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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, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Cost of sales	$ (78,052)	$ (100,047)	$ (159,125)	$ (196,617)
Income (Loss) Before Provision for Income Taxes	(11,259)	17,869	(26,004)	26,214
Tax (expense) benefit	3,589	(5,468)	7,520	(7,162)
Total reclassifications for the period, net of tax	(7,670)	12,401	(18,484)	19,052
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	(7)	(124)	(97)	(204)
Income (Loss) Before Provision for Income Taxes	(258)	1,113	(421)	1,502
Tax (expense) benefit	67	(504)	103	(663)
Total reclassifications for the period, net of tax	(191)	609	(318)	839
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 realized investment gain	$ (251)	1,393	$ (324)	1,965
Impairment Expense [Member] | Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment Out of Accumulated Other Comprehensive Income (Loss) [Line Items]
Net realized investment gain		(2)		(105)
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		$ (154)		$ (154)

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