Fair Value Measurements - Various Instruments That Require Fair Value Measurement (Detail) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency option contracts	$ 11	$ 15
Copper derivative contracts	69	267
Interest Rate Swap Instrument designated as hedging instruments, other assets (liabilities)	(370)	(361)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency option contracts	0	0
Copper derivative contracts	0	0
Interest Rate Swap Instrument designated as hedging instruments, other assets (liabilities)	0	0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency option contracts	11	15
Copper derivative contracts	69	267
Interest Rate Swap Instrument designated as hedging instruments, other assets (liabilities)	(370)	(361)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign currency option contracts	0	0
Copper derivative contracts	0	0
Interest Rate Swap Instrument designated as hedging instruments, other assets (liabilities)	$ 0	$ 0