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Revenues - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Capitalized Contract Cost [Line Items]          
Passenger ticket revenues $ 2,806,631 $ 2,337,605 $ 5,246,398 $ 4,365,361  
Contract liability 2,400,000   2,400,000   $ 1,900,000
Contract asset 56,600   56,600   57,800
Commission, transportation and other          
Capitalized Contract Cost [Line Items]          
Prepaid travel agent commissions 197,400   $ 197,400   $ 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 $ 173,600 $ 151,400 $ 325,600 $ 288,100