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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, 2020 | Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | $ 16,737,595 | $ 16,971,000
Depreciation expense | 1,441,021 | 1,098,749
Balance at end of year | 15,950,352 | 16,737,595
Buildings [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 4,056,000 | 3,625,000
Balance at end of year | 4,227,000 | 4,056,000
Machinery and equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 9,879,000 | 7,187,000
Balance at end of year | 9,255,000 | 9,879,000
Transportation equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 76,000 | 78,000
Balance at end of year | 75,000 | 76,000
Furniture, mixtures and computer equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 64,000 | 64,000
Balance at end of year | 63,000 | 64,000
Accumulated amortization [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 20,291,000 | 19,591,000
Depreciation expense | 1,441,000 | 1,099,000
Translation effects | 30,000 | (399,000)
Balance at end of year | 21,762,000 | 20,291,000
Accumulated amortization [Member] | Buildings [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 1,082,000 | 1,055,000
Depreciation expense | 152,000 | 30,000
Translation effects | (21,000) | (3,000)
Balance at end of year | 1,213,000 | 1,082,000
Accumulated amortization [Member] | Machinery and equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 19,047,000 | 18,380,000
Depreciation expense | 1,283,000 | 1,063,000
Translation effects | 52,000 | (396,000)
Balance at end of year | 20,382,000 | 19,047,000
Accumulated amortization [Member] | Transportation equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 85,000 | 81,000
Depreciation expense | 2,000 | 4,000
Translation effects | (1,000) | 0
Balance at end of year | 86,000 | 85,000
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 | 77,000 | 75,000
Depreciation expense | 4,000 | 2,000
Translation effects | 0 | 0
Balance at end of year | $ 81,000 | $ 77,000

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 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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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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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 2020-01-01 -Paragraph 73 -Subparagraph e -Clause ix -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e_ix&doctype=Standard -URIDate 2020-01-01 + Details
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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 2020-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_a&doctype=Standard -URIDate 2020-01-01 + Details
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Period Type: | instant

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