The Effect and Fair Value of Derivative Instruments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
Foreign Exchange Option Contracts
Derivative [Line Items]
Foreign exchange option contracts not designated as hedging instruments, amount of gain (loss)	$ 81
Foreign exchange option contracts not designated as hedging instruments, fair value	1
Copper Derivative Instruments
Derivative [Line Items]
Copper derivative instruments contracts designated as hedging instruments, amount of gain (loss)	(15)
Copper derivative instruments designated as hedging instruments	$ (21)