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Employee benefits - Changes in the defined benefit obligation and actuarial assumptions (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Defined benefit obligation and significant assumptions      
Defined benefit obligation at beginning of the year $ 13,438 $ 10,056 $ 7,737
Net period cost charged to profit or loss:      
Current service cost 3,657 2,421 2,012
Interest cost on benefit obligation 1,000 701 537
Remeasurement losses in other comprehensive income:      
Actuarial changes arising from changes in assumptions 1,776 442 1,174
Payments made (582) (182) (1,404)
Defined benefit obligation at end of the year $ 19,289 $ 13,438 $ 10,056
Discount rate 7.72% 7.78% 7.29%
Expected rate of salary increases 5.50% 5.50% 5.50%
Annual increase in minimum salary 4.00% 4.00% 4.00%
Salaries and benefits $ 114,781 $ 170,994  
Employee profit sharing      
Remeasurement losses in other comprehensive income:      
Salaries and benefits $ 9,063 $ 10,695