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OTHER LIABILITIES - NON CURRENT AND CURRENT (Schedule of Fair Value of Plan Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset) - beginning balance $ 405,018  
Expected return on assets (42,882) $ 0
Net defined benefit liability (asset) - ending balance 673,453 405,018
Non-US government securities 1,054,671 0
Fixed income 99,602 0
Investments funds 241,481 0
Others 64,757 0
At the end of the year 1,525,330 0
Usiminas    
Disclosure of net defined benefit liability (asset) [line items]    
Usiminas shares 64,819 0
Fair value of plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset) - beginning balance 0 0
Acquisition of business (note 3) 1,462,147 0
Expected return on assets 42,882 0
Interest income 142,529 0
Translation differences (5,933) 0
Contributions paid 14,848 0
Funding of the plan (131,143) 0
Net defined benefit liability (asset) - ending balance $ (1,525,330) $ 0