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Schedule of Total Investment Return (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Investments Debt And Equity Securities [Abstract]    
Net investment income $ 12,008 $ 6,592
Net realized investment losses (1,520) (25,385)
Change in unrealized holding gains (losses) 10,480 (23,844)
Net realized and unrealized investment returns 8,960 (49,229)
Total investment return $ 20,968 $ (42,637)
Total investment return % [1] 1.60% (2.80%)
Average investment portfolio [2] $ 1,344,886 $ 1,498,272
[1] Not annualized.
[2] Average of total cash and invested assets, net of receivable/payable for securities purchased and sold, as of the beginning and end of the period.