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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)