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Derivatives, Hedges, Financial Instruments and Carbon Credits - Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative $ (2,660) $ (2,557)
Recurring [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative (2,660) (2,557)
Total (2,660) (2,558)
Recurring [Member] | Foreign Exchange Contracts [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Foreign exchange contracts   $ (1)
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative (2,660)  
Total $ (2,660)