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Derivatives and Other Financial Instruments - Schedule of Fair Value Gains and Losses on Derivatives Contracts Recorded in Earnings (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ (20) | $ 18 | $ (21) | $ 12
Aluminum Contracts [Member] | Sales [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives |  | 1 | (4) | (6)
Aluminum Contracts [Member] | Other Expenses (Income), Net [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | (11) | 4 | (12) | 19
Embedded Credit Derivative [Member] | Other Expenses (Income), Net [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | (10) | 11 | (3) | 2
Foreign Exchange Contracts [Member] | Other Expenses (Income), Net [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Amount of Gain or (Loss) Recognized in Earnings on Derivatives | $ 1 | $ 2 | $ (2) | $ (3)

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- Definition The aggregate net gain (loss) on price risk derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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