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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, 2015
Dec. 31, 2014
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative $ 3,308  
Recurring [Member]    
Assets - Supplies, prepaid items and other:    
Total 1,349 $ 2,779
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative 3,308  
Total 4,796 5,663
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 2,169
Recurring [Member] | Carbon Credits [Member]    
Assets - Supplies, prepaid items and other:    
Carbon credits 1,154 2,779
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits 1,154 2,779
Recurring [Member] | Interest Rate Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 126 671
Recurring [Member] | Foreign Exchange Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 6 $ 44
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member]    
Assets - Supplies, prepaid items and other:    
Total 195  
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative 3,308  
Total 3,642  
Significant Other Observable Inputs (Level 2) [Member] | 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  
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Interest Rate Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 126  
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Foreign Exchange Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 6  
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member]    
Assets - Supplies, prepaid items and other:    
Total 1,154  
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 1,154  
Significant Unobservable Inputs (Level 3) [Member] | 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