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Derivatives, Hedges, Financial Instruments and Carbon Credits - Net Gains (Losses) Included in Earnings and Income Statement Classifications (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in earnings $ (277) $ (373) $ (2,251)
Cost of sales [Member] | Commodities contracts [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in earnings (244) 14 (523)
Cost of sales [Member] | Foreign exchange contracts [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in earnings   (19) 46
Other income [Member] | Carbon credits [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in earnings 1,233 876 1,995
Other expense [Member] | Contractual obligations relating to carbon credits [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in earnings (1,233) (721) (1,844)
Interest expense [Member] | Interest rate contracts [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in earnings $ (33) $ (523) $ (1,925)