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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Schedule Of Available For Sale Securities [Line Items]        
Total net realized investment gains (losses) $ (761) $ (9,916) $ (2,281) $ (35,301)
Equity securities, Gross realized gains 209 2 784 1,806
Equity securities, Gross realized losses (383) (2,417) (1,872) (5,566)
Equity securities, Total net realized investment gains (losses) (174) (2,415) (1,088) (3,760)
Not Designated as Hedging Instrument | Interest Rate Swap        
Schedule Of Available For Sale Securities [Line Items]        
Gross realized gains 0 2,872 0 8,960
Gross realized losses 0 (1,056) 0 (2,420)
Total net realized investment gains (losses) [1] 0 1,816 0 6,540
Fixed Income Securities        
Schedule Of Available For Sale Securities [Line Items]        
Gross realized gains 9 456 14 662
Gross realized losses (596) (9,773) (1,207) (38,743)
Total net realized investment gains (losses) $ (587) $ (9,317) $ (1,193) $ (38,081)
[1] Includes periodic net interest settlements related to the derivatives of $1.1 million for the quarters ended June 30, 2022 and $2.5 million for the six months ended June 30, 2022.