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CASH, CASH EQUIVALENTS AND OTHER INVESTMENTS - NON CURRENT AND CURRENT (Other investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Cash, cash equivalents and other investments [Abstract] |  |
Investments in debt instruments and other | $ 2,629 | $ 3,001
Investments in debt instruments and other | 252 | 252
Other investments, net – Non-current | $ 2,881 | $ 3,253

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- Definition The amount of instruments representing indebtedness held by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_55&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Cash, cash equivalents and other investments [Abstract] + References No definition available. + Details
Name: | tx_CashcashequivalentsandotherinvestmentsAbstract
Namespace Prefix: | tx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Investments in companies under cost method + References No definition available. + Details
Name: | tx_Investmentsincompaniesundercostmethod
Namespace Prefix: | tx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Other investments, net, noncurrent + References No definition available. + Details
Name: | tx_Otherinvestmentsnetnoncurrent
Namespace Prefix: | tx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant