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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Foreign Currency Sales Contracts - Cash Flow Hedges [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Expected release to pre - tax earnings	$ 0		$ 0
Amount released to pre - tax earnings	0	0	0	79
Foreign Currency Purchases 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	(532)		(532)
Amount released to pre - tax earnings	$ (101)	$ 38	$ (115)	$ (246)