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Vessels, Net - Additional Information (Details)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
vessel
Sep. 30, 2021
USD ($)
vessel
Dec. 31, 2020
vessel
Property, Plant and Equipment [Abstract]      
Number of impaired vessels   0 0
Number of vessels provided as collateral 23 23  
Vessels provided as collateral | $ $ 499,138 $ 499,138  
Number of vessels sold and leased back 12    
Carrying value of vessels sold and leased back | $ $ 305,346 $ 305,346