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Note 31 - Related party transactions - Transactions Carried Out With Related Parties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of transactions between related parties [line items]      
Revenue, related party transactions $ 252,336 $ 289,083 $ 362,629
Purchases of goods and services, related party transactions 321,783 548,763 758,443
Income from joint ventures in related party transactions 6,218 5,645 3,804
Amounts receivable (payable), related party transactions 83,857 73,088  
Finance lease liabilities from associated companies (1,026) (1,459)  
Finance lease liabilities from other related parties (260) (375)  
Financial debt related parties (1,286) (1,834)  
Techint Holdings S.àr.l. [Member]      
Disclosure of transactions between related parties [line items]      
Dividend distributed related party transactions 478,115 385,347 321,122
Associates [member]      
Disclosure of transactions between related parties [line items]      
Sales of goods to related parties 37,551 56,152 100,019
Sales of services to related parties 3,456 1,564 1,472
Purchases of goods to related parties 154,772 324,556 555,257
Purchases of services to related parties 17,544 13,349 13,759
Divicend received related party transactions 71,211 69,216 64,189
Receivables from non-consolidated parties 3,133 7,589  
Payables to non-consolidated parties (23,531) (21,012)  
Third party [member]      
Disclosure of transactions between related parties [line items]      
Sales of goods to related parties 83,250 121,679 151,884
Sales of services to related parties 127,940 109,553 109,123
Purchases of goods to related parties 70,425 61,366 51,040
Purchases of services to related parties 55,576 76,751 36,767
Receivables from non-consolidated parties 47,713 62,986  
Payables to non-consolidated parties (12,165) (11,488)  
Joint ventures where entity is venturer [member]      
Disclosure of transactions between related parties [line items]      
Sales of services to related parties 139 135 131
Purchases of goods to related parties 23,466 72,741 101,620
Income from joint ventures in related party transactions 6,218 5,645 $ 3,804
Receivables from non-consolidated parties 68,759 63,374  
Payables to non-consolidated parties $ (52) $ (28,361)