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Commitments and Contingencies - Narrative (Details)
€ in Millions
1 Months Ended 9 Months Ended
Aug. 27, 2019
lawsuit
Sep. 30, 2019
USD ($)
agreement
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2019
EUR (€)
Dec. 31, 2018
Unrecorded Unconditional Purchase Obligation [Line Items]            
Number of claims filed | lawsuit 2          
Number of months considered to determine requirement of prepayment of debts       24 months    
Cruise ships on order            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Aggregate cost of ships on order, not including TUI cruises on order       $ 11,100,000,000    
Deposit for the purchase of ships expected to enter service   $ 705,500,000   $ 705,500,000    
Percentage of aggregate cost exposed to fluctuations in the euro exchange rate   57.90%   57.90% 57.90% 53.50%
Line of Credit | Minimum            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Debt instrument covenant, minimum percentage of ownership by a person   50.00%   50.00% 50.00%  
Debt Securities | Minimum            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Debt instrument covenant, minimum percentage of ownership by a person   50.00%   50.00% 50.00%  
Unsecured Debt | Silver Moon Credit Agreement            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Long-term debt     $ 300,000,000      
Unsecured Debt | Silversea Cruises | Line of Credit            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Number of credit agreements | agreement   2        
Unsecured Debt | Silversea Cruises | Evolution Class Ship One            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Maximum contract price financed, percentage   80.00%        
Unsecured term loan, maximum borrowing commitment   $ 383,300,000   $ 383,300,000 € 351.6  
Long term debt, term   12 years        
Interest rate   4.14%   4.14% 4.14%  
Unsecured Debt | Silversea Cruises | Evolution Class Ship Two            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Maximum contract price financed, percentage   80.00%        
Unsecured term loan, maximum borrowing commitment   $ 391,400,000   $ 391,400,000 € 359.0  
Long term debt, term   12 years        
Interest rate   4.18%   4.18% 4.18%  
Unsecured Debt | Euler Hermes            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Percentage guaranteed by export credit agency   95.00%        
LIBOR | Unsecured Debt | Silver Moon Credit Agreement            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Debt Floating Rate     1.50%      
LIBOR | Unsecured Debt | Silversea Cruises | Evolution Class Ship One            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Debt Floating Rate   0.79%        
LIBOR | Unsecured Debt | Silversea Cruises | Evolution Class Ship Two            
Unrecorded Unconditional Purchase Obligation [Line Items]            
Debt Floating Rate   0.83%