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Other Expense, Other Income and Non-Operating Other Income, net - Schedule of Other Expense, Other Income and Non-Operating Other Income, net (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Other expense: |  |
Dismantle and demolition expense | $ 1,188 |
Miscellaneous penalties | 312 | 101
Realized and unrealized losses on contractual obligations associated with carbon credits | 233 |
Impairment on long-lived assets | 210 |
Miscellaneous expense | 87 | 66
Total other expense | 2,030 | 167
Other income: |  |
Settlements of litigation and potential litigation | 545 |
Realized and unrealized gains on carbon credits | 233 |
Miscellaneous income | 184 | 236
Total other income | 962 | 236
Non-operating other expense (income), net: |  |
Interest income | (8) | (24)
Miscellaneous expense | 24 | 19
Total non-operating other expense (income), net | $ 16 | $ (5)

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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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