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Current and long-term debt - Ocean Yield lease financing (Details)
1 Months Ended
Oct. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2017
USD ($)
vessel
Dec. 31, 2023
USD ($)
vessel
Dec. 31, 2022
USD ($)
vessel
Sep. 01, 2017
USD ($)
Disclosure of detailed information about borrowings [line items]            
Number of vessels | vessel       1    
Borrowings       $ 1,588,290,000 $ 1,436,224,000  
Ocean Yield Lease Financing            
Disclosure of detailed information about borrowings [line items]            
Sale leaseback, option to purchase period     7 years      
Net debt to capitalization ratio     0.60      
Consolidated tangible net worth     $ 1,000,000,000      
Cumulative positive net income     25.00%      
Borrowings, restrictive covenants, percent of new equity offerings           50.00%
Vessels            
Disclosure of detailed information about borrowings [line items]            
Number of vessels | vessel       111 113  
Vessels | Ocean Yield Lease Financing | STI Sanctity            
Disclosure of detailed information about borrowings [line items]            
Sale-leaseback transaction, purchase option price   $ 27,800,000        
Vessels | Ocean Yield Lease Financing | STI Steadfast and STI Supreme            
Disclosure of detailed information about borrowings [line items]            
Sale-leaseback transaction, purchase option price $ 27,800,000          
LR2 | NPTI September Closing | Ocean Yield Lease Financing | STI Sanctity, STI Steadfast, STI Supreme and STI Symphony            
Disclosure of detailed information about borrowings [line items]            
Borrowings, bareboat charter term     13 years      
LR2 | NPTI September Closing | Ocean Yield Lease Financing | Secured Overnight Financing Rate (SOFR) | STI Sanctity, STI Steadfast, STI Supreme and STI Symphony            
Disclosure of detailed information about borrowings [line items]            
Adjustment to interest rate basis     5.40%      
LR2 | NPTI September Closing | Vessels | Ocean Yield Lease Financing | STI Sanctity, STI Steadfast, STI Supreme and STI Symphony            
Disclosure of detailed information about borrowings [line items]            
Number of vessels | vessel     4      
Monthly payments | LR2 | NPTI September Closing | Ocean Yield Lease Financing | STI Sanctity, STI Steadfast, STI Supreme and STI Symphony            
Disclosure of detailed information about borrowings [line items]            
Periodic payment per vessel     $ 200,000      
Monthly payment increase | LR2 | NPTI September Closing | Ocean Yield Lease Financing | STI Sanctity, STI Steadfast, STI Supreme and STI Symphony            
Disclosure of detailed information about borrowings [line items]            
Periodic payment per vessel     $ 300,000      
Consolidated Liquidity Requirement - Scenario One | Ocean Yield Lease Financing            
Disclosure of detailed information about borrowings [line items]            
Covenant liquidity requirement amount           $ 25,000,000
Consolidated Liquidity Requirement - Scenario Two | Ocean Yield Lease Financing            
Disclosure of detailed information about borrowings [line items]            
Consolidated liquidity requirement per each owned vessel           500,000
Consolidated liquidity requirement per each chartered-in vessel           $ 250,000