v3.25.2
Schedule of Total Investment Return (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Net investment income $ 14,707 $ 15,311 $ 29,489 $ 29,831
Net realized investment gains 127 205 263 1,052
Change in unrealized holding gains (losses) 2,833 2,387 7,216 5,934
Net realized and unrealized investment returns 2,960 2,592 7,479 6,986
Total investment return $ 17,667 $ 17,903 $ 36,968 $ 36,817
Total investment return % [1] 1.20% 1.30% 2.60% 2.60%
Average investment portfolio $ 1,432,379 $ 1,426,266 [2] $ 1,436,827 [2] $ 1,412,821 [2]
[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.