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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, 2015
Dec. 31, 2014
Dec. 31, 2013
Other expense:      
Realized and unrealized losses on contractual obligations associated with carbon credits $ 2,759 $ 2,799 $ 1,233
Losses on sales and disposals of property and equipment 11 1,327 728
Dismantle and demolition expense   559 2,578
Miscellaneous penalties 130 10 818
Miscellaneous expense 493 14 257
Total other expense 3,393 4,709 5,614
Other income:      
Realized and unrealized gains on carbon credits 3,663 3,089 1,233
Settlements of litigation and potential litigation 311   545
Miscellaneous income 1,206 576 312
Total other income 5,180 3,665 2,090
Other expense (income), net (1,787) 1,044 3,524
Non-operating other expense (income), net:      
Interest income (391) (301) (42)
Miscellaneous income     (1)
Loss on embedded derivative and other expense 520 20 66
Total non-operating other expense (income), net $ 129 $ (281) $ 23