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Note 11 - Intangible Assets, Net - Intangible Assets and Goodwill (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year $ 1,561,559  
Values at the end of the year 1,429,056 $ 1,561,559
Information system projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 68,533  
Values at the end of the year 59,993 68,533
Licenses, patents and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year [1] 89,970  
Values at the end of the year [1] 167,969 89,970
Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 1,320,245  
Values at the end of the year 1,085,968 1,320,245
Customer-related intangible assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 82,811  
Values at the end of the year 115,126 82,811
Gross carrying amount [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 5,326,500 5,189,988
Currency translation adjustment (3,730) (2,955)
Increase due to business combinations 526,846 [2] 114,466 [3]
Additions 25,567 36,259
Transfers / Reclassifications (1,393) (4,665)
Disposals (4,825) (6,593)
Values at the end of the year 5,868,965 5,326,500
Gross carrying amount [member] | Information system projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 604,870 580,622
Currency translation adjustment 1,108 (1,917)
Increase due to business combinations 11,563 [2] 405 [3]
Additions 24,965 35,487
Transfers / Reclassifications (1,393) (4,665)
Disposals (3,761) (5,062)
Values at the end of the year 637,352 604,870
Gross carrying amount [member] | Licenses, patents and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year [1] 463,742 464,571
Currency translation adjustment [1] 220 (70)
Increase due to business combinations [1] 87,000 [2] [3]
Additions [1] 602 772
Transfers / Reclassifications [1]
Disposals [1] (1,064) (1,531)
Values at the end of the year [1] 550,500 463,742
Gross carrying amount [member] | Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 2,117,837 2,085,936
Currency translation adjustment (5,058) (968)
Increase due to business combinations 357,183 [2] 32,869 [3]
Additions
Transfers / Reclassifications
Disposals
Values at the end of the year 2,469,962 2,117,837
Gross carrying amount [member] | Customer-related intangible assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 2,140,051 2,058,859
Currency translation adjustment
Increase due to business combinations 71,100 [2] 81,192 [3]
Additions
Transfers / Reclassifications
Disposals
Values at the end of the year 2,211,151 2,140,051
Accumulated depreciation, amortisation and impairment [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 3,764,941 3,724,023
Currency translation adjustment 889 (1,734)
Impairment charge 586,402  
Transfers / Reclassifications 931  
Disposals (3,730) (5,263)
Amortization charge 90,476 47,915
Values at the end of the year 4,439,909 3,764,941
Accumulated depreciation, amortisation and impairment [member] | Information system projects [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 536,337 513,984
Currency translation adjustment 890 (1,734)
Impairment charge  
Transfers / Reclassifications 931  
Disposals (3,730) (4,850)
Amortization charge 42,931 28,937
Values at the end of the year 577,359 536,337
Accumulated depreciation, amortisation and impairment [member] | Licenses, patents and trademarks [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year [1] 373,772 373,466
Currency translation adjustment [1] (1)
Impairment charge [1]  
Transfers / Reclassifications [1]  
Disposals [1] (413)
Amortization charge [1] 8,760 719
Values at the end of the year [1] 382,531 373,772
Accumulated depreciation, amortisation and impairment [member] | Goodwill [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 797,592 797,592
Currency translation adjustment
Impairment charge 586,402  
Transfers / Reclassifications  
Disposals
Amortization charge
Values at the end of the year 1,383,994 797,592
Accumulated depreciation, amortisation and impairment [member] | Customer-related intangible assets [member]    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Values at the beginning of the year 2,057,240 2,038,981
Currency translation adjustment
Impairment charge  
Transfers / Reclassifications  
Disposals
Amortization charge 38,785 18,259
Values at the end of the year $ 2,096,025 $ 2,057,240
[1] Includes Proprietary Technology.
[2] Related to IPSCO acquisition. See note 32.
[3] Related to SSPC acquisition. See note 32.