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Financial instruments and risk management - Debt Sensitivity Analysis (Details)
$ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
MXN ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2021
USD ($)
Oct. 13, 2021
Dec. 31, 2020
USD ($)
Disclosure Of Foreign Exchange Exposure [Line Items]            
Income tax relating to components of other comprehensive income $ 2,805 $ (47,629) $ 71,762      
Basis points       0.25%    
Increase in basis point       100.00%   100.00%
Decrease in basis point       (100.00%)   (100.00%)
Banco Nacional de Comercio Exterior, S.N.C. ("Bancomext") [Member]            
Disclosure Of Foreign Exchange Exposure [Line Items]            
Increase in results       $ 138,476   $ 155,332
Decrease in results       (138,476)   (155,332)
Asset backed trust notes ("CEBUR"), in Mexican pesos            
Disclosure Of Foreign Exchange Exposure [Line Items]            
Basis points         200.00%  
Increase in results       133,173   131,054
Decrease in results       (133,173)   (131,054)
Banco Sabadell S.A., Institucin de Banca Multiple ("Sabadell") [Member]            
Disclosure Of Foreign Exchange Exposure [Line Items]            
Increase in results       16,064   18,086
Decrease in results       $ (16,064)   $ (18,086)
Minimum            
Disclosure Of Foreign Exchange Exposure [Line Items]            
Interest rate basis 4.25          
Maximum            
Disclosure Of Foreign Exchange Exposure [Line Items]            
Interest rate basis 5.50          
Interest rate Cap            
Disclosure Of Foreign Exchange Exposure [Line Items]            
Income tax relating to components of other comprehensive income $ 5,407          
Basis points       125.00%