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		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Foreign Currency Sales Contracts [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Expected release to pre - tax earnings	$ (33)		$ (33)
Amount released to pre - tax earnings	0	0	0	0
Foreign Currency Purchase Contracts [Member]
Derivative [Line Items]
Expected release to pre - tax earnings	28		28
Amount released to pre - tax earnings	7	7	14	14
Futures Contracts - Copper and Aluminum [Member]
Derivative [Line Items]
Expected release to pre - tax earnings	35		35
Amount released to pre - tax earnings	$ (87)	$ (101)	$ (123)	$ (115)