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Material accounting policies - Assumptions and estimation uncertainties (Details)
$ in Thousands
 12 Months Ended
Feb. 07, 2024
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Apr. 18, 2024
Jan. 04, 2024
USD ($)
Disclosure of detailed information about property, plant and equipment [line items]            
Scrap value estimate, historical average period used     4 years      
Cash guarantees and deposits     $ 48,548 $ 1,616    
Proportion of ownership interest in subsidiary     100.00%      
CMB | CMB.TECH NV            
Disclosure of detailed information about property, plant and equipment [line items]            
Proportion of ownership interest in subsidiary 100.00%     100.00%    
MALAYSIA            
Disclosure of detailed information about property, plant and equipment [line items]            
Cash guarantees and deposits           $ 45,700
Anglo Eastern Univan Group Limited            
Disclosure of detailed information about property, plant and equipment [line items]            
Proportion of ownership interest in investment         0.10  
Forecast            
Disclosure of detailed information about property, plant and equipment [line items]            
Decrease in depreciation due to change in residual value   $ 10,800