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Vessels - Operating vessels and drydock rollforward (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
USD ($)
vessel
tanker
Dec. 31, 2022
USD ($)
vessel
Dec. 31, 2021
USD ($)
Nov. 30, 2023
USD ($)
Changes in Property, Plant and Equipment [Roll Forward]        
Beginning balance $ 3,089,254      
Reversal of previously recorded impairment 0 $ (12,708) $ 0  
Ending balance 3,577,935 $ 3,089,254    
Number of vessels in agreement to sell | vessel   18    
Property, plant and equipment $ 3,577,935 $ 3,089,254    
STI Ville and STI Amber | MR | Sale of Vessels        
Changes in Property, Plant and Equipment [Roll Forward]        
Number of vessels in agreement to sell | vessel 2      
Cost        
Changes in Property, Plant and Equipment [Roll Forward]        
Beginning balance $ 4,162,703 4,918,357    
Transfer from right of use assets, net 698,884      
Additions 21,449 40,233    
Disposal of vessels (82,563) (780,891)    
Write-offs (2,271) (14,996)    
Ending balance 4,798,202 4,162,703 4,918,357  
Property, plant and equipment 4,798,202 4,162,703 4,918,357  
Accumulated depreciation and impairment        
Changes in Property, Plant and Equipment [Roll Forward]        
Beginning balance (1,073,449) (1,076,286)    
Charge for the period (178,259) (168,008)    
Disposal of vessels 29,941 143,141    
Reversal of previously recorded impairment   12,708    
Write-offs 1,500 14,996    
Ending balance (1,220,267) (1,073,449) (1,076,286)  
Property, plant and equipment (1,220,267) (1,073,449) (1,076,286)  
Vessels        
Changes in Property, Plant and Equipment [Roll Forward]        
Beginning balance 3,028,804      
Ending balance 3,524,321 3,028,804    
Property, plant and equipment 3,524,321 3,028,804    
Vessels | Sale of Vessels        
Changes in Property, Plant and Equipment [Roll Forward]        
Beginning balance $ 637,800      
Ending balance   637,800    
Number of vessels in agreement to sell | vessel 19      
Property, plant and equipment   $ 637,800    
Vessels | LR2        
Changes in Property, Plant and Equipment [Roll Forward]        
Number of ships purchased, previously recorded as right of use assets | tanker 4      
Vessels | MR        
Changes in Property, Plant and Equipment [Roll Forward]        
Number of ships purchased, previously recorded as right of use assets | tanker 17      
Vessels | STI Ville and STI Amber | MR | Sale of Vessels        
Changes in Property, Plant and Equipment [Roll Forward]        
Property, plant and equipment       $ 52,600
Vessels | STI Savile Row, STI Carnaby and STI Nautilus | LR2        
Changes in Property, Plant and Equipment [Roll Forward]        
Number of vessels in agreement to sell | vessel   3    
Vessels | STI Fontvieille and STI Benicia | MR        
Changes in Property, Plant and Equipment [Roll Forward]        
Number of vessels in agreement to sell | vessel   2    
Vessels | STI Excelsior, STI Executive, STI Excellence, STI Pride, STI Providence, STI Prestige, STI Experience, STI Express, STI Exceed, STI Excel, STI Expedite, and STI Precision | LR1        
Changes in Property, Plant and Equipment [Roll Forward]        
Number of vessels in agreement to sell | vessel   12    
Vessels | Cost        
Changes in Property, Plant and Equipment [Roll Forward]        
Beginning balance $ 4,045,062 $ 4,782,886    
Transfer from right of use assets, net 695,162      
Additions 4,711 20,426    
Disposal of vessels (79,429) (758,250)    
Write-offs (771) 0    
Ending balance 4,664,735 4,045,062 4,782,886  
Property, plant and equipment 4,664,735 4,045,062 4,782,886  
Vessels | Accumulated depreciation and impairment        
Changes in Property, Plant and Equipment [Roll Forward]        
Beginning balance (1,016,258) (1,020,407)    
Charge for the period (152,661) (145,140)    
Disposal of vessels 28,505 136,581    
Reversal of previously recorded impairment   12,708    
Write-offs 0 0    
Ending balance (1,140,414) (1,016,258) (1,020,407)  
Property, plant and equipment (1,140,414) (1,016,258) (1,020,407)  
Drydock        
Changes in Property, Plant and Equipment [Roll Forward]        
Beginning balance 60,450      
Ending balance 53,614 60,450    
Property, plant and equipment 53,614 60,450    
Drydock | Cost        
Changes in Property, Plant and Equipment [Roll Forward]        
Beginning balance 117,641 135,471    
Transfer from right of use assets, net 3,722      
Additions 16,738 19,807    
Disposal of vessels (3,134) (22,641)    
Write-offs (1,500) (14,996)    
Ending balance 133,467 117,641 135,471  
Property, plant and equipment 133,467 117,641 135,471  
Drydock | Accumulated depreciation and impairment        
Changes in Property, Plant and Equipment [Roll Forward]        
Beginning balance (57,191) (55,879)    
Charge for the period (25,598) (22,868)    
Disposal of vessels 1,436 6,560    
Reversal of previously recorded impairment   0    
Write-offs 1,500 14,996    
Ending balance (79,853) (57,191) (55,879)  
Property, plant and equipment $ (79,853) $ (57,191) $ (55,879)