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Property and Equipment, Net - Asset Retirement Obligation (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Asset Retirement Obligation Disclosure [Abstract]    
Asset retirement obligations included in accrued expenses and other current liabilities $ 6,600,000 $ 3,900,000
Asset retirement obligations included in other long-term liabilities 20,000,000 19,300,000
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]    
Beginning balance 23,208,000 22,900,000
Asset Retirement Obligation, Revision of Estimate 2,810,000 (943,000)
Liabilities incurred 154,000 471,000
Liabilities settled (885,000) (496,000)
Accretion 1,289,000 1,276,000
Ending balance $ 26,576,000 $ 23,208,000