Hedging Transactions and Derivative Financial Instruments - Effect and Fair Value of Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Foreign Exchange Contract [Member]
Derivative [Line Items]
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments	$ 5	$ 81
Copper Derivative Instruments [Member]
Derivative [Line Items]
Copper Derivative Instruments not designated as hedging instruments, amount of gain (loss)	(183)	255
Interest Rate Swap Instrument [Member]
Derivative [Line Items]
Interest Rate Swap Instrument designated as hedging instruments, amoint of gain (loss)	$ (9)