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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.

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