Accumulated Other Comprehensive Loss - Line Items Affected on Condensed Consolidated Statements of Operations for Components Reclassified from Accumulated Other Comprehensive 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]
Costs of products sold (excluding depreciation)									$ 218,597	$ 217,342	$ 225,906
Selling and administrative									37,380	39,682	40,530
Other income (expense)									907	1,631	942
Income tax provision									(766)	5,813	5,218
Net (loss) income	2,043	343	(1,121)	(78)	1,500	(12,705)	(1,106)	(126)	1,187	(12,437)	(8,355)
Net sales (foreign currency sales contracts)	(74,587)	(65,409)	(69,949)	(62,913)	(77,055)	(64,433)	(69,938)	(69,624)	(272,858)	(281,050)	(292,905)
Depreciation (foreign currency purchase contracts)									11,818	11,342	10,661
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Amortization of Unrecognized Employee Benefit Costs [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Costs of products sold (excluding depreciation)									3,601	5,691	4,807
Selling and administrative									1,524	2,241	1,939
Other income (expense)									174	867	763
Total before income tax									5,299	8,799	7,509
Income tax provision									(1,841)	(3,156)	(3,547)
Net (loss) income									3,458	5,643	3,962
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Realized (Gains) from Sale of Marketable Securities [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Selling and administrative									(171)	(87)	(120)
Income tax provision									60	30	42
Net (loss) income									(111)	(57)	(78)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Realized (Gains) Losses from Settlement of Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before income tax									152	392	174
Income tax provision									(57)	(146)	(67)
Net (loss) income									95	246	107
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Realized (Gains) Losses from Settlement of Cash Flow Hedges [Member] | Foreign Currency Sales Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net sales (foreign currency sales contracts)									33	0	(197)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Realized (Gains) Losses from Settlement of Cash Flow Hedges [Member] | Foreign Currency Purchase Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Depreciation (foreign currency purchase contracts)									(27)	(27)	(27)
Reclassification Out of Accumulated Other Comprehensive Income (Loss) [Member] | Realized (Gains) Losses from Settlement of Cash Flow Hedges [Member] | Futures Contracts - Copper and Aluminum [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Costs of products sold (excluding depreciation)									$ 146	$ 419	$ 398