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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, 2018 | Dec. 31, 2017
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | $ 15,737,081 | $ 14,491,000
Balance at end of year | 16,970,832 | 15,737,081
Land [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 1,094,000 | 1,105,000
Balance at end of year | 1,217,000 | 1,094,000
Buildings [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 3,743,000 | 3,854,000
Balance at end of year | 3,625,000 | 3,743,000
Machinery and Equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 7,331,000 | 6,103,000
Balance at end of year | 7,187,000 | 7,331,000
Transportation equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 78,000 | 77,000
Balance at end of year | 78,000 | 78,000
Furniture, mixtures and computer Equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 57,000 | 59,000
Balance at end of year | 64,000 | 57,000
Constructions and machinery in-progress [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 3,434,000 | 3,293,000
Balance at end of year | 4,800,000 | 3,434,000
Cost [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 34,396,000 | 32,101,000
Additions | 2,914,000 | 3,040,000
Translation adjustments | (748,000) | (745,000)
Balance at end of year | 36,562,000 | 34,396,000
Cost [Member] | Land [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 1,094,000 | 1,105,000
Additions | 137,000 |
Translation adjustments | (14,000) | (11,000)
Balance at end of year | 1,217,000 | 1,094,000
Cost [Member] | Buildings [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 4,776,000 | 4,859,000
Additions | 90,000 | 36,000
Translation adjustments | (186,000) | (119,000)
Balance at end of year | 4,680,000 | 4,776,000
Cost [Member] | Machinery and Equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 24,805,000 | 22,560,000
Additions | 1,305,000 | 2,817,000
Translation adjustments | (543,000) | (572,000)
Balance at end of year | 25,567,000 | 24,805,000
Cost [Member] | Transportation equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 158,000 | 155,000
Additions | 1,000 | 4,000
Translation adjustments |  | (1,000)
Balance at end of year | 159,000 | 158,000
Cost [Member] | Furniture, mixtures and computer Equipment [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 129,000 | 129,000
Additions | 11,000 | 2,000
Translation adjustments | (1,000) | (2,000)
Balance at end of year | 139,000 | 129,000
Cost [Member] | Constructions and machinery in-progress [Member] |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |
Balance at beginning of year | 3,434,000 | 3,293,000
Additions | 1,370,000 | 181,000
Translation adjustments | (4,000) | (40,000)
Balance at end of year | $ 4,800,000 | $ 3,434,000

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- 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 2018-01-01 -Paragraph 73 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_i&doctype=Standard -URIDate 2018-03-16 + Details
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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 2018-01-01 -Paragraph 73 -Subparagraph e -Clause ix -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_ix&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 73 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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