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Schedule of Total Investment Return (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Investments Debt And Equity Securities [Abstract]        
Net investment income $ 11,746 $ 11,348 $ 19,516 $ 32,393
Net realized investment gains (losses) 7,323 (2,690) (22,332) 11,290
Change in unrealized holding gains and losses 32 10,021 22,190 53,457
Net realized and unrealized investment returns 7,355 7,331 (142) 64,747
Total investment return $ 19,101 $ 18,679 $ 19,374 $ 97,140
Total investment return % [1] 1.20% 1.20% 1.30% 6.20%
Average investment portfolio [2] $ 1,541,227 $ 1,585,165 $ 1,528,005 $ 1,562,177
[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.