TRADE RECEIVABLES, NET - NON CURRENT AND CURRENT (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Trade and other receivables [abstract]
Trade receivables, net – Non-current	$ 897	$ 4,766
Current accounts	920,937	1,096,072
Trade receivables with related parties	41,696	46,744
Allowance for doubtful accounts	(12,961)	(14,346)
Trade receivables, net - Current	$ 949,672	$ 1,128,470

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_AllowanceAccountForCreditLossesOfFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of current trade receivables. [Refer: Trade receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
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-IssueDate 2019-01-01
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-URIDate 2019-03-27

+ Details

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

- Definition

The amount of non-current trade receivables. [Refer: Trade receivables]

+ References

+ Details

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

- References

No definition available.

+ Details

Name:	ifrs-full_TradeAndOtherReceivablesAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Current accounts

+ References

No definition available.

+ Details

Name:	tx_Currentaccounts
Namespace Prefix:	tx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Trade receivables with related parties

+ References

No definition available.

+ Details

Name:	tx_Tradereceivableswithrelatedparties
Namespace Prefix:	tx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant