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Components of Net Realized Investment Gains (Losses) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Debt Securities, Available-for-sale [Line Items]        
Total net realized investment gains (losses) $ 7,323 $ (2,690) $ (22,332) $ 11,290
Equity securities, Gross realized gains 4,942 1,681 14,669 26,936
Equity securities, Gross realized losses (55) (3,146) (31,870) (9,076)
Equity securities, Total net realized investment gains (losses) 4,887 (1,465) (17,201) 17,860
Not Designated as Hedging Instrument | Interest Rate Swap        
Debt Securities, Available-for-sale [Line Items]        
Gross realized gains 1,520 341 19,514 341
Gross realized losses (1,360) (2,512) (41,673) (9,745)
Total net realized investment gains (losses) [1] 160 (2,171) (22,159) (9,404)
Fixed Maturities        
Debt Securities, Available-for-sale [Line Items]        
Gross realized gains 2,705 1,054 21,685 5,765
Gross realized losses (429) (108) (4,657) (2,931)
Total net realized investment gains (losses) $ 2,276 $ 946 $ 17,028 $ 2,834
[1] Includes periodic net interest settlements related to the derivatives of $1.4 million and $0.3 million for the quarters ended September 30, 2020 and 2019, respectively, and $3.1 million and $0.7 million for the nine months ended September 30, 2020 and 2019, respectively.