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Employee benefits - Changes in the defined benefit obligation and actuarial assumptions (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined benefit obligation and significant assumptions      
Defined benefit obligation at beginning of the year $ 18,153 $ 19,289 $ 13,438
Net period cost charged to profit or loss:      
Current service cost 8,214 4,977 3,657
Interest cost on benefit obligation 1,872 1,424 1,000
Remeasurement losses in other comprehensive income:      
Actuarial changes arising from changes in assumptions 10,192 (5,989) 1,776
Payments made (225) (1,548) (582)
Defined benefit obligation at end of the year $ 38,206 $ 18,153 $ 19,289
Discount rate 7.18% 9.91% 7.72%
Expected rate of salary increases 5.50% 5.65% 5.50%
Annual increase in minimum salary 4.00% 4.15% 4.00%
Employee profit-sharing (Note 15c) $ 296,829 $ 187,072 $ 114,781
Employee profit sharing      
Remeasurement losses in other comprehensive income:      
Employee profit-sharing (Note 15c) $ 24,097 $ 14,984 $ 9,063