The aggregate cost of goods produced and sold and services rendered during the reporting period.

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Accumulated Other Comprehensive Loss - Schedule of Reclassifications of Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of Sales									$ (362,722)us-gaap_CostOfRevenue	$ (299,209)us-gaap_CostOfRevenue	$ (329,794)us-gaap_CostOfRevenue
Tax (expense) benefit									(4,651)us-gaap_IncomeTaxExpenseBenefit	(12,358)us-gaap_IncomeTaxExpenseBenefit	(8,388)us-gaap_IncomeTaxExpenseBenefit
Net Income (loss)	(13,996)us-gaap_NetIncomeLoss	5,021us-gaap_NetIncomeLoss	3,192us-gaap_NetIncomeLoss	(12,104)us-gaap_NetIncomeLoss	(17,006)us-gaap_NetIncomeLoss	1,016us-gaap_NetIncomeLoss	5,561us-gaap_NetIncomeLoss	9,506us-gaap_NetIncomeLoss	(17,887)us-gaap_NetIncomeLoss	(923)us-gaap_NetIncomeLoss	16,244us-gaap_NetIncomeLoss
Net sales	102,158us-gaap_SalesRevenueNet	116,505us-gaap_SalesRevenueNet	101,988us-gaap_SalesRevenueNet	82,647us-gaap_SalesRevenueNet	85,641us-gaap_SalesRevenueNet	78,527us-gaap_SalesRevenueNet	87,942us-gaap_SalesRevenueNet	107,335us-gaap_SalesRevenueNet	403,298us-gaap_SalesRevenueNet	359,445us-gaap_SalesRevenueNet	388,902us-gaap_SalesRevenueNet
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income (loss)									(112)	(167)	(334)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member] \| Defined Benefit Pension Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income (loss)									(114)	(239)	(313)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member] \| Defined Benefit Pension Items [Member] \| Net Periodic Pension Cost [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Cost of Sales									(182)	(372)	(417)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member] \| Defined Benefit Pension Items [Member] \| Associated Tax Expense Benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax (expense) benefit									68	133	104
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member] \| Gains (Losses) on Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net Income (loss)									2	72	(21)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member] \| Gains (Losses) on Cash Flow Hedges [Member] \| Associated Tax Expense Benefit [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Tax (expense) benefit									(1)	(42)	19
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member] \| Gains (Losses) on Cash Flow Hedges [Member] \| Gain on Cash Flow Derivative [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales									6	114	(40)
Amount Reclassified from Accumulated Other Comprehensive Income (Loss) [Member] \| Gains (Losses) on Cash Flow Hedges [Member] \| Hedge ineffectiveness [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales									$ (3)