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Current and long-term debt - BNPP Sinosure credit facility (Details)
 1 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
vessel
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2023
USD ($)
vessel
Jul. 31, 2023
Disclosure of detailed information about borrowings [line items]            
Number of vessels | vessel         1  
Borrowings   $ 1,436,224,000     $ 1,588,290,000  
BNPP Sinosure Credit Facility            
Disclosure of detailed information about borrowings [line items]            
Loan maximum borrowing capacity $ 134,100,000          
Drawdowns   $ 5,100,000 $ 1,900,000 $ 101,500,000    
Net debt to capitalization ratio 0.60          
Consolidated tangible net worth $ 1,000,000,000          
Cumulative positive net income 25.00%          
Net proceeds of equity issuance 50.00%          
BNPP Sinosure Credit Facility | Consolidated Liquidity Requirement - Scenario One            
Disclosure of detailed information about borrowings [line items]            
Covenant liquidity requirement amount $ 25,000,000          
BNPP Sinosure Credit Facility | Consolidated Liquidity Requirement - Scenario Two            
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          
BNPP Sinosure Credit Facility | Borrowings, Financial Covenants, Period One            
Disclosure of detailed information about borrowings [line items]            
Minimum ratio for fair value of vessels 130.00%          
BNPP Sinosure Credit Facility | Borrowings, Financial Covenants, Period Two            
Disclosure of detailed information about borrowings [line items]            
Minimum ratio for fair value of vessels 135.00%          
BNPP Sinosure Credit Facility | Repayment Period One            
Disclosure of detailed information about borrowings [line items]            
Periodic borrowing payment amount $ 5,500,000          
BNPP Sinosure Credit Facility | Repayment Period Two            
Disclosure of detailed information about borrowings [line items]            
Periodic borrowing payment amount 3,400,000          
BNPP Sinosure Credit Facility | Repayment Period Three            
Disclosure of detailed information about borrowings [line items]            
Periodic borrowing payment amount 900,000          
Commercial facility            
Disclosure of detailed information about borrowings [line items]            
Loan maximum borrowing capacity 67,000,000          
Commercial facility | Secured Overnight Financing Rate (SOFR)            
Disclosure of detailed information about borrowings [line items]            
Adjustment to interest rate basis           2.80%
Sinosure facility            
Disclosure of detailed information about borrowings [line items]            
Loan maximum borrowing capacity $ 67,000,000          
Number of vessels | vessel 5          
Sinosure facility | Secured Overnight Financing Rate (SOFR)            
Disclosure of detailed information about borrowings [line items]            
Adjustment to interest rate basis           1.80%