Derivative Instruments - Summary of Amount Recognized as and Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Year	$ 313	$ 318	$ 109
Plus Recognized as Comprehensive Income (Loss)	(323)	(251)	102
Less Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	(95)	(246)	(107)
Comprehensive Income (Loss) End of the Year	85	313	318
Foreign Currency Sales Contracts [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Year	0	0	114
Plus Recognized as Comprehensive Income (Loss)	(21)	0	10
Less Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	(21)	0	124
Comprehensive Income (Loss) End of the Year	0	0	0
Foreign Currency Purchase Contracts [Member]
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Year	275	292	309
Plus Recognized as Comprehensive Income (Loss)	0	0	0
Less Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	17	17	17
Comprehensive Income (Loss) End of the Year	258	275	292
Futures Contracts - Copper and Aluminum [Member]
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Year	38	26	(314)
Plus Recognized as Comprehensive Income (Loss)	(302)	(251)	92
Less Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	(91)	(263)	(248)
Comprehensive Income (Loss) End of the Year	$ (173)	$ 38	$ 26