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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, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]    
Balance $ 2,471,548 $ 2,544,273
Additions   (80,131)
Low (122,487)  
Adjustment effect of the year (49,009) 7,406
Balance 2,300,052 2,471,548
Cost [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balance 4,841,423 4,810,053
Additions 10,087 45,253
Low (122,487)  
Adjustment effect of the year (56,520) (13,883)
Balance 4,672,503 4,841,423
Accumulated amortization [Member]    
Disclosure of detailed information about intangible assets [line items]    
Balance (2,369,875) (2,265,780)
Additions (10,087) (125,384)
Adjustment effect of the year 7,511 21,289
Balance $ (2,372,451) $ (2,369,875)