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Derivatives, Hedges, Financial Instruments and Carbon Credits - Net Gains (Losses) Included in Operating Results and Statement of Operations Classifications (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in operating results $ (306) $ (3,111) $ (777)
Cost of Sales [Member] | Commodities Contracts [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in operating results 140 (3,376) (947)
Cost of Sales [Member] | Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in operating results 5 (72) (49)
Other Income [Member] | Carbon Credits [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in operating results 1,514 3,663 3,089
Other Expense [Member] | Contractual Obligations Relating to Carbon Credits [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in operating results (982) (2,759) (2,799)
Non-operating Other Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Non-operating other expense - embedded derivative $ (983) (520)  
Interest Expense [Member] | Interest Rate Contracts [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in operating results   $ (47) $ (71)