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Leases - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Jul. 31, 2021
May 31, 2021
Dec. 31, 2020
Lessee, Lease, Description [Line Items]          
Present value of lease liabilities $ 427,755,000 $ 427,755,000      
Variable lease cost   0      
Port Terminal          
Lessee, Lease, Description [Line Items]          
Purchase price 220,000,000.0        
Port Terminal | Subsequent Event          
Lessee, Lease, Description [Line Items]          
Cash collateral eliminated     $ 181,100,000    
Ships | Silver Whisper          
Lessee, Lease, Description [Line Items]          
Present value of lease liabilities $ 31,500,000 $ 31,500,000     $ 31,500,000
Additional lease term       12 months  
Minimum | Real Estate          
Lessee, Lease, Description [Line Items]          
Renewal term 1 year 1 year      
Minimum | Berthing Agreement          
Lessee, Lease, Description [Line Items]          
Renewal term 1 year 1 year      
Maximum | Real Estate          
Lessee, Lease, Description [Line Items]          
Renewal term 10 years 10 years      
Maximum | Berthing Agreement          
Lessee, Lease, Description [Line Items]          
Renewal term 20 years 20 years