v3.26.1
Note 11 - Property, plant and equipment, net - Components of Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year $ 6,121,471 $ 6,078,179
Movements of the year    
Currency translation adjustment 71,934 (36,248)
Increase due to business combinations [1] 16,342  
Changes due to business combinations [2]   (10,461)
Additions 568,421 635,513
Transfers / Reclassifications 906 (4,546)
Decrease due to deconsolidation of subsidiaries [3] (373)  
Disposals / Consumptions (71,942) [4] (31,763)
Depreciation charge (501,677) (509,203)
Movements of the year 83,611 43,292
At the end of the year 6,205,082 6,121,471
Land and civil buildings [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 757,410 725,063
Movements of the year    
Currency translation adjustment 8,279 (4,637)
Increase due to business combinations [1] 1,990  
Changes due to business combinations [2]   12,949
Additions 2,176
Transfers / Reclassifications 83,893 48,322
Decrease due to deconsolidation of subsidiaries [3]  
Disposals / Consumptions (57,445) [4] (10,197)
Depreciation charge (14,728) (16,266)
Movements of the year 21,989 32,347
At the end of the year 779,399 757,410
Industrial buildings, plant and production equipment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 4,873,502 4,842,229
Movements of the year    
Currency translation adjustment 56,463 (26,793)
Increase due to business combinations [1] 14,352  
Changes due to business combinations [2]   (24,063)
Additions 3,164 1,028
Transfers / Reclassifications 464,662 550,891
Decrease due to deconsolidation of subsidiaries [3] (362)  
Disposals / Consumptions (818) [4] (12,526)
Depreciation charge (464,041) (457,264)
Movements of the year 73,420 31,273
At the end of the year 4,946,922 4,873,502
Vehicles, furniture and fixtures [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 73,562 65,604
Movements of the year    
Currency translation adjustment 640 (266)
Increase due to business combinations [1]  
Changes due to business combinations [2]  
Additions 598 433
Transfers / Reclassifications 39,070 29,681
Decrease due to deconsolidation of subsidiaries [3] (11)  
Disposals / Consumptions (461) [4] (1,183)
Depreciation charge (20,666) (20,707)
Movements of the year 19,170 7,958
At the end of the year 92,732 73,562
Work in progress [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 372,990 396,103
Movements of the year    
Currency translation adjustment 6,188 (4,391)
Increase due to business combinations [1]  
Changes due to business combinations [2]   653
Additions 550,901 616,218
Transfers / Reclassifications (586,719) (633,440)
Decrease due to deconsolidation of subsidiaries [3]  
Disposals / Consumptions (6,369) [4] (2,153)
Depreciation charge
Movements of the year (35,999) (23,113)
At the end of the year 336,991 372,990
Spare parts and equipment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 44,007 49,180
Movements of the year    
Currency translation adjustment 364 (161)
Increase due to business combinations [1]  
Changes due to business combinations [2]  
Additions 13,758 15,658
Transfers / Reclassifications
Decrease due to deconsolidation of subsidiaries [3]  
Disposals / Consumptions (6,849) [4] (5,704)
Depreciation charge (2,242) (14,966)
Movements of the year 5,031 (5,173)
At the end of the year 49,038 44,007
Gross carrying amount [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 15,717,716 15,313,080
Movements of the year    
At the end of the year 16,369,632 15,717,716
Gross carrying amount [member] | Land and civil buildings [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 935,704 889,957
Movements of the year    
At the end of the year 967,135 935,704
Gross carrying amount [member] | Industrial buildings, plant and production equipment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 13,903,542 13,538,273
Movements of the year    
At the end of the year 14,517,757 13,903,542
Gross carrying amount [member] | Vehicles, furniture and fixtures [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 424,042 416,913
Movements of the year    
At the end of the year 458,610 424,042
Gross carrying amount [member] | Work in progress [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 372,990 396,103
Movements of the year    
At the end of the year 336,991 372,990
Gross carrying amount [member] | Spare parts and equipment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year 81,438 71,834
Movements of the year    
At the end of the year 89,139 81,438
Accumulated depreciation, amortisation and impairment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year (9,596,245) (9,234,901)
Movements of the year    
At the end of the year (10,164,550) (9,596,245)
Accumulated depreciation, amortisation and impairment [member] | Land and civil buildings [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year (178,294) (164,894)
Movements of the year    
At the end of the year (187,736) (178,294)
Accumulated depreciation, amortisation and impairment [member] | Industrial buildings, plant and production equipment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year (9,030,040) (8,696,044)
Movements of the year    
At the end of the year (9,570,835) (9,030,040)
Accumulated depreciation, amortisation and impairment [member] | Vehicles, furniture and fixtures [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year (350,480) (351,309)
Movements of the year    
At the end of the year (365,878) (350,480)
Accumulated depreciation, amortisation and impairment [member] | Work in progress [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year
Movements of the year    
At the end of the year
Accumulated depreciation, amortisation and impairment [member] | Spare parts and equipment [member]    
Reconciliation of changes in property, plant and equipment [abstract]    
At the beginning of the year (37,431) (22,654)
Movements of the year    
At the end of the year $ (40,101) $ (37,431)
[1] For the year 2025, related to the acquisition of a scrap processing business in Beaver Falls, Pennsylvania. For more information see note 34.
[2] For the year 2024, related to Mattr’s pipe coating business unit acquisition.
[3] For the year 2025, related to the deconsolidation of Amaja Tubular Services Limited.
[4] For the year 2025, includes the unwinding of certain land plots in Saudi Arabia. For more information see note 28.