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Schedule of Total Investment Return (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]        
Net investment income $ 13,216 $ 1,930 $ 25,224 $ 8,522
Net realized investment losses (761) (9,916) (2,281) (35,301)
Change in unrealized holding gains (losses) (3,117) (17,488) 7,363 (41,332)
Net realized and unrealized investment returns (3,878) (27,404) 5,082 (76,633)
Total investment return $ 9,338 $ (25,474) $ 30,306 $ (68,111)
Total investment return % [1] 0.70% (1.80%) 2.30% (4.80%)
Average investment portfolio [2] $ 1,345,235 $ 1,395,519 $ 1,343,024 $ 1,429,227
[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.