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Short-term debt (Details) $ in Thousands, $ in Thousands | Dec. 31, 2018 USD ($) | Dec. 31, 2018 MXN ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 MXN ($) | Aug. 17, 1998
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual interest rate | 0.25% | 0.25% | 0.25% | 0.25% |
Principal amount outstanding |  | $ 5,936 |  | $ 5,960 |
Medium-term notes of Simec [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Annual interest rate |  |  |  |  | 10.50%
Principal amount outstanding |  | $ 5,936,000 |  | $ 5,960,000 |
Medium-term notes of Simec [Member] | USD [Member] |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
Principal amount outstanding | $ 300 |  | $ 300 |  |

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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