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Components of Net Realized Investment Gains (Losses) (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Schedule Of Available For Sale Securities [Line Items]          
Net interest settlements $ 0 $ 1,816 $ 0 $ 6,540  
Interest Rate Swap          
Schedule Of Available For Sale Securities [Line Items]          
Net interest settlements   $ 1,100 $ 0 $ 2,500 $ 0