,580 $ 43,118
Total investment return % [1] 2.00% 0.90% 4.60% 3.20%
Average investment portfolio [2] $ 1,451,641 $ 1,355,077 $ 1,429,253 $ 1,354,727
[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.