Derivative Instruments - Summary of Amount Recognized as and Reclassified from Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Year	$ 313	$ 318
Recognized as Comprehensive Income (Loss)	(208)	(193)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss)	(18)	(3)
Comprehensive Income (Loss) End of the Period	123	128
Foreign Currency Purchase Contracts [Member]
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Year	275	292
Recognized as Comprehensive Income (Loss)	0	0
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss)	5	5
Comprehensive Income (Loss) End of the Period	270	287
Futures Contracts - Copper and Aluminum [Member]
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Year	38	26
Recognized as Comprehensive Income (Loss)	(208)	(193)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss)	(23)	(8)
Comprehensive Income (Loss) End of the Period	$ (147)	$ (159)