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Equity - Authorized shares and secondary follow-on equity offering (Details)
$ / shares in Units, $ / shares in Units, $ in Thousands
12 Months Ended
Dec. 20, 2021
shares
Dec. 11, 2020
MXN ($)
shares
Dec. 11, 2020
USD ($)
$ / shares
shares
Dec. 31, 2021
EquityInstruments
$ / shares
shares
Dec. 31, 2020
MXN ($)
EquityInstruments
shares
Equity          
Par value | $ / shares       $ 0  
Number of authorized shares       1,165,976,677 1,165,976,677
Treasury shares       (9,904,197) (19,020,202)
Shares fully subscribed and paid       1,156,072,480 1,146,956,475
Forfeited during the year | EquityInstruments       551,732 327,217
Proceeds from issuance of shares     $ 164,419,000   $ 3,272,832
Increase in capital stock | $   $ 3,272,832     $ 3,272,832
Series A shares          
Equity          
Number of authorized shares       1,108,462,804 1,077,924,804
Number of shares per CPO   1 1    
Series B shares          
Equity          
Number of authorized shares       57,513,873 88,051,873
Conversion of equivalent number of shares 30,538,000       30,538,000
Fixed Class I          
Equity          
Number of authorized shares       24,180 24,180
Shares fully subscribed and paid       24,180 24,180
Fixed Class I | Series A shares          
Equity          
Number of authorized shares       10,478 10,478
Fixed Class I | Series B shares          
Equity          
Number of authorized shares       13,702 13,702
Variable Class II          
Equity          
Number of authorized shares       1,165,952,497 1,165,952,497
Treasury shares       (9,904,197) (19,020,202)
Shares fully subscribed and paid       1,156,048,300 1,146,932,295
Variable Class II | Series A shares          
Equity          
Number of authorized shares       1,108,452,326 1,077,914,326
Variable Class II | Series B shares          
Equity          
Number of authorized shares       57,500,171 88,038,171
American Depositary Shares          
Equity          
Weighted average share price | $ / shares     $ 11.25    
Number of CPOs per ADS   10 10    
Primary follow-on equity offering          
Equity          
Number of shares offered   134,000,000 134,000,000    
Over-allotment | American Depositary Shares          
Equity          
Number of shares issued   20,100,000 20,100,000