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Contractual Amounts Due under Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Receivables [Abstract]    
Due within one year $ 154,858  
Due within two years 98,920  
Due within three years 88,997  
Thereafter 1,524  
Total 344,299 335,500
Less amounts representing interest (9,049)  
Present value 335,250  
Current portion (included in accounts and notes receivable) 153,013  
Long-term portion (included in other assets, net) $ 182,237