General (Details) destination in Thousands, £ in Millions		1 Months Ended	3 Months Ended
		Jun. 30, 2021 USD ($) ship destination continent brand	Mar. 31, 2021 GBP (£)	Aug. 31, 2021 ship	Mar. 31, 2021 USD ($)	Mar. 19, 2021 USD ($) ship	Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items]
Number of cruise brands | brand		3
Number of cruise ships | ship		60
Number of destinations | destination		1
Number of continents | continent		7
Number of ships that have resumed or announced intention to resume sailing | ship		36
Liquidity		$ 5,000,000,000.0
Cash and cash equivalents		$ 4,250,369,000					$ 3,684,474,000
Debt repayment | £			£ 300.0
Scenario, Forecast
Schedule of Equity Method Investments [Line Items]
Number of ships homeporting from U.S. | ship				12
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Azamara
Schedule of Equity Method Investments [Line Items]
Number of ships sold | ship						3
Total consideration from sale						$ 201,000,000
Maximum
Schedule of Equity Method Investments [Line Items]
Investment in a joint venture, percentage of interest		50.00%
Maximum | Unsecured term loans
Schedule of Equity Method Investments [Line Items]
Debt Fixed Rate	[1]	5.41%
Maximum | Secured senior notes
Schedule of Equity Method Investments [Line Items]
Debt Fixed Rate	[1]	11.50%
Minimum
Schedule of Equity Method Investments [Line Items]
Investment in a joint venture, percentage of interest		20.00%
Minimum | Unsecured term loans
Schedule of Equity Method Investments [Line Items]
Debt Fixed Rate	[1]	2.53%
Minimum | Secured senior notes
Schedule of Equity Method Investments [Line Items]
Debt Fixed Rate	[1]	10.88%
Unsecured Term Loan Agreement | Unsecured term loans
Schedule of Equity Method Investments [Line Items]
Debt instrument, face amount		$ 1,000,000,000.0			$ 1,000,000,000.0
Silversea Notes | Secured senior notes
Schedule of Equity Method Investments [Line Items]
Debt Fixed Rate		7.25%
Debt repayment		$ 619,800,000
Line of Credit | Term Loan Facility, $700 Million
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity		700,000,000			700,000,000.0
Revolving Credit Facility | Unsecured Revolving Credit Facility Due 2024
Schedule of Equity Method Investments [Line Items]
Maximum borrowing capacity		$ 1,600,000,000			$ 1,550,000,000
TUI Cruises
Schedule of Equity Method Investments [Line Items]
Investment in a joint venture, percentage of interest		50.00%

[1] Interest rates based on outstanding loan balance as of June 30, 2021 and, for variable rate debt, include either LIBOR or EURIBOR plus the applicable margin.