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Note 31 - Related party transactions - Transactions Carried Out With Related Parties (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of transactions between related parties [line items]      
Revenue, related party transactions $ 289,083 $ 362,629 $ 198,908
Purchases of goods and services, related party transactions 548,763 758,443 350,951
Income from joint ventures in related party transactions 5,645 3,804 2,867
Amounts receivable (payable), related party transactions 73,088 (8,006)  
Finance lease liabilities from associated companies (1,459) (1,650)  
Finance lease liabilities from other related parties (375) (483)  
Financial debt related parties (1,834) (2,133)  
Techint Holdings S.àr.l. [Member]      
Disclosure of transactions between related parties [line items]      
Dividend distributed related party transactions 385,347 321,122 192,673
Associates [member]      
Disclosure of transactions between related parties [line items]      
Sales of goods to related parties 56,152 100,019 71,879
Sales of services to related parties 1,564 1,472 1,164
Purchases of goods to related parties 324,556 555,257 225,319
Purchases of services to related parties 13,349 13,759 9,763
Divicend received related party transactions 69,216 64,189 78,926
Receivables from non-consolidated parties 7,589 9,012  
Payables to non-consolidated parties (21,012) (113,738)  
Other related parties [member]      
Disclosure of transactions between related parties [line items]      
Sales of goods to related parties 121,679 151,884 76,467
Sales of services to related parties 109,553 109,123 49,268
Purchases of goods to related parties 61,366 51,040 32,453
Purchases of services to related parties 76,751 36,767 13,806
Receivables from non-consolidated parties 62,986 78,370  
Payables to non-consolidated parties (11,488) (13,283)  
Joint ventures where entity is venturer [member]      
Disclosure of transactions between related parties [line items]      
Sales of services to related parties 135 131 130
Purchases of goods to related parties 72,741 101,620 69,610
Income from joint ventures in related party transactions 5,645 3,804 $ 2,867
Receivables from non-consolidated parties 63,374 60,123  
Payables to non-consolidated parties $ (28,361) $ (28,490)