Basis of Presentation and General Information (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Sep. 18, 2009
Oct. 14, 2014
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Nov. 21, 2013
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Jun. 25, 2013
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May 14, 2013
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Basis of Presentation and General Information              
Common stock, authorized capital stock (in shares) 750,000,000 750,000,000 750,000,000        
Common stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01        
Preferred stock, authorized capital stock (in shares) 100,000,000 100,000,000 100,000,000        
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01 $ 0.01        
Hyundai Together              
Basis of Presentation and General Information              
TEU 13,100            
Hyundai Tenacity              
Basis of Presentation and General Information              
TEU 13,100            
Hyundai Smart              
Basis of Presentation and General Information              
TEU 13,100            
Hyundai Speed              
Basis of Presentation and General Information              
TEU 13,100            
Hyundai Ambition              
Basis of Presentation and General Information              
TEU 13,100            
Hanjin Germany              
Basis of Presentation and General Information              
TEU 10,100            
Hanjin Italy              
Basis of Presentation and General Information              
TEU 10,100            
Hanjin Greece              
Basis of Presentation and General Information              
TEU 10,100            
CSCL Pusan              
Basis of Presentation and General Information              
TEU 9,580            
CSCL Le Havre              
Basis of Presentation and General Information              
TEU 9,580            
CMA CGM Melisande              
Basis of Presentation and General Information              
TEU 8,530            
CMA CGM Attila              
Basis of Presentation and General Information              
TEU 8,530            
CMA CGM Tancredi              
Basis of Presentation and General Information              
TEU 8,530            
CMA CGM Bianca              
Basis of Presentation and General Information              
TEU 8,530            
CMA CGM Samson              
Basis of Presentation and General Information              
TEU 8,530            
CSCL Europe              
Basis of Presentation and General Information              
TEU 8,468            
CSCL America              
Basis of Presentation and General Information              
TEU 8,468            
CMA CGM Moliere, Musset, Nerval, Rabelais and Racine              
Basis of Presentation and General Information              
Period of charter term after which option to purchase vessel is available to charterer 8 years            
Consideration for which vessel can be purchased by charterer $ 78.0            
CMA CGM Musset              
Basis of Presentation and General Information              
TEU 6,500            
CMA CGM Nerval              
Basis of Presentation and General Information              
TEU 6,500            
CMA CGM Rabelais              
Basis of Presentation and General Information              
TEU 6,500            
CMA CGM Racine              
Basis of Presentation and General Information              
TEU 6,500            
CMA CGM Moliere              
Basis of Presentation and General Information              
TEU 6,500            
YM Mandate              
Basis of Presentation and General Information              
TEU 6,500            
YM Maturity              
Basis of Presentation and General Information              
TEU 6,500            
MOL Performance              
Basis of Presentation and General Information              
TEU 6,402     6,402      
MOL Priority              
Basis of Presentation and General Information              
TEU 6,402     6,402      
Hyundai Federal              
Basis of Presentation and General Information              
TEU 4,651            
SNL Colombo              
Basis of Presentation and General Information              
TEU 4,300            
YM Singapore              
Basis of Presentation and General Information              
TEU 4,300            
Zim Monaco              
Basis of Presentation and General Information              
TEU 4,253            
OOCL Novorossiysk              
Basis of Presentation and General Information              
TEU 4,253            
Zim Luanda              
Basis of Presentation and General Information              
TEU 4,253            
Zim Rio Grande              
Basis of Presentation and General Information              
TEU 4,253            
Zim Sao Paolo              
Basis of Presentation and General Information              
TEU 4,253            
OOCL Istanbul              
Basis of Presentation and General Information              
TEU 4,253            
YM Seattle              
Basis of Presentation and General Information              
TEU 4,253            
YM Vancouver              
Basis of Presentation and General Information              
TEU 4,253            
Deva              
Basis of Presentation and General Information              
TEU 4,253            
Derby D              
Basis of Presentation and General Information              
TEU 4,253            
Dimitris C              
Basis of Presentation and General Information              
TEU 3,430       3,430    
Hanjin Algeciras              
Basis of Presentation and General Information              
TEU 3,400            
Hanjin Constantza              
Basis of Presentation and General Information              
TEU 3,400            
Hanjin Buenos Aires              
Basis of Presentation and General Information              
TEU 3,400            
Hanjin Santos              
Basis of Presentation and General Information              
TEU 3,400            
Hanjin Versailles              
Basis of Presentation and General Information              
TEU 3,400            
MSC Zebra              
Basis of Presentation and General Information              
TEU 2,602         2,602  
Amalia C              
Basis of Presentation and General Information              
TEU 2,452           2,452
Niledutch Palanca              
Basis of Presentation and General Information              
TEU 2,524            
Hyundai Highway              
Basis of Presentation and General Information              
TEU 2,200            
Hyundai Progress              
Basis of Presentation and General Information              
TEU 2,200            
Hyundai Bridge              
Basis of Presentation and General Information              
TEU 2,200            
Hyundai Vladivostok              
Basis of Presentation and General Information              
TEU 2,200            
Hyundai Advance              
Basis of Presentation and General Information              
TEU 2,200            
Hyundai Stride              
Basis of Presentation and General Information              
TEU 2,200            
Hyundai Future              
Basis of Presentation and General Information              
TEU 2,200            
Hyundai Sprinter              
Basis of Presentation and General Information              
TEU 2,200            
Marathonas              
Basis of Presentation and General Information              
TEU 4,814            
Messologi              
Basis of Presentation and General Information              
TEU 4,814            
Mytilini              
Basis of Presentation and General Information              
TEU 4,814            
Duka              
Basis of Presentation and General Information              
TEU 4,651            
Commodore              
Basis of Presentation and General Information              
TEU 4,651