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Intangible and other long-term assets (Schedule of Balances) (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross $ 2,270,914 $ 2,274,668  
Other assets 29,138 196,880  
Intangible and other non-current assets, net 2,300,052 2,471,548 $ 2,544,273
Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 127,154 [1] 130,908  
Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 2,143,760 [2] 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 $ 105,879 $ 106,303  
Amortization period (years)  
Kobe Tech contract [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross    
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 $ 21,275 $ 24,605  
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    
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 $ 329,600 [3] $ 329,600  
Goodwill [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 1,814,160 [3] 1,814,160  
Cost [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 4,643,365 4,644,543  
Other assets 29,138 196,880  
Intangible and other non-current assets, net 4,672,503 4,841,423 4,810,053
Cost [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 293,905 [1] 295,083  
Cost [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 4,349,460 [2] 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 105,879 106,303  
Cost [Member] | Kobe Tech contract [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 123,392 123,887  
Cost [Member] | Customers list [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 64,634 64,893  
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 329,600 [3] 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 1,814,160 [3] 1,814,160  
Accumulated amortization [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 2,372,451 2,369,875  
Other assets    
Intangible and other non-current assets, net (2,372,451) (2,369,875) $ (2,265,780)
Accumulated amortization [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 166,751 [1] 164,175  
Accumulated amortization [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 2,205,700 [2] 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 123,392 123,887  
Accumulated amortization [Member] | Customers list [Member] | Republic [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross 43,359 40,288  
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    
Accumulated amortization [Member] | Goodwill [Member] | Grupo San [Member]      
Disclosure of detailed information about intangible assets [line items]      
Intangible and other non-current assets, gross    
[1] Intangible assets from the Republic acquisition.
[2] Intangible assets from the Grupo San acquisition.
[3] The trade mark San 42 and the goodwill are presented net of impairment losses recorded in 2009 for $16,000 and $ 2,352,000, respectively.