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Derivatives Hedges and Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative $ (1,642) $ (2,660)
Recurring [Member]    
Assets - Supplies, prepaid items and other:    
Other 533  
Total 533  
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative (1,642) (2,660)
Other (533)  
Total (2,175) $ (2,660)
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]    
Assets - Supplies, prepaid items and other:    
Other 533  
Total 533  
Liabilities - Current and noncurrent accrued and other liabilities:    
Embedded derivative (1,642)  
Other (533)  
Total $ (2,175)