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Trade receivables - Net (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Trade and other receivables [abstract] |  |
Amount of advances related to allocation of accounts | $ 30,000 |
Nominal amount of accounts receivables | 11,200 | $ 23,100
Discounts fees | 300 | 500
Amount of recovered by buyer | $ 0 | $ 2,700

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- References No definition available. + Details
Name: | ifrs-full_TradeAndOtherReceivablesAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of advances related to allocation of accounts. + References No definition available. + Details
Name: | simecb_AmountOfAdvancesRelatedToAllocationOfAccounts
Namespace Prefix: | simecb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of recovered by buyer. + References No definition available. + Details
Name: | simecb_AmountOfRecoveredByBuyer
Namespace Prefix: | simecb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Discounts fees. + References No definition available. + Details
Name: | simecb_DiscountsFees
Namespace Prefix: | simecb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Nominal amount of accounts receivables. + References No definition available. + Details
Name: | simecb_NominalAmountOfAccountsReceivables
Namespace Prefix: | simecb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant