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Commitments and Contingencies - Additional Information - Presentation of Financial Statements (Details) - USD ($)
$ in Thousands
12 Months Ended 36 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2021
Loss Contingencies [Line Items]        
Net operating cash flow $ 319,909 $ 280,643 $ 305,200  
Working capital deficit (184,500)      
Current portion of long-term debt $ 353,238 $ 554,336    
Scenario, Forecast        
Loss Contingencies [Line Items]        
Anticipated payments for vessels under construction       $ 693,000