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		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Period	$ 273	$ (49)	$ 313	$ 318
Recognized as Comprehensive Income (Loss)	(72)	152	(180)	(277)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	13	(144)	(55)	(206)
Comprehensive Income (Loss) End of the Period	188	247	188	247
Foreign Currency Sales Contracts [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Period	(21)	0	0	0
Recognized as Comprehensive Income (Loss)	31	0	10	0
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	13	0	13	0
Comprehensive Income (Loss) End of the Period	(3)	0	(3)	0
Foreign Currency Purchase Contracts [Member]
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Period	265	282	275	292
Recognized as Comprehensive Income (Loss)	0	0	0	0
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	3	4	13	14
Comprehensive Income (Loss) End of the Period	262	278	262	278
Futures Contracts - Copper and Aluminum [Member]
Derivative [Line Items]
Comprehensive Income (Loss) Beginning of the Period	29	(331)	38	26
Recognized as Comprehensive Income (Loss)	(103)	152	(190)	(277)
Gain (Loss) Reclassified from Accumulated Other Comprehensive Loss	(3)	(148)	(81)	(220)
Comprehensive Income (Loss) End of the Period	$ (71)	$ (31)	$ (71)	$ (31)