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Note 10 - Property, Plant and Equipment, Net - Components of Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year $ 6,090,017 $ 6,063,908
End of the year 6,193,181 6,090,017
Land and civil buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 677,671  
End of the year 707,126 677,671
Industrial buildings, plant and production equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 5,166,678  
End of the year 5,249,425 5,166,678
Vehicles, furniture and fixtures [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 76,758  
End of the year 72,511 76,758
Construction in progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 108,308  
End of the year 102,226 108,308
Spare parts and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 60,602  
End of the year 61,893 60,602
Gross carrying amount [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 13,836,586 13,421,982
Translation differences 70,291 (43,307)
Increase due to business combinations 503,438 [1] 178,739 [2]
Additions 167,755 313,915
Disposals / Consumptions (82,416) (38,975)
Transfers / Reclassifications 2,351 4,232
End of the year 14,498,005 13,836,586
Gross carrying amount [member] | Land and civil buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 799,139 732,578
Translation differences (545) (1,611)
Increase due to business combinations 39,622 [1] 59,468 [2]
Additions 1,451 16
Disposals / Consumptions (5,964) (35)
Transfers / Reclassifications 5,881 8,723
End of the year 839,584 799,139
Gross carrying amount [member] | Industrial buildings, plant and production equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 12,468,813 12,121,569
Translation differences 72,650 (38,961)
Increase due to business combinations 440,366 [1] 115,908 [2]
Additions 1,524 1,178
Disposals / Consumptions (61,281) (27,153)
Transfers / Reclassifications 157,473 296,272
End of the year 13,079,545 12,468,813
Gross carrying amount [member] | Vehicles, furniture and fixtures [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 399,724 377,260
Translation differences 443 (1,615)
Increase due to business combinations 7,195 [1] 1,733 [2]
Additions 620 1,107
Disposals / Consumptions (8,811) (7,110)
Transfers / Reclassifications 15,586 28,349
End of the year 414,757 399,724
Gross carrying amount [member] | Construction in progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 108,308 127,378
Translation differences (2,095) (864)
Increase due to business combinations 16,255 [1] 1,630 [2]
Additions 157,315 299,412
Disposals / Consumptions (968) (2,120)
Transfers / Reclassifications (176,589) (317,128)
End of the year 102,226 108,308
Gross carrying amount [member] | Spare parts and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 60,602 63,197
Translation differences (162) (256)
Increase due to business combinations [1] [2]
Additions 6,845 12,202
Disposals / Consumptions (5,392) (2,557)
Transfers / Reclassifications (11,984)
End of the year 61,893 60,602
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 7,746,569 7,358,074
Translation differences 56,677 (26,878)
Disposals / Consumptions (64,834) (31,542)
Impairment charge (See note 5) 36,000  
Transfers / Reclassifications (127) (400)
Depreciation charge 530,539 447,315
End of the year 8,304,824 7,746,569
Accumulated depreciation, amortisation and impairment [member] | Land and civil buildings [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 121,468 110,914
Translation differences (288) (420)
Disposals / Consumptions (89) (73)
Impairment charge (See note 5)  
Transfers / Reclassifications (1) (362)
Depreciation charge 11,368 11,409
End of the year 132,458 121,468
Accumulated depreciation, amortisation and impairment [member] | Industrial buildings, plant and production equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 7,302,135 6,936,900
Translation differences 56,560 (24,973)
Disposals / Consumptions (57,897) (25,580)
Impairment charge (See note 5) 36,000  
Transfers / Reclassifications 349 (38)
Depreciation charge 492,973 415,826
End of the year 7,830,120 7,302,135
Accumulated depreciation, amortisation and impairment [member] | Vehicles, furniture and fixtures [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year 322,966 310,260
Translation differences 405 (1,485)
Disposals / Consumptions (6,848) (5,889)
Impairment charge (See note 5)  
Transfers / Reclassifications (475)
Depreciation charge 26,198 20,080
End of the year 342,246 322,966
Accumulated depreciation, amortisation and impairment [member] | Construction in progress [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year
Translation differences
Disposals / Consumptions
Impairment charge (See note 5)  
Transfers / Reclassifications
Depreciation charge
End of the year
Accumulated depreciation, amortisation and impairment [member] | Spare parts and equipment [member]    
Disclosure of detailed information about property, plant and equipment [line items]    
Beginning of the year
Translation differences
Disposals / Consumptions
Impairment charge (See note 5)  
Transfers / Reclassifications
Depreciation charge
End of the year
[1] Related to IPSCO acquisition. See note 32.
[2] Related to SSPC acquisition. See note 32.