Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Total revenues		$ 2,337,605	$ 2,195,274	$ 4,365,361	$ 4,203,834
Cruise Itinerary
Disaggregation of Revenue [Line Items]
Total revenues		2,246,395	2,109,542	4,203,819	4,052,799
Cruise Itinerary | North America
Disaggregation of Revenue [Line Items]
Total revenues	[1]	1,264,167	1,246,103	2,611,427	2,598,272
Cruise Itinerary | Asia Pacific
Disaggregation of Revenue [Line Items]
Total revenues	[2]	283,198	300,891	816,177	826,747
Cruise Itinerary | Europe
Disaggregation of Revenue [Line Items]
Total revenues	[3]	597,399	467,829	597,399	467,829
Cruise Itinerary | Other regions
Disaggregation of Revenue [Line Items]
Total revenues		101,631	94,719	178,816	159,951
Other Revenues
Disaggregation of Revenue [Line Items]
Total revenues	[4]	$ 91,210	$ 85,732	$ 161,542	$ 151,035
Passenger Ticket | Other regions
Disaggregation of Revenue [Line Items]
Percentage of revenues by country	[5]	27.00%	28.00%	38.00%	38.00%
Passenger Ticket | United States
Disaggregation of Revenue [Line Items]
Percentage of revenues by country		63.00%	63.00%	62.00%	62.00%
Passenger Ticket | United Kingdom
Disaggregation of Revenue [Line Items]
Percentage of revenues by country		10.00%	9.00%

[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).

[4] Includes revenues primarily related to cancellation fees, vacation protection insurance and pre- and post-cruise tours. Amounts also include revenues related to our bareboat charter, procurement and management related services we perform on behalf of our unconsolidated affiliates. Refer to Note 5. Other Assets for more information on our unconsolidated affiliates.

[5] No other individual country's revenue exceeded 10% for the quarters and six months ended June 30, 2018 and 2017.