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Nature of Business - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Defined benefit plan adjustments – actuarial losses                 $ 2,458 $ 5,091  
Loss Before Income Taxes                 (6,246) (24,777) $ (33,371)
Tax benefit (expense)                 8,624 (28,205) 14,029
Net Income (Loss) $ 6,114 $ 5,481 $ 752 $ (9,969) $ (11,624) $ (46,123) $ 3,995 $ 770 2,378 (52,982) (19,342)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Defined benefit plan adjustments – actuarial losses                 (1,212) (771) (196)
Loss Before Income Taxes                 (627) (374) 608
Tax benefit (expense)                 224 136 (148)
Net Income (Loss)                 (403) (238) 460
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]                      
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Net investment gain (loss)                 $ 585 $ 397 $ 804