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Derivatives, Hedges, Financial Instruments and Carbon Credits - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative $ (2,605) $ (3,308)
Foreign Exchange Contracts [Member]    
Assets - Supplies, prepaid items and other:    
Foreign exchange contracts 1  
Foreign Exchange Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets - Supplies, prepaid items and other:    
Foreign exchange contracts 1  
Recurring [Member]    
Assets - Supplies, prepaid items and other:    
Total 3 1,349
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative (2,605) (3,308)
Total (2,607) (4,796)
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets - Supplies, prepaid items and other:    
Total 3  
Liabilities - Current and noncurrent accrued and other liabilities:    
Total (2)  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative (2,605)  
Total (2,605)  
Recurring [Member] | Commodities Contracts [Member]    
Assets - Supplies, prepaid items and other:    
Commodities contracts 2 195
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities (2) (202)
Recurring [Member] | Commodities Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets - Supplies, prepaid items and other:    
Commodities contracts 2  
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities $ (2)  
Recurring [Member] | Carbon Credits [Member]    
Assets - Supplies, prepaid items and other:    
Carbon credits   1,154
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits   (1,154)
Recurring [Member] | Foreign Exchange Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities   (6)
Recurring [Member] | Interest Rate Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities   $ (126)