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INVESTMENTS IN NON-CONSOLIDATED COMPANIES (Narrative) (Details) $ / shares in Units, $ in Thousands, shares in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) $ / shares MW shares | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2018 USD ($) | Dec. 31, 2020 R$ / shares | Dec. 31, 2019 R$ / shares | Dec. 31, 2017 USD ($)
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Fair value of investments in associates for which there are quoted market prices | $ 756,300 | $ 614,100 |  |  |  |
Investments in associates | 422,900 | 486,600 |  |  |  |
Revenue | 8,735,435 | 10,192,818 | $ 11,454,807 |  |  |
Net sales | 8,735,435 | 10,192,818 | 11,454,807 |  |  |
Non-current assets | 8,289,460 | 8,757,320 |  |  |  |
Current assets | 4,566,775 | 4,178,213 |  |  |  |
Non-current liabilities | 2,559,485 | 3,452,535 |  |  |  |
Current liabilities | 1,853,597 | 1,768,125 |  |  |  |
Equity | 8,443,153 | 7,714,873 | $ 7,484,576 |  |  | $ 5,852,771
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Revenue | 3,133,000 | 3,790,000 |  |  |  |
Net sales | 3,133,000 | 3,790,000 |  |  |  |
Equity | $ 2,860,944 | 3,484,000 |  |  |  |
USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium Investments S.a r.l., Ternium Argentina and Prosid Investments S.A.I.C. |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Percentage of voting equity interests acquired | 20.40% |  |  |  |  |
Usiminas Control Group |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Percentage of voting equity interests acquired | 68.60% |  |  |  |  |
Usiminas Control Group | T/T Group |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Percentage of voting equity interests acquired | 47.10% |  |  |  |  |
Usiminas Control Group | Ternium S.A. |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Percentage of voting equity interests acquired | 39.50% |  |  |  |  |
Usiminas Control Group | TenarisConfab |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Percentage of voting equity interests acquired | 7.60% |  |  |  |  |
Usiminas Control Group | NSC Group |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Percentage of voting equity interests acquired | 45.90% |  |  |  |  |
Usiminas Control Group | Previdencia Usiminas |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Percentage of voting equity interests acquired | 7.00% |  |  |  |  |
Techgen S.A. de C.V. |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Revenue | $ 314,000 | 344,000 |  |  |  |
Number of megawatts (MW) | MW | 900 |  |  |  |  |
Net sales | $ 314,000 | 344,000 |  |  |  |
Profit (loss) from continuing operations | 44,000 | 24,000 |  |  |  |
Non-current assets | 833,000 | 875,000 |  |  |  |
Current assets | 59,000 | 48,000 |  |  |  |
Non-current liabilities | 709,000 | 791,000 |  |  |  |
Current liabilities | 95,000 | 87,000 |  |  |  |
Equity | 89,000 | $ 45,000 |  |  |  |
Subordinated liabilities | $ 127,400 |  |  |  |  |
Techgen S.A. de C.V. | Ternium S.A. |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Proportion of ownership interest in associate (percent) | 48.00% |  |  |  |  |
Proportion of ownership interest in associate's power supply (percent) | 78.00% |  |  |  |  |
Techgen S.A. de C.V. | Tecpetrol International S.A. |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Proportion of ownership interest in associate (percent) | 30.00% |  |  |  |  |
Techgen S.A. de C.V. | Ternium Investments S.a.r.l. |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Proportion of ownership interest in associate (percent) | 22.00% |  |  |  |  |
Proportion of ownership interest in associate's power supply (percent) | 22.00% |  |  |  |  |
Ordinary shares |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Share price (per share) | (per share) | $ 3.02 | $ 2.45 |  | R$ 15.69 | R$ 9.87 |
Ordinary shares | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium Investments S.a r.l., Ternium Argentina and Prosid Investments S.A.I.C. |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Number of shares outstanding (shares) | shares | 242.6 |  |  |  |  |
Ordinary shares | Usiminas Control Group |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Number of shares outstanding (shares) | shares | 483.6 |  |  |  |  |
Preferred shares |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Share price (per share) | (per share) | $ 2.81 | $ 2.36 |  | R$ 14.61 | R$ 9.51 |
Preferred shares | USINAS SIDEÚRGICAS DE MINAS GERAIS S.A. | Ternium Investments S.a r.l., Ternium Argentina and Prosid Investments S.A.I.C. |  |  |  |  |  |
Disclosure of unconsolidated structured entities [line items] |  |  |  |  |  |
Number of shares outstanding (shares) | shares | 8.5 |  |  |  |  |

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Balance Type: | credit
Period Type: | instant

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- Definition Number of megawatts + References No definition available. + Details
Name: | tx_Numberofmegawatts
Namespace Prefix: | tx_
Data Type: | num:powerItemType
Balance Type: | na
Period Type: | duration

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- Definition Proportion of ownership interest in associate's power supply + References No definition available. + Details
Name: | tx_Proportionofownershipinterestinassociatespowersupply
Namespace Prefix: | tx_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Share price + References No definition available. + Details
Name: | tx_Shareprice
Namespace Prefix: | tx_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | tx_NonConsolidatedCompaniesAxis=tx_USINASSIDERGICASDEMINASGERAISS.A.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=tx_TerniumInvestmentsS.ar.l.TerniumArgentinaandProsidInvestmentsS.A.I.C.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | tx_NonConsolidatedCompaniesAxis=tx_UsiminasControlGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=tx_TTGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=tx_TerniumS.A.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=tx_TenarisConfabMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=tx_NSCGroupMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=tx_PrevidenciaUsiminasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | tx_NonConsolidatedCompaniesAxis=tx_TechgenS.A.deC.V.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=tx_TecpetrolInternationalS.A.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_CounterpartiesAxis=tx_TerniumInvestmentsSarlMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_PreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |