Summary of Significant Accounting Policies (Passenger Ticket Revenues) (Details)	12 Months Ended
	Dec. 31, 2016 brand segment	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Number of cruise brands wholly owned | brand	3
Investment in a joint venture, percentage of interest	50.00%
Number of operating segments | segment	1
United States
Passengers ticket revenue, percentage
Passengers ticket revenue, percentage	55.00%	55.00%	53.00%
All other countries
Passengers ticket revenue, percentage
Passengers ticket revenue, percentage	45.00%	45.00%	47.00%
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%