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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income (Loss) Before Income Taxes $ 1,944 $ (14,337)
Tax benefit (1,048) 4,368
Net Income (Loss) 896 (9,969)
Reclassification Out of Accumulated Other Comprehensive Loss [Member]    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Defined benefit plan adjustments – actuarial losses (143) (204)
Income (Loss) Before Income Taxes 35 (1,620)
Tax benefit 1 431
Net Income (Loss) 36 (1,189)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Loss [Member]    
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Net investment gain (loss) $ 178 $ (1,416)