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OTHER OPERATING INCOME (EXPENSES), NET - Footnote (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other operating income (expenses), net [Abstract] |  |  |
Recovery of provision related to the ICMS action of unconstitutionality | $ 380,075 | $ 0 | $ 0
Reversal of the asset in connection with the ICMS provision | $ 194,065 | $ 0 | $ 0

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- Definition Other operating income (expenses), net [Abstract] + References No definition available. + Details
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Namespace Prefix: | tx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Recovery of Provision Related to the Action of Unconstitutionality + References No definition available. + Details
Name: | tx_RecoveryOfProvisionRelatedToTheActionOfUnconstitutionality
Namespace Prefix: | tx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Reversal of the Asset in Connection with the Provision + References No definition available. + Details
Name: | tx_ReversalOfTheAssetInConnectionWithTheProvision
Namespace Prefix: | tx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration