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Summary of Significant Accounting Policies - Vessels and equipment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Vessels and equipment      
Depreciation, Depletion and Amortization $ 97,551 $ 99,033 $ 106,084
Oil Tanker      
Vessels and equipment      
Property, plant and equipment, useful life 25 years    
Excluding amortization of Drydocking expenditure      
Vessels and equipment      
Depreciation, Depletion and Amortization $ 71,900 $ 71,900 $ 78,500
Dry-docking activity      
Vessels and equipment      
Property, Plant and Equipment, Estimated Useful Lives Useful Life, Lease Term [Member]