Revenues - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Capitalized Contract Cost [Line Items]
Passenger ticket revenues	$ 42,014	$ 2,032,750
Customer refunds	107,300		$ 95,800
Contract liability	503,300		124,800
Contract asset	53,700		53,700
Commission, transportation and other
Capitalized Contract Cost [Line Items]
Prepaid travel agent commissions	$ 13,600		$ 1,100
Minimum
Capitalized Contract Cost [Line Items]
Length of cruise	2 days
Maximum
Capitalized Contract Cost [Line Items]
Length of cruise	24 days
Port Costs
Capitalized Contract Cost [Line Items]
Passenger ticket revenues	$ 1,500	$ 124,500