Derivative Instruments - Summary of Change in Fair Value Reclassified or Expected to be Reclassified from Accumulated Other Comprehensive Income (Loss) to Earnings (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
Foreign Currency Sales Contracts [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Expected release to pre - tax earnings	$ 7		$ 7
Amount released to pre - tax earnings	22	0	22	0
Foreign Currency Purchase Contracts [Member]
Derivative [Line Items]
Expected release to pre - tax earnings	28		28
Amount released to pre - tax earnings	6	6	20	20
Futures Contracts - Copper and Aluminum [Member]
Derivative [Line Items]
Expected release to pre - tax earnings	(120)		(120)
Amount released to pre - tax earnings	$ (7)	$ (237)	$ (130)	$ (352)