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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
Jun. 30, 2016
Dec. 31, 2015
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative $ (1,865) $ (3,308)
Recurring [Member]    
Assets - Supplies, prepaid items and other:    
Total 42 1,349
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative (1,865) (3,308)
Total (1,907) (4,796)
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets - Supplies, prepaid items and other:    
Total 36  
Liabilities - Current and noncurrent accrued and other liabilities:    
Total (36)  
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Assets - Supplies, prepaid items and other:    
Total 6  
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative (1,865)  
Total (1,871)  
Recurring [Member] | Commodities Contracts [Member]    
Assets - Supplies, prepaid items and other:    
Commodities contracts 36 195
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities (36) (202)
Recurring [Member] | Commodities Contracts [Member] | Significant Other Observable Inputs (Level 2) [Member]    
Assets - Supplies, prepaid items and other:    
Commodities contracts 36  
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities (36)  
Recurring [Member] | Carbon Credits [Member]    
Assets - Supplies, prepaid items and other:    
Carbon credits 6 1,154
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits (6) (1,154)
Recurring [Member] | Carbon Credits [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Assets - Supplies, prepaid items and other:    
Carbon credits 6  
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits $ (6)  
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)