Derivative Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Customer	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Anticipated foreign-denominated sales hedge	$ 21,714
Foreign-denominated sales cash flow contracts	0
Fair value of assets held as collateral related to futures	400
Percentage of purchase commitments covering anticipated natural gas usage	53.00%
Purchase commitment amount of anticipated natural gas usage	4,329
Number of subsidiaries purchased commitments for natural gas usage	1
Purchase commitments covering period usage, years	2 years
(Losses) gains on foreign exchange transactions included in other income (expense)	(227)	107	(371)
Foreign Currency Sales Contract - Fair Value Hedges [Member]
Derivative [Line Items]
Fair value of assets held as collateral related to forward exchange contracts	828
Copper Purchases [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	57.00%
Time period for hedged purchases	9 months
Copper Purchases [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Anticipated purchases, hedged	2,970
Aluminum Purchases [Member]
Derivative [Line Items]
Percentage of anticipated purchases hedged	38.00%
Time period for hedged purchases	6 months
Aluminum Purchases [Member] | Cash Flow Hedges [Member]
Derivative [Line Items]
Anticipated purchases, hedged	$ 463