DERIVATIVE FINANCIAL INSTRUMENTS (Net Fair Value) (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Disclosure of detailed information about hedging instruments [line items]
Contracts with positive fair value	$ 1,760,403	$ 2,062,207
Contracts with negative fair value	(1,081)	(50,342)
Derivative financial instruments
Disclosure of detailed information about hedging instruments [line items]
Contracts with positive fair value	42,581	4,483
Derivative financial instruments
Disclosure of detailed information about hedging instruments [line items]
Contracts with negative fair value	(1,081)	(50,342)
Commodities contracts \| Derivative financial instruments
Disclosure of detailed information about hedging instruments [line items]
Contracts with positive fair value	29	169
Commodities contracts \| Derivative financial instruments
Disclosure of detailed information about hedging instruments [line items]
Contracts with negative fair value	(1,032)	(85)
Foreign exchange contracts \| Derivative financial instruments
Disclosure of detailed information about hedging instruments [line items]
Contracts with positive fair value	42,552	4,314
Foreign exchange contracts \| Derivative financial instruments
Disclosure of detailed information about hedging instruments [line items]
Contracts with negative fair value	$ (49)	$ (50,257)

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

No definition available.

+ Details

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

- Definition

The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2025-01-01
-Paragraph 25
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_25&doctype=Standard
-URIDate 2025-03-27

+ Details

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

- Definition

The fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

+ References

+ Details

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

- Details

Name:	ifrs-full_ClassesOfFinancialAssetsAxis=ifrs-full_DerivativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialLiabilitiesAxis=ifrs-full_DerivativesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=tx_CommodityContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_HedgingInstrumentsAxis=tx_ForeignExchangeContractsFinancialInstrumentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: