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Derivatives, Hedges, Financial Instruments and Carbon Credits - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Assets - Supplies, prepaid items and other:    
Total $ 4,059 $ 2,779
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 5,541 5,934
Commodities Contracts [Member]    
Assets - Supplies, prepaid items and other:    
Commodities contracts 10 0
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 1,070 2,440
Carbon Credits [Member]    
Assets - Supplies, prepaid items and other:    
Carbon credits 4,049 2,779
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits 4,049 2,779
Interest Rate Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 416 671
Foreign Exchange Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 6 $ 44
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Assets - Supplies, prepaid items and other:    
Total 0  
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 290  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Commodities Contracts [Member]    
Assets - Supplies, prepaid items and other:    
Commodities contracts 0  
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 290  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Carbon Credits [Member]    
Assets - Supplies, prepaid items and other:    
Carbon credits 0  
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest Rate Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Foreign Exchange Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 0  
Significant Other Observable Inputs (Level 2) [Member]    
Assets - Supplies, prepaid items and other:    
Total 10  
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 1,202  
Significant Other Observable Inputs (Level 2) [Member] | Commodities Contracts [Member]    
Assets - Supplies, prepaid items and other:    
Commodities contracts 10  
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 780  
Significant Other Observable Inputs (Level 2) [Member] | Carbon Credits [Member]    
Assets - Supplies, prepaid items and other:    
Carbon credits 0  
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits 0  
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 416  
Significant Other Observable Inputs (Level 2) [Member] | Foreign Exchange Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 6  
Significant Unobservable Inputs (Level 3) [Member]    
Assets - Supplies, prepaid items and other:    
Total 4,049  
Liabilities - Current and noncurrent accrued and other liabilities:    
Total 4,049  
Significant Unobservable Inputs (Level 3) [Member] | Commodities Contracts [Member]    
Assets - Supplies, prepaid items and other:    
Commodities contracts 0  
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 0  
Significant Unobservable Inputs (Level 3) [Member] | Carbon Credits [Member]    
Assets - Supplies, prepaid items and other:    
Carbon credits 4,049  
Liabilities - Current and noncurrent accrued and other liabilities:    
Contractual obligations - carbon credits 4,049  
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities 0  
Significant Unobservable Inputs (Level 3) [Member] | Foreign Exchange Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Derivative Financial Instruments, Liabilities $ 0