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Debt - Narrative (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jul. 31, 2018
USD ($)
Jan. 31, 2017
USD ($)
Long-Term Debt          
Long-term debt $ 130,000,000.0        
Short-term debt amount outstanding   $ 1,200,000,000.0      
Number of ships under capital leases   2 2    
Aggregate lease payments   $ 18,800,000 $ 18,800,000    
Symphony of the Seas          
Long-Term Debt          
Long-term debt   $ 1,200,000,000.0 $ 1,200,000,000.0    
Fixed interest rate   3.82% 3.82%    
Long term debt, term 12 years        
LIBOR          
Long-Term Debt          
Debt Floating Rate   1.195%      
LIBOR | Silversea Cruises          
Long-Term Debt          
Debt Floating Rate   1.00%      
Commercial Paper          
Long-Term Debt          
Borrowings outstanding   $ 1,000,000,000 $ 1,000,000,000    
Weighted average interest rate   2.73% 2.73%    
Long term debt, term     32 days    
Senior Notes          
Long-Term Debt          
Fixed interest rate         7.25%
Debt fair value       $ 672,000,000  
Silver Explorer | Capital Lease Obligations          
Long-Term Debt          
Long term debt, term     6 years    
Silversea Cruises          
Long-Term Debt          
Number of ships under capital leases       2  
Capital lease obligation       $ 82,800,000  
Silversea Cruises | Silversea Cruises          
Long-Term Debt          
Long-term debt       $ 700,000,000  
Silversea Cruises | Senior Notes          
Long-Term Debt          
Long-term debt         $ 620,000,000