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Other Income, Expense and Non-Operating Other Income, net - Schedule of Other Income and Non-Operating Other Income, Net (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Other income: |  |  |
Realized and unrealized gains on carbon credits | $ 1,233 | $ 876 | $ 1,995
Settlements of litigation and potential litigation | 545 | 2,303 | 1,562
Miscellaneous income | 545 | 632 | 381
Total other income | 2,323 | 3,811 | 3,938
Other expense: |  |  |
Dismantle and demolition expense | 2,578 |  |
Realized and unrealized losses on contractual obligations associated with carbon credits | 1,233 | 721 | 1,844
Miscellaneous penalties | 824 | 112 | 168
Losses on sales and disposals of property and equipment | 737 | 996 | 1,280
Miscellaneous expense | 302 | 289 | 531
Total other expense | 5,674 | 2,118 | 3,823
Other income (expense), net | (3,351) | 1,693 | 115
Non-operating other income, net: |  |  |
Interest income | 165 | 87 | 77
Miscellaneous income | 1 | 263 |
Miscellaneous expense | (66) | (69) | (77)
Total non-operating other income, net | $ 100 | $ 281 |

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