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Other Expense, Income and Non-Operating Other Expense (Income), Net - Schedule of Other Income and Non-Operating Other Income, Net (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Other expense: |  |
Realized and unrealized losses on contractual obligations associated with carbon credits | $ 1,634 | $ 233
Losses on sales and disposals of property and equipment | 844 | 50
Dismantle and demolition expense |  | 1,188
Miscellaneous penalties |  | 312
Impairment on long-lived assets |  | 210
Miscellaneous expense | 105 | 37
Total other expense | 2,583 | 2,030
Other income: |  |
Realized and unrealized gains on carbon credits | 1,925 | 233
Settlements of litigation and potential litigation |  | 545
Miscellaneous income | 149 | 184
Total other income | 2,074 | 962
Other expense, net | 509 | 1,068
Non-operating other expense (income), net: |  |
Interest income | (95) | (8)
Miscellaneous expense | 18 | 24
Total non-operating other expense (income), net | $ (77) | $ 16

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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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