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Employee benefits - Changes in the defined benefit obligation and actuarial assumptions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Defined benefit obligation and significant assumptions    
Defined benefit obligation at beginning of the year $ 10,987 $ 3,968
Net period cost charged to profit or loss:    
Current service cost 2,187 6,518
Interest cost on benefit obligation 1,109 692
Remeasurement losses in other comprehensive income:    
Actuarial changes arising from changes in assumptions 107 (253)
Payments made (1,321) (179)
Conversion effect foreign currency 1,575 241
Defined benefit obligation at end of the year $ 14,644 $ 10,987
Discount rate 9.69% 9.21%
Expected rate of salary increases 5.60% 5.50%
Employee profit-sharing (Note 16) $ 19,628 $ 19,091
General Zone    
Remeasurement losses in other comprehensive income:    
Annual increase in minimum salary 3.75% 19.00%
General Zone | MEXICO    
Remeasurement losses in other comprehensive income:    
Annual increase in minimum salary 3.75% 19.00%
Border Zone    
Remeasurement losses in other comprehensive income:    
Annual increase in minimum salary   4.00%
Border Zone | MEXICO    
Remeasurement losses in other comprehensive income:    
Annual increase in minimum salary 3.75% 4.00%
Employee profit sharing    
Remeasurement losses in other comprehensive income:    
Employee profit-sharing (Note 16) $ 1,500 $ 386