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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	$ (81,887)	$ (98,621)	$ (241,012)	$ (295,238)
Income (Loss) Before Provision for Income Taxes	3,220	19,207	(22,784)	45,421
Tax (expense) benefit	4,369	(3,309)	11,889	(10,471)
Total reclassifications for the period, net of tax	7,589	15,898	(10,895)	34,950
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	(54)	(106)	(151)	(310)
Income (Loss) Before Provision for Income Taxes	1,622	518	1,201	2,020
Tax (expense) benefit	(419)	(244)	(316)	(907)
Total reclassifications for the period, net of tax	1,203	274	885	1,113
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	$ 1,676	1,066	$ 1,352	3,031
Impairment Expense [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Net investment gain		(57)		(162)
Net Losses on Derivatives Designated as Hedging Instruments [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales		$ (385)		$ (539)

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