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Current and long-term debt - 2023 $94.0 million credit facility (Details)
 1 Months Ended 12 Months Ended
Oct. 31, 2023
USD ($)
vessel
Sep. 30, 2023
USD ($)
vessel
Dec. 31, 2023
USD ($)
vessel
Dec. 31, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]        
Borrowings     $ 1,588,290,000 $ 1,436,224,000
Number of vessels | vessel     1  
Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings     $ 1,617,439,000 1,948,592,000
Drawdowns     1,386,482,000  
2023 $94.0 Million Credit Facility        
Disclosure of detailed information about borrowings [line items]        
Borrowings instrument, term   5 years    
Periodic borrowing payment amount   $ 2,400,000    
Net debt to capitalization ratio   0.65    
Consolidated tangible net worth   $ 1,500,000,000    
Minimum ratio for fair value of vessels   143.00%    
Loan maximum borrowing capacity   $ 94,000,000    
2023 $94.0 Million Credit Facility | Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Borrowings     92,908,000 $ 0
Drawdowns     $ 94,000,000  
2023 $94.0 Million Credit Facility | Consolidated Liquidity Requirement - Scenario One        
Disclosure of detailed information about borrowings [line items]        
Covenant liquidity requirement amount   25,000,000    
2023 $94.0 Million Credit Facility | Consolidated Liquidity Requirement - Scenario Two        
Disclosure of detailed information about borrowings [line items]        
Liquidity requirement, per each owned ship   500,000    
Liquidity requirement, per each chartered-in ship   $ 250,000    
2023 $94.0 Million Credit Facility | Secured Overnight Financing Rate (SOFR)        
Disclosure of detailed information about borrowings [line items]        
Adjustment to interest rate basis   1.70%    
2023 $94.0 Million Credit Facility | STI Marshall and STI Grace        
Disclosure of detailed information about borrowings [line items]        
Drawdowns   $ 43,800,000    
Number of vessels | vessel   2    
2023 $94.0 Million Credit Facility | STI Guide and STI Gauntlet        
Disclosure of detailed information about borrowings [line items]        
Drawdowns $ 50,200,000      
Number of vessels | vessel 2