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Employee benefits - Changes in the defined benefit obligation and actuarial assumptions (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined benefit obligation and significant assumptions      
Defined benefit obligation at beginning of the year $ 38,151 $ 18,153  
Net period cost charged to profit or loss:      
Current service cost 8,449 8,214  
Interest cost on benefit obligation 2,630 1,872  
Remeasurement losses in other comprehensive income:      
Actuarial changes arising from changes in assumptions 2,651 10,192  
Payments made (1,254) (225)  
Defined benefit obligation at end of the year $ 50,627 $ 38,206  
Discount rate 7.04% 7.18% 9.91%
Expected rate of salary increases 5.50% 5.50% 5.65%
Annual increase in minimum salary 4.00% 4.00% 4.15%
Employee profit-sharing (Note 15c) $ 337,467 $ 296,829  
Employee profit sharing      
Remeasurement losses in other comprehensive income:      
Employee profit-sharing (Note 15c) $ 14,417 $ 24,097