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OTHER LIABILITIES - NON CURRENT AND CURRENT (Other liabilities - Non-current) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of other liabilities [Abstract] |  |
Post-employment benefits | $ 432,648 | $ 405,935
Other employee benefits | 52,647 | 44,496
Asset retirement obligation | 41,673 | 26,556
Other | 24,888 | 30,616
Other liabilities – Non-current | $ 551,856 | $ 507,603

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- Definition The amount of non-current provisions for employee benefits. [Refer: Provisions for employee benefits] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_d&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | credit
Period Type: | instant

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- Definition The amount of non-current liabilities that the entity does not separately disclose in the same statement or note. [Refer: Non-current liabilities] + 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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Asset Retirement Obligation, Noncurrent + References No definition available. + Details
Name: | tx_AssetRetirementObligationNoncurrent
Namespace Prefix: | tx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure of other liabilities [Abstract] + References No definition available. + Details
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- Definition Non-current miscellaneous other liabilities + References No definition available. + Details
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Period Type: | instant

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- Definition Post-employment benefit liability, non-current + References No definition available. + Details
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Namespace Prefix: | tx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant