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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]        
Total net gains (losses) included in operating results $ (109) $ 4,282 $ (400) $ 1,769
Cost of Sales [Member] | Commodities Contracts [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total net gains (losses) included in operating results   80   63
Cost of Sales [Member] | Foreign Exchange Contracts [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total net gains (losses) included in operating results   (7)   6
Other Income [Member] | Carbon Credits [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total net gains (losses) included in operating results   257 867 317
Other Expense [Member] | Contractual Obligations Relating to Carbon Credits [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Total net gains (losses) included in operating results 180   (687) (60)
Non-operating Other Expense [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Non-operating other expense - embedded derivative $ (289) $ 3,952 $ (580) $ 1,443