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Employee benefits - Changes in the defined benefit obligation and actuarial assumptions (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined benefit obligation and significant assumptions      
Defined benefit obligation at beginning of the year $ 19,289 $ 13,438 $ 10,056
Net period cost charged to profit or loss:      
Current service cost 4,977 3,657 2,421
Interest cost on benefit obligation 1,423 1,000 701
Remeasurement losses in other comprehensive income:      
Actuarial changes arising from changes in assumptions (5,989) 1,776 442
Payments made (1,547) (582) (182)
Defined benefit obligation at end of the year $ 18,153 $ 19,289 $ 13,438
Discount rate 9.91% 7.72% 7.78%
Expected rate of salary increases 5.65% 5.50% 5.50%
Annual increase in minimum salary 4.15% 4.00% 4.00%
Employee profit-sharing (Note 15c) $ 187,072 $ 114,781 $ 170,994
Employee profit sharing      
Remeasurement losses in other comprehensive income:      
Employee profit-sharing (Note 15c) $ 14,984 $ 9,063 $ 10,695