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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, 2024
Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset) - beginning balance $ 673,453  
Expected return on assets 177,519 $ (42,882)
Net defined benefit liability (asset) - ending balance 573,834 673,453
Non-US government securities 716,909 1,054,671
Fixed income 81,821 99,602
Investments funds 202,987 241,481
Others 1,334 64,757
At the end of the year 1,032,356 1,525,330
Usiminas    
Disclosure of net defined benefit liability (asset) [line items]    
Usiminas shares 29,305 64,819
Fair value of plan assets    
Disclosure of net defined benefit liability (asset) [line items]    
Net defined benefit liability (asset) - beginning balance (1,525,330) 0
Acquisition of business 0 1,462,147
Expected return on assets (177,519) 42,882
Interest income 109,350 142,529
Translation differences (330,283) (5,933)
Contributions paid 13,111 14,848
Funding of the plan (107,633) (131,143)
Net defined benefit liability (asset) - ending balance $ (1,032,356) $ (1,525,330)