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	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Costs of products sold (excluding depreciation)	$ 48,197	$ 55,408	$ 100,241	$ 105,471
Selling and administrative	9,175	9,469	18,571	18,475
Other income (expense)	(181)	77	185	(51)
Income tax provision	(233)	575	(193)	951
Net income	520	(1,121)	448	(1,199)
Net sales (foreign currency sales contracts)	(59,973)	(69,949)	(125,060)	(132,862)
Depreciation (foreign currency purchase contracts)	3,089	3,008	6,231	6,066
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)	498	895	1,779	1,908
Selling and administrative	798	336	2,393	735
Other income (expense)	128	27	170	84
Total before income tax	1,424	1,258	4,342	2,727
Income tax provision	(462)	(430)	(1,506)	(942)
Net income	962	828	2,836	1,785
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	(2)	(26)	(2)	(54)
Income tax provision	1	9	1	19
Net income	(1)	(17)	(1)	(35)
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	163	80	350	109
Income tax provision	(63)	(30)	(135)	(41)
Net income	100	50	215	68
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)	(6)	(7)	(13)	(14)
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)	176	87	370	123
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)	$ (7)	$ 0	$ (7)	$ 0