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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Schedule Of Available For Sale Securities [Line Items]        
Total net realized investment gains (losses) $ (133) $ 2,234 $ (2,414) $ (33,067)
Equity securities, Gross realized gains 163 159 726 1,803
Equity securities, Gross realized losses (178) (219) (1,829) (5,623)
Equity securities, Total net realized investment gains (losses) (15) (60) (1,103) (3,820)
Not Designated as Hedging Instrument | Interest Rate Swap        
Schedule Of Available For Sale Securities [Line Items]        
Gross realized gains 0 2,906 0 11,867
Gross realized losses 0 (353) 0 (2,774)
Total net realized investment gains (losses) [1] 0 2,553 0 9,093
Fixed Income Securities        
Schedule Of Available For Sale Securities [Line Items]        
Gross realized gains 15 226 29 512
Gross realized losses (133) (485) (1,340) (38,852)
Total net realized investment gains (losses) $ (118) $ (259) $ (1,311) $ (38,340)
[1] Includes periodic net interest settlements related to the derivatives of $0.5 million for the quarters ended September 30, 2022 and $3.0 million for the nine months ended September 30, 2022.