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Property, plant and equipment (Schedule of Cost of Investment 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
Balance at end of year | 16,737,595 | 16,970,832
Land [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 1,217,000 | 1,094,000
Balance at end of year | 1,291,000 | 1,217,000
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
Constructions and machinery in-progress [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 4,800,000 | 3,434,000
Balance at end of year | 4,761,000 | 4,800,000
Cost [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 36,562,000 | 34,396,000
Additions | 1,271,000 | 2,914,000
Translation adjustments | (805,000) | (748,000)
Balance at end of year | 37,028,000 | 36,562,000
Cost [Member] | Land [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 1,217,000 | 1,094,000
Additions | 89,000 | 137,000
Translation adjustments | (15,000) | (14,000)
Balance at end of year | 1,291,000 | 1,217,000
Cost [Member] | Buildings [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 4,680,000 | 4,776,000
Additions | 591,000 | 90,000
Translation adjustments | (133,000) | (186,000)
Balance at end of year | 5,138,000 | 4,680,000
Cost [Member] | Machinery and equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 25,567,000 | 24,805,000
Additions | 532,000 | 1,305,000
Translation adjustments | (563,000) | (543,000)
Balance at end of year | 25,536,000 | 25,567,000
Cost [Member] | Transportation equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 159,000 | 158,000
Additions | 2,000 | 1,000
Translation adjustments | 0 |
Balance at end of year | 161,000 | 159,000
Cost [Member] | Furniture, mixtures and computer Equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 139,000 | 129,000
Additions | 4,000 | 11,000
Translation adjustments | (2,000) | (1,000)
Balance at end of year | 141,000 | 139,000
Cost [Member] | Constructions and machinery in-progress [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 4,800,000 | 3,434,000
Additions | 53,000 | 1,370,000
Translation adjustments | (92,000) | (4,000)
Balance at end of year | $ 4,761,000 | $ 4,800,000

X
- Definition The amount of additions to property, plant and equipment other than those acquired through business combinations. [Refer: Business combinations [member]; 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 i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2019-en-r&anchor=para_73_e_i&doctype=Standard -URIDate 2019-03-27 + 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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- 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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- 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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- Details
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