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Stockholders' Equity - Reclassifications Out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	$ (91,376)		$ (78,052)		$ (174,555)	$ (159,125)
Income (Loss) Before Benefit for Income Taxes	3,407		(11,259)		4,485	(26,004)
Tax benefit	588		3,589		280	7,520
Net Income (Loss)	3,995	$ 770	(7,670)	$ (10,814)	4,765	(18,484)
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	(217)		(7)		(393)	(97)
Income (Loss) Before Benefit for Income Taxes	(118)		(258)		(232)	(421)
Tax benefit	41		67		80	103
Net Income (Loss)	(77)		(191)		(152)	(318)
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)	$ 99		$ (251)		$ 161	$ (324)

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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