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Summary of Significant Accounting Policies (Passenger Ticket Revenues) (Details)
12 Months Ended
Dec. 31, 2017
brand
segment
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Information [Line Items]      
Number of cruise brands wholly owned | brand 3    
Number of operating segments | segment 1    
United States      
Passengers ticket revenue, percentage      
Passengers ticket revenue, percentage 59.00% 55.00% 55.00%
All other countries      
Passengers ticket revenue, percentage      
Passengers ticket revenue, percentage 41.00% 45.00% 45.00%
TUI Cruises      
Segment Reporting Information [Line Items]      
Investment in a joint venture, percentage of interest 50.00%    
Pullmantur and CDF Croisieres De France      
Segment Reporting Information [Line Items]      
Investment in a joint venture, percentage of interest 49.00%    
SkySea Cruises      
Segment Reporting Information [Line Items]      
Investment in a joint venture, percentage of interest 36.00%