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Property, plant and equipment (Schedule of Accumulated Depreciation of Property, Plant and Equipment) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | $ 16,970,832 | $ 15,737,081
Depreciation expense | 1,098,749 | 1,102,331
Balance at end of year | 16,737,595 | 16,970,832
Buildings [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 3,625,000 | 3,743,000
Balance at end of year | 4,056,000 | 3,625,000
Machinery and equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 7,187,000 | 7,331,000
Balance at end of year | 6,489,000 | 7,187,000
Transportation equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 78,000 | 78,000
Balance at end of year | 76,000 | 78,000
Furniture, mixtures and computer Equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 64,000 | 57,000
Balance at end of year | 64,000 | 64,000
Accumulated amortization [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 19,591,000 | 18,659,000
Depreciation expense | 1,099,000 | 1,102,000
Translation effects | (399,000) | (170,000)
Balance at end of year | 20,291,000 | 19,591,000
Accumulated amortization [Member] | Buildings [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 1,055,000 | 1,033,000
Depreciation expense | 30,000 | 37,000
Translation effects | (3,000) | (15,000)
Balance at end of year | 1,082,000 | 1,055,000
Accumulated amortization [Member] | Machinery and equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 18,380,000 | 17,474,000
Depreciation expense | 1,063,000 | 1,057,000
Translation effects | (396,000) | (151,000)
Balance at end of year | 19,047,000 | 18,380,000
Accumulated amortization [Member] | Transportation equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 81,000 | 80,000
Depreciation expense | 4,000 | 3,000
Translation effects | 0 | (2,000)
Balance at end of year | 85,000 | 81,000
Accumulated amortization [Member] | Furniture, mixtures and computer Equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 75,000 | 72,000
Depreciation expense | 2,000 | 5,000
Translation effects | 0 | (2,000)
Balance at end of year | $ 77,000 | $ 75,000

X
- Definition The amount of depreciation expense. Depreciation is the systematic allocation of depreciable amounts of tangible assets over their useful lives. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase (decrease) in property, plant and equipment resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -Clause ix -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_ix&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of tangible assets that: (a) are held for use in the production or supply of goods or services, for rental to others, or for administrative purposes; and (b) are expected to be used during more than one period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2019-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e&doctype=Standard -URIDate 2019-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_a&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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