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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, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]                      
Defined benefit plan adjustments – actuarial losses                 $ (3,327) $ 2,458  
Loss Before Income Taxes                 (6,305) (6,246) $ (24,777)
Tax benefit (expense)                 (2,330) 8,624 (28,205)
Net Income (Loss) $ (4,190) $ (10,427) $ 5,086 $ 896 $ 6,114 $ 5,481 $ 752 $ (9,969) (8,635) 2,378 (52,982)
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                 (825) (1,212) (771)
Loss Before Income Taxes                 (989) (627) (374)
Tax benefit (expense)                 (299) (224) (136)
Net Income (Loss)                 (690) (403) (238)
Unrealized (Loss) Gain 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                 $ (164) $ 585 $ 397