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Description of the business and summary of significant accounting policies - Employee benefits (Details)
$ / shares in Units, $ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Nov. 06, 2014
Apr. 30, 2018
Dec. 31, 2021
USD ($)
Dec. 31, 2021
MXN ($)
$ / shares
Dec. 31, 2020
MXN ($)
$ / shares
Dec. 31, 2019
MXN ($)
$ / shares
Share-based payments            
Termination benefits provision         $ 0 $ 0
Number of days' wages for each year of service provided as seniority premium benefits     12 days 12 days    
Minimum years of service to receive seniority premium benefits     15 years 15 years    
Salaries and benefits     $ 235,970 $ 4,857,083 3,453,382 3,600,762
Quarterly incentive bonuses            
Share-based payments            
Salaries and benefits       75,418 25,918 62,825
Restricted Stock Units            
Share-based payments            
Salaries and benefits       $ 89,464 75,040 49,659
SARs - cash settled            
Share-based payments            
Salaries and benefits         (1,901) 2,964
Vesting period 3 years          
MIP I            
Share-based payments            
Exercise price | $ / shares       $ 5.31    
MIP II            
Share-based payments            
Salaries and benefits       $ 62,262    
Salaries and benefits         $ 107,204 $ 37,760
Vesting period     5 years 5 years    
BODIP            
Share-based payments            
Vesting period   5 years 5 years 5 years    
Exercise price | $ / shares       $ 32.23 $ 9.74 $ 16.80
Employee profit sharing            
Share-based payments            
Salaries and benefits       $ 262,667 $ 13,458 $ 22,134