Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Total revenues		$ 2,027,756	$ 2,008,560
Cruise Itinerary
Disaggregation of Revenue [Line Items]
Total revenues		1,957,424	1,943,257
Cruise Itinerary | North America
Disaggregation of Revenue [Line Items]
Total revenues	[1]	1,347,260	1,352,169
Cruise Itinerary | Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenues	[2]	532,979	525,856
Cruise Itinerary | Europe
Disaggregation of Revenue [Line Items]
Total revenues	[3]	0	0
Cruise Itinerary | Other regions
Disaggregation of Revenue [Line Items]
Total revenues		77,185	65,232
Other Revenues
Disaggregation of Revenue [Line Items]
Total revenues	[4]	70,332	65,303
Onboard Revenues
Disaggregation of Revenue [Line Items]
Total revenues		47,400	42,600
Bareboat Charter, Procurement And Management
Disaggregation of Revenue [Line Items]
Total revenues		$ 23,000	$ 21,800
Passenger Ticket | Other regions
Disaggregation of Revenue [Line Items]
Percentage of Total Revenues by Country	[5]	27.00%	28.00%
Passenger Ticket | United States
Disaggregation of Revenue [Line Items]
Percentage of Total Revenues by Country		60.00%	60.00%
Passenger Ticket | Australia
Disaggregation of Revenue [Line Items]
Percentage of Total Revenues by Country		13.00%	12.00%

[1] Includes the United States, Canada, Mexico and the Caribbean.

[2] Includes Southeast Asia (e.g., Singapore, Thailand and the Philippines), East Asia (e.g., China and Japan), South Asia (e.g., India and Pakistan) and Oceania (e.g., Australia and Fiji Islands) regions.

[3] Includes European countries (e.g., Nordics, Germany, France, Italy, Spain and the United Kingdom). During the quarters ended March 31, 2018 and 2017, there were no cruise itineraries in Europe.

[4] Includes revenues of $47.4 million and $42.6 million for the quarter ended March 31 2018 and 2017, respectively, related to cancellation fees, sales of vacation protection insurance and pre- and post-cruise tours and revenues of $23.0 million and $21.8 million for the quarter ended March 31 2018 and 2017, respectively, primarily related to our bareboat charter, procurement and management related services we perform on behalf of our unconsolidated affiliates

[5] No other individual country's revenue exceeded 10% for the quarter ended March 31, 2018 and 2017, respectively.