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Intangible and other long-term assets (Schedule of Reconciliation between Opening and Closing Balances) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about intangible assets [line items]    
Balance $ 2,335,117 $ 2,300,052
Additions
Adjustment effect of the year (12,161) 35,065
Balance 2,322,956 2,335,117
Cost [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balance 4,706,666 4,672,503
Additions 11,250 9,880
Adjustment effect of the year 1,431 24,283
Balance 4,719,347 4,706,666
Accumulated amortization [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balance (2,371,549) (2,372,451)
Additions (11,250) (9,880)
Adjustment effect of the year (13,592) 10,782
Balance $ (2,396,391) $ (2,371,549)