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Derivative Instruments - Fair Value Amounts of Derivative Instruments (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Derivatives, Fair Value [Line Items]    
Accounts receivable $ 4,567 $ 4,344
Current portion of derivative assets 17,212 15,608
Derivative assets 145,347 139,651
Accrued liabilities (10,887) (11,448)
Current portion of derivative liabilities (48,046) (43,973)
Derivative liabilities (248,249) (249,245)
Interest rate swap agreements [Member]
   
Derivatives, Fair Value [Line Items]    
Accounts receivable 4,513 4,344
Current portion of derivative assets 16,927 15,608
Derivative assets 144,247 139,651
Accrued liabilities (10,887) (11,448)
Current portion of derivative liabilities (48,046) (43,973)
Derivative liabilities (245,287) (248,645)
Currency swap [Member]
   
Derivatives, Fair Value [Line Items]    
Accounts receivable 54  
Current portion of derivative assets 285  
Derivative assets     
Accrued liabilities     
Current portion of derivative liabilities     
Derivative liabilities (2,962)  
Toledo Spirit time-charter derivative [Member]
   
Derivatives, Fair Value [Line Items]    
Accounts receivable      
Current portion of derivative assets      
Derivative assets 1,100   
Accrued liabilities      
Current portion of derivative liabilities      
Derivative liabilities    $ (600)