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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 1,312 737
Dismantle and demolition expense   559 2,578
Miscellaneous penalties 137 18 824
Miscellaneous expense 688 197 302
Total other expense 3,595 4,885 5,674
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 890 676 545
Total other income 4,864 3,765 2,323
Other expense (income), net (1,269) 1,120 3,351
Non-operating other expense (income), net:      
Interest income (396) (301) (165)
Miscellaneous income     (1)
Loss on embedded derivative and other expense 520 20 66
Total non-operating other income, net $ 124 $ (281) $ (100)