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Equity Method Investments - Financial Information of Joint Ventures (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]      
Vessels and equipment $ 1,949,640 $ 2,021,125  
Net investments in direct financing leases - non-current 403,386 409,541  
Current portion of long-term debt 86,489 84,722  
Long-term debt 1,413,353 1,315,231  
Other liabilities - non-current 73,568 76,096  
Voyage revenues 392,251 379,975 374,008
Income from vessel operations 147,791 173,503 178,960
Realized and unrealized loss on derivative instruments (29,620) (63,030) (78,720)
Net income 139,142 97,356 92,944
Equity method investments [Member]
      
Schedule of Equity Method Investments [Line Items]      
Cash and restricted cash 155,943 94,508  
Other assets - current 57,868 34,100  
Vessels and equipment 1,653,273 226,794  
Net investments in direct financing leases - non-current 1,938,011 1,728,702  
Other assets - non-current 180,898 165,912  
Current portion of long-term debt 1,075,853 71,073  
Other liabilities - current 122,702 69,826  
Long-term debt 1,603,118 1,483,675  
Other liabilities - non-current 446,733 315,271  
Voyage revenues 412,974 167,094 106,371
Income from vessel operations 278,067 124,553 83,992
Realized and unrealized loss on derivative instruments (39,428) (41,622) (35,173)
Net income $ 180,059 $ 51,492 $ 20,092