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Fair Value Measurements and Derivative Instruments - Derivative Instruments, Interest Rate Risk, Foreign Currency Exchange Rate Risk (Narrative) (Details)
$ in Thousands, € in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2019
USD ($)
ship
Mar. 31, 2019
EUR (€)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Mar. 31, 2019
EUR (€)
ship
Sep. 30, 2018
ship
Gains and losses from derivatives involved in hedging relationships              
Derivative instrument, credit risk exposure $ 19,200     $ 5,600      
Maximum length of time hedged in derivative contract 3 years 3 years          
Percentage of debt bearing fixed interest 61.30%     59.10%   61.30%  
Interest rate swaps              
Gains and losses from derivatives involved in hedging relationships              
Derivative, notional amount $ 3,400,000     $ 3,400,000      
Forward Contracts              
Gains and losses from derivatives involved in hedging relationships              
Change in fair value of foreign currency forward contracts recognized in earnings 5,000   $ 5,600        
Forward Contracts | Not Designated              
Gains and losses from derivatives involved in hedging relationships              
Derivative, notional amount 663,600            
Foreign exchange contracts              
Gains and losses from derivatives involved in hedging relationships              
Derivative, notional amount 3,700,000     $ 3,700,000      
Cruise ships on order              
Gains and losses from derivatives involved in hedging relationships              
Aggregate cost of ships on order, not including partner brands on order 11,400,000            
Amount deposited for cost of ships on order $ 667,800            
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate 54.00%     53.50%   54.00%  
TUI Cruises | Forward Contracts | Designated as Hedging Instrument              
Gains and losses from derivatives involved in hedging relationships              
Derivative, notional amount $ 113,400         € 101.0  
Foreign currency debt              
Gains and losses from derivatives involved in hedging relationships              
Carrying value of non-derivative instrument designated as hedging instrument 313,205     $ 320,152      
Foreign currency debt | TUI Cruises              
Gains and losses from derivatives involved in hedging relationships              
Carrying value of non-derivative instrument designated as hedging instrument $ 313,200 € 279.0   $ 320,200 € 280.0    
Silversea Cruises | Cruise ships on order              
Gains and losses from derivatives involved in hedging relationships              
Number of ships under construction | ship 3         3  
Royal Caribbean International Cruise Ships | Silversea Cruises | Cruise ships on order              
Gains and losses from derivatives involved in hedging relationships              
Number of ships under construction | ship 2         2 2