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Description of the business and summary of significant accounting policies - Employee benefits (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Nov. 06, 2014
Apr. 30, 2018
$ / shares
Dec. 31, 2020
USD ($)
Dec. 31, 2020
MXN ($)
$ / shares
Dec. 31, 2019
$ / shares
Dec. 31, 2019
MXN ($)
$ / shares
Dec. 31, 2018
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     $ 173,113 $ 3,453,382   3,600,762 $ 3,125,393
Quarterly incentive bonuses              
Share-based payments              
Salaries and benefits       25,918   62,825 67,680
Short-term benefit plan for certain key personnel              
Share-based payments              
Salaries and benefits       0   80,634 50,000
Restricted Stock Units              
Share-based payments              
Salaries and benefits       75,040   49,659 19,980
SARs - cash settled              
Share-based payments              
Salaries and benefits       (1,901)   2,964 (186)
Vesting period 3 years            
MIP I              
Share-based payments              
Exercise price | $ / shares         $ 5.31    
MIP II              
Share-based payments              
Salaries and benefits       $ 107,204      
Salaries and benefits           $ 37,760 $ (5,052)
Vesting period     5 years 5 years      
BODIP              
Share-based payments              
Vesting period   4 years          
Exercise price | $ / shares   $ 16.12   $ 9.74   $ 16.80 $ 16.12
Employee profit sharing              
Share-based payments              
Salaries and benefits       $ 13,458   $ 22,134 $ 14,106