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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income (Loss) Before Income Taxes $ (14,337) $ 1,078
Tax benefit 4,368 (308)
Net Income (Loss) (9,969) 770
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 (204) (175)
Income (Loss) Before Income Taxes (1,620) (113)
Tax benefit 431 38
Net Income (Loss) (1,189) (75)
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 $ (1,416) $ 62