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FINANCE LEASES - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended |
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Dec. 31, 2017 | Dec. 31, 2016
Disclosure of recognised finance lease as assets by lessee [line items] |  |
Current finance lease liabilities | $ 8,030 | $ 0
Non-current finance lease liabilities | 69,005 | $ 0
Finance lease liabilities | $ 77,035 |
Finance lease term | 15 years |
Finance lease amortisation period | 15 years |
PP&E |  |
Disclosure of recognised finance lease as assets by lessee [line items] |  |
Recognised finance lease as assets | $ 61,400 |

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- Definition The amount of current finance lease liabilities. [Refer: Finance lease liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2019-01-01 -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_55&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of liabilities related to finance leases. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2019-01-01 -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_55&doctype=Standard&book=B -URIDate 2017-03-09 + Details
Name: | ifrs-full_FinanceLeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of non-current finance lease liabilities. [Refer: Finance lease liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2019-01-01 -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_55&doctype=Standard&book=B -URIDate 2017-03-09 + Details
Name: | ifrs-full_NoncurrentFinanceLeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of assets recognised by the entity, which are leased under finance leases. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2019-01-01 -Name IAS -Number 17 -IssueDate 2017-01-01 -Paragraph 31 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_31_a&doctype=Standard&book=B -URIDate 2017-03-09 + Details
Name: | ifrs-full_RecognisedFinanceLeaseAsAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Finance lease amortisation period + References No definition available. + Details
Name: | tx_Financeleaseamortisationperiod
Namespace Prefix: | tx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Finance lease term + References No definition available. + Details
Name: | tx_Financeleaseterm
Namespace Prefix: | tx_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfAssetsAxis=tx_PropertyPlantEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |