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Schedule of Total Investment Return (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Net investment income $ 15,311 $ 13,216 $ 29,831 $ 25,224
Net realized investment losses (gains) 205 (761) 1,052 (2,281)
Change in unrealized holding gains 2,387 (3,117) 5,934 7,363
Net realized and unrealized investment returns 2,592 (3,878) 6,986 5,082
Total investment return $ 17,903 $ 9,338 $ 36,817 $ 30,306
Total investment return % [1] 1.30% 0.70% 2.60% 2.30%
Average investment portfolio [2] $ 1,426,266 $ 1,345,235 $ 1,412,821 $ 1,343,024
[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.