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Other Expense, Other Income and Non-Operating Other Expense (Income), net - Schedule of Other Expense, Other Income and Non-Operating Other Expense (Income), Net (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2013 | Sep. 30, 2012
Other expense: |  |  |  |
Dismantle and demolition expense | $ 264 |  | $ 2,364 |
Miscellaneous penalties | 10 |  | 806 |
Losses on sales and disposals of property and equipment | 677 | 116 | 677 | 667
Realized and unrealized losses on contractual obligations associated with carbon credits |  | 248 | 546 | 248
Miscellaneous expense |  | 20 | 314 | 191
Total other expense | 951 | 384 | 4,707 | 1,106
Other income: |  |  |  |
Realized and unrealized gains on carbon credits |  | 248 | 546 | 248
Settlements of litigation and potential litigation |  |  | 545 |
Gains (losses) on sales and disposals of property and equipment | (179) |  |  |
Miscellaneous income | 349 | 241 | 624 | 589
Total other income | 170 | 489 | 1,715 | 837
Non-operating other expense (income), net: |  |  |  |
Interest income | (52) | (22) | (64) | (70)
Miscellaneous income |  |  |  | (263)
Miscellaneous expense | 18 | 24 | 54 | 63
Total non-operating other expense (income), net | $ (34) | $ 2 | $ (10) | $ (270)

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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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