INCOME TAX EXPENSE (Narrative) (Details) - USD ($) $ in Thousands |
3 Months Ended | 12 Months Ended | |||
|---|---|---|---|---|---|
Dec. 31, 2025 |
Sep. 30, 2025 |
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| Income Tax [Line Items] | |||||
| Write-down of deferred tax assets | $ 427,835 | $ 0 | $ 0 | ||
| Net deferred tax assets | $ 1,014,901 | 1,014,901 | $ 1,105,691 | $ 1,542,565 | |
| Usiminas | |||||
| Income Tax [Line Items] | |||||
| Write-down of deferred tax assets | $ 405,000 | ||||
| Net deferred tax assets, before write-down | $ 776,000 | ||||
| Net deferred tax assets | 582,000 | $ 582,000 | |||
| Las Encinas S.A. de C.V. | |||||
| Income Tax [Line Items] | |||||
| Write-down of deferred tax assets | $ 22,800 | ||||