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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
Dec. 31, 2016
Dec. 31, 2015
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative $ 2,557 $ 3,308
Recurring [Member]    
Assets - Supplies, prepaid items and other:    
Total   1,349
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative 2,557 3,308
Total 2,558 4,796
Recurring [Member] | Commodities Contracts [Member]    
Assets - Supplies, prepaid items and other:    
Commodities contracts   195
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities   202
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] | Interest Rate Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities   126
Recurring [Member] | Foreign Exchange Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 1 $ 6
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 1  
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 1  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative 2,557  
Total $ 2,557