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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]    
Cost of sales $ (83,179) $ (81,073)
Income (Loss) Before Provision for Income Taxes 1,078 (14,745)
Tax benefit (308) 3,931
Net Income (Loss) 770 (10,814)
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 (175) (90)
Income (Loss) Before Provision for Income Taxes (113) (163)
Tax benefit 38 36
Net Income (Loss) (75) (127)
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) $ 62 $ (73)