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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, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]    
Balance $ 2,300,052 $ 2,471,548
Disposals   (122,487)
Adjustment effect of the year 35,065 (49,009)
Balance 2,335,117 2,300,052
Cost [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balance 4,672,503 4,841,423
Additions 9,880 10,087
Disposals   (122,487)
Adjustment effect of the year 24,283 (56,520)
Balance 4,706,666 4,672,503
Accumulated amortization [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balance (2,372,451) (2,369,875)
Additions (9,880) (10,087)
Adjustment effect of the year 10,782 7,511
Balance $ (2,371,549) $ (2,372,451)