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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 Income, net (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Other expense:        
Dismantle and demolition expense $ 912   $ 2,100  
Miscellaneous penalties 484   796  
Realized and unrealized losses on contractual obligations associated with carbon credits 313   546  
Impairment on long-lived assets     210  
Losses on sales and disposals of property and equipment (50) 536   551
Miscellaneous expense 67 19 104 171
Total other expense 1,726 555 3,756 722
Other income:        
Realized and unrealized gains on carbon credits 313   546  
Settlements of litigation and potential litigation     545  
Gains on sales and disposals of property and equipment 179   179  
Miscellaneous income 91 112 275 348
Total other income 583 112 1,545 348
Non-operating other expense (income), net:        
Interest income (4) (24) (12) (48)
Miscellaneous income   (263)   (263)
Miscellaneous expense 12 20 36 39
Total non-operating other expense (income), net $ 8 $ (267) $ 24 $ (272)