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Summary of Significant Accounting Policies (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Accounting Policies [Abstract]        
Impact of voyage proration change $ 16,300,000   $ 16,300,000  
Gross amount of port costs included in passenger ticket revenues $ 232,700,000 $ 135,800,000 $ 494,500,000 $ 368,500,000