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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]                
Cost of sales $ (67,761)     $ (81,887)     $ (242,316) $ (241,012)
Income (Loss) Before Income Taxes (18,406)     3,220     (13,921) (22,784)
Tax benefit (expense) (27,717)     4,369     (27,437) 11,889
Net Income (Loss) (46,123) $ 3,995 $ 770 7,589 $ (7,670) $ (10,814) (41,358) (10,895)
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 (130)     (54)     (523) (151)
Income (Loss) Before Income Taxes (162)     1,622     (395) 1,201
Tax benefit (expense) 48     (419)     129 (316)
Net Income (Loss) (114)     1,203     (266) 885
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 $ (32)     $ 1,676     $ 128 $ 1,352