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Contractual Amounts Due under Leases (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Receivables [Abstract]    
Due within one year $ 91,116  
Due within two years 64,952  
Due within three years 55,644  
Thereafter 682  
Total 212,394 328,800
Less amounts representing interest (6,681)  
Present value 205,713  
Current portion (included in accounts and notes receivable) 89,050  
Long-term portion (included in other assets, net) $ 116,663