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Intangible and other long-term assets (Schedule of Balances) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross $ 2,251,140 $ 2,260,095  
Other assets 71,816 75,022  
Intangible and other non-current assets, net 2,322,956 2,335,117 $ 2,300,052
Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [1] 107,380 116,335  
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 107,380 101,657  
Kobe Tech contract [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross $ 0  
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 $ 0 $ 14,678  
Amortization period (years) 20 20  
Customers list [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross $ 0  
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 4,647,531 4,631,644  
Other assets 71,816 75,022  
Intangible and other non-current assets, net 4,719,347 4,706,666 4,672,503
Cost [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [1] 298,071 282,184  
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 107,380 101,657  
Cost [Member] | Kobe Tech contract [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 125,141 118,471  
Cost [Member] | Customers list [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 65,550 62,056  
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 2,396,391 2,371,549  
Other assets  
Intangible and other non-current assets, net (2,396,391) (2,371,549) $ (2,372,451)
Accumulated amortization [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [1] 190,691 165,849  
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] | Republic trade mark [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross  
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 125,141 118,471  
Accumulated amortization [Member] | Customers list [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 65,550 47,378  
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  
Accumulated amortization [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]  
Accumulated amortization [Member] | Goodwill [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross [3]  
[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.