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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
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

X

- 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

Name:	ifrs-full_DebtInstrumentsHeld
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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

X

- 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

X

- 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