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Derivatives, Hedges, Financial Instruments and Carbon Credits - Net Gains (Losses) Included in Continuing Operating Results and Statement of Operations Classifications (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]        
Total net gain (losses) included in operating results $ 4,282 $ 79 $ 1,769 $ (1,603)
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 80 64 63 (1,494)
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 (7) 29 6 (64)
Other Income [Member] | Carbon Credits [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total net gain (losses) included in operating results 257 1,771 317 1,741
Other Expense [Member] | Contractual Obligations Relating to Carbon Credits [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total net gain (losses) included in operating results   (1,771) (60) (1,741)
Non-operating Other Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-operating other income - embedded derivative $ 3,952   $ 1,443  
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   $ (14)   $ (45)