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Derivatives, Hedges, Financial Instruments and Carbon Credits - Net Gains (Losses) Included in Continuing Operating Results and the Statement of Operations Classifications (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in continuing operating results $ (3,111) $ (777) $ (2)
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 continuing operating results (3,376) (947) 31
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 continuing operating results (72) (49)  
Other Income [Member] | Carbon Credits [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in continuing operating results 3,663 3,089 1,233
Other Expense [Member] | Contractual Obligations Relating to Carbon Credits [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Total net gain (losses) included in continuing operating results (2,759) (2,799) (1,233)
Non-operating Other Expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Non-operating other expense - embedded derivative (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 continuing operating results $ (47) $ (71) $ (33)