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Other Expense, Income and Non-Operating Other Income, Net - Schedule of Other Income and Non-Operating Other Income, Net (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Other expense:      
Realized and unrealized losses on contractual obligations associated with carbon credits $ 982 $ 2,759 $ 2,799
Losses on sales and disposals of property and equipment 355 11 1,327
Miscellaneous expense 353 623 583
Total other expense 1,690 3,393 4,709
Other income:      
Realized and unrealized gains on carbon credits 1,514 3,663 3,089
Miscellaneous income 1,048 1,517 576
Total other income 2,562 5,180 3,665
Other expense (income), net (872) (1,787) 1,044
Non-operating other expense (income), net:      
Interest and miscellaneous income (765) (391) (301)
Loss on embedded derivative and other expense 983 520 20
Total non-operating other expense (income), net $ 218 $ 129 $ (281)