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Revenues - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Capitalized Contract Cost [Line Items]      
Passenger ticket revenues $ 2,439,767 $ 2,027,756  
Contract liability 2,200,000   $ 1,900,000
Contract asset 57,200   57,800
Commission, transportation and other      
Capitalized Contract Cost [Line Items]      
Prepaid travel agent commissions $ 182,900   $ 153,500
Minimum      
Capitalized Contract Cost [Line Items]      
Length of cruise 2 days    
Maximum      
Capitalized Contract Cost [Line Items]      
Length of cruise 25 days    
Port Costs      
Capitalized Contract Cost [Line Items]      
Passenger ticket revenues $ 152,000 $ 136,700