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Property, plant and equipment (Narrative) (Details) $ in Thousands, $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2016 MXN ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Dec. 31, 2015 USD ($)
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |
Depreciation expense |  | $ 1,102,331 | $ 1,340,375 |  |  |  |  |  |
Invested amount in equipment |  | $ 1,994,465 | $ 3,039,501 | $ 3,100,259 |  |  |  |  |
Net Book Value |  |  |  | $ 14,491,000 |  | $ 16,970,832 |  | $ 15,737,081 |
Lorain Ohio facility [Member] | USD [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |
Net Book Value | $ 32,700 |  |  |  |  |  | $ 32,200 |  |
Impairment charge | $ 130,700 |  |  |  |  |  |  |  |
Republic Steel [Member] | USD [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |
Net Book Value |  |  |  |  |  |  |  |  | $ 130,700
Republic Steel [Member] | Electric arc furnace and associated equipment [Member] | USD [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about property, plant and equipment [line items] |  |  |  |  |  |  |  |  |
Invested amount in equipment |  |  |  |  | $ 158,800 |  |  |  |
Capitalized amount from labor and manufacturing overhead related to construction |  |  |  |  | $ 45,400 |  |  |  |

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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 amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; 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 v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_e_v&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_98_a&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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