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THE COVID-19 PANDEMIC AND ITS IMPACT ON TERNIUM - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Unusual or Infrequent Items, or Both, Disclosure1 [Abstract] |  |  |
Cash flows from (used in) operating activities | $ 1,761,246 | $ 1,647,619 | $ 1,739,265
Capital expenditures | 560,013 | $ 1,052,252 | $ 520,250
Net debt | $ 371,000 |  |

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