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Employee benefits (Schedule of Components of Expense) (Details) - MXN ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of defined benefit plans [abstract] |  |  |
Cost of sales | $ (5,550) | $ (4,534) | $ 5,539
Administrative expenses | (4,360) | (3,563) | 4,352
Net cost of benefits | $ (9,910) | $ (8,097) | $ 9,891

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- References No definition available. + Details
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Period Type: | duration

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- Definition Administrative expenses during period for defined benefit plan. + References No definition available. + Details
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Namespace Prefix: | simecb_
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- Definition Cost of sales during period for defined benefit plan. + References No definition available. + Details
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Namespace Prefix: | simecb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net cost of benefits during the year. + References No definition available. + Details
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Balance Type: | debit
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