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Intangible and other long-term assets (Schedule of Balances) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross $ 2,260,095 $ 2,270,914  
Other assets 75,022 29,138  
Intangible and other non-current assets, net 2,335,117 2,300,052 $ 2,471,548
Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [1] 116,335 127,154  
Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [2] 2,143,760 2,143,760  
Republic trade mark [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross $ 101,657 $ 105,879  
Kobe Tech contract [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Amortization period (years) 12 12  
Customers list [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross $ 14,678 $ 21,275  
Amortization period (years) 20 20  
Customers list [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Amortization period (years) 9 9  
Trademark San 42 [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [3] $ 329,600 $ 329,600  
Goodwill [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [3] 1,814,160 1,814,160  
Cost [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 4,631,644 4,643,365  
Other assets 75,022 29,138  
Intangible and other non-current assets, net 4,706,666 4,672,503 4,841,423
Cost [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [1] 282,184 293,905  
Cost [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [2] 4,349,460 4,349,460  
Cost [Member] | Republic trade mark [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 101,657 105,879  
Cost [Member] | Kobe Tech contract [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 118,471 123,392  
Cost [Member] | Customers list [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 62,056 64,634  
Cost [Member] | Customers list [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 2,205,700 2,205,700  
Cost [Member] | Trademark San 42 [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [3] 329,600 329,600  
Cost [Member] | Goodwill [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [3] 1,814,160 1,814,160  
Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 2,371,549 2,372,451  
Other assets    
Intangible and other non-current assets, net (2,371,549) (2,372,451) $ (2,369,875)
Accumulated amortization [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [1] 165,849 166,751  
Accumulated amortization [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [2] 2,205,700 2,205,700  
Accumulated amortization [Member] | Kobe Tech contract [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 118,471 123,392  
Accumulated amortization [Member] | Customers list [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 47,379 43,359  
Accumulated amortization [Member] | Customers list [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross $ 2,205,700 $ 2,205,700  
[1] Intangible assets from the Republic acquisition.
[2] Intangible assets from the Grupo San acquisition.
[3] The San 42 trademark and the goodwill are presented net of impairment losses recorded in 2009 for $16,000 and $2,352,000, respectively.