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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, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Other expense: |  |  |  |
Realized and unrealized losses on contractual obligations associated with carbon credits |  |  | $ 1,634 | $ 546
Losses on sales and disposals of property and equipment | 406 | 677 | 1,414 | 677
Dismantle and demolition expense |  | 264 | 559 | 2,364
Miscellaneous penalties | 3 | 10 | 6 | 806
Miscellaneous expense | 58 |  | 181 | 314
Total other expense | 467 | 951 | 3,794 | 4,707
Other income: |  |  |  |
Realized and unrealized gains on carbon credits |  |  | 1,925 | 546
Settlements of litigation and potential litigation |  |  |  | 545
Gain (losses) on sales and disposals of property and equipment |  | (179) |  |
Miscellaneous income | 162 | 349 | 451 | 624
Total other income | 162 | 170 | 2,376 | 1,715
Other expense, net | 305 | 781 | 1,418 | 2,992
Non-operating other expense (income), net: |  |  |  |
Interest income | (88) | (52) | (262) | (64)
Miscellaneous income |  |  |  |
Miscellaneous expense | (1) | 18 | 20 | 54
Total non-operating other income, net | $ (89) | $ (34) | $ (242) | $ (10)

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- Definition Gains recognized (realized and/or unrealized) from sales of carbon credits occurring during the reporting period. + References No definition available. + Details
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- Definition Losses incurred (realized and/or unrealized) from contractual obligations related to carbon credits during the reporting period. + References No definition available. + Details
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