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Equity Accounted Investments - Condensed Summary of Company's Financial Information for Joint Venture (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]      
Income from vessel operations $ (150,393) $ 108,412 $ 234,123
Joint Venture [Member]
      
Schedule of Equity Method Investments [Line Items]      
REVENUES 659,030 303,607 232,516
Income from vessel operations 241,702 118,408 91,290
Realized and unrealized loss on derivative instruments (56,307) (127,230) (95,750)
Net income (loss) 120,395 (48,996) (44,794)
Joint Venture [Member] | Cash and restricted cash [Member]
      
Schedule of Equity Method Investments [Line Items]      
Cash and restricted cash 229,963 184,296  
Joint Venture [Member] | Other assets - current [Member]
      
Schedule of Equity Method Investments [Line Items]      
Cash and restricted cash 125,152 105,925  
Joint Venture [Member] | Vessels and Equipment [Member]
      
Schedule of Equity Method Investments [Line Items]      
Net investment in direct financing leases 2,114,435 462,335  
Joint Venture [Member] | Net investment in direct financing leases [Member]
      
Schedule of Equity Method Investments [Line Items]      
Net investment in direct financing leases 1,938,011 1,728,902  
Joint Venture [Member] | Other assets - non - current [Member]
      
Schedule of Equity Method Investments [Line Items]      
Net investment in direct financing leases 228,887 188,384  
Joint Venture [Member] | Current portion of long-term debt [Member]
      
Schedule of Equity Method Investments [Line Items]      
Current portion of long-term debt 1,106,706 106,584  
Joint Venture [Member] | Other liabilities - current [Member]
      
Schedule of Equity Method Investments [Line Items]      
Current portion of long-term debt 193,785 138,945  
Joint Venture [Member] | Long-term debt [Member]
      
Schedule of Equity Method Investments [Line Items]      
Long-term debt 1,911,419 1,567,215  
Joint Venture [Member] | Other liabilities - non-current [Member]
      
Schedule of Equity Method Investments [Line Items]      
Long-term debt $ 469,220 $ 395,750