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II. Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
$ / shares
shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2017
Disclosure of associates [line items]        
Goodwill or intangible assets recognized in relation to investments in non consolidated companies under the equity method $ 0      
Number of major business segments 1      
Additional amortization expenses     $ 11,100  
Total intangible assets and goodwill $ 1,332,508 $ 1,372,176    
Research and development expense 50,700 45,300 41,800  
Selling, general and administrative expenses, amortization of intangible assets $ 59,018 $ 63,874 $ 82,355  
Discount rate used in current estimate of value in use 13.50%      
Number of shares authorised (in shares) | shares 2,500,000,000 2,500,000,000 2,500,000,000  
Par value per share (in dollars per share) | $ / shares $ 1 $ 1 $ 1  
Total number of shares issued (in shares) | shares 1,180,536,830 1,180,536,830 1,180,536,830  
Number of shares outstanding at end of period (in shares) | shares 1,180,536,830 1,180,536,830 1,180,536,830  
Number of votes, per share 1 1 1  
Employee benefits, unit vesting period (Year)       4 years
Employee benefits, company redemption period (Year) 7 years     10 years
Employee benefits, early redemption period (Year)       7 years
Carrying value of units granted $ 123,900 $ 99,600    
Dilutive effect of share options on number of ordinary shares (in shares) | shares 0      
Period of lease term of short-term leases 12 months      
Forecast period of cash flow projections 5 years      
Nominal growth rate 2.00%      
Maximum maturity period of fair value through other comprehensive income instruments for short-term nature 12 months      
Other current Non-current benefits $ 94,400 84,200    
Italy        
Disclosure of associates [line items]        
Net defined benefit liability (asset) at end of period 10,700      
Canada        
Disclosure of associates [line items]        
Net defined contribution plan liability (asset) at end of period 10,400      
USA        
Disclosure of associates [line items]        
Net defined contribution plan liability (asset) at end of period 7,100      
Unfunded defined benefit employee retirement plan for certain senior officers [member]        
Disclosure of associates [line items]        
Net defined benefit liability (asset) at end of period 43,100      
Information system projects [member]        
Disclosure of associates [line items]        
Total intangible assets and goodwill 53,355 50,848    
Licenses, patents, trademarks, and proprietary technology [member]        
Disclosure of associates [line items]        
Total intangible assets and goodwill   86,700    
Customer-related intangible assets [member]        
Disclosure of associates [line items]        
Total intangible assets and goodwill $ 41,527 $ 80,380    
Customer-related intangible assets [member] | Maverick acquisition [member]        
Disclosure of associates [line items]        
Finite-lived intangible asset, useful life (Year) 14 years      
Customer-related intangible assets [member] | Hydrill acquisition [member]        
Disclosure of associates [line items]        
Finite-lived intangible asset, useful life (Year) 10 years      
Customer-related intangible assets [member] | Saudi Steel Pipe Company [member]        
Disclosure of associates [line items]        
Finite-lived intangible asset, useful life (Year) 9 years      
Selling, general and administrative expenses, amortization of intangible assets $ 4,100      
Finite-lived intangible asset, residual useful life (Year) 3 years      
Finite-lived intangible asset, reviewed useful life (Year) 5 years      
Intangible assets other than goodwill, useful life (Year) 3 years      
Customer-related intangible assets [member] | Ipsco Tubulars Inc [Member]        
Disclosure of associates [line items]        
Finite-lived intangible asset, useful life (Year) 3 years      
Finite-lived intangible asset, residual value $ 41,500      
Top of range [member]        
Disclosure of associates [line items]        
Discount rate used in current estimate of value in use 20.20%      
Percentage of voting rights held in unconsolidated entities 50.00%      
Top of range [member] | Information system projects [member]        
Disclosure of associates [line items]        
Finite-lived intangible asset, useful life (Year) 3 years      
Top of range [member] | Licenses, patents, trademarks, and proprietary technology [member]        
Disclosure of associates [line items]        
Finite-lived intangible asset, useful life (Year) 10 years      
Bottom of range [member]        
Disclosure of associates [line items]        
Discount rate used in current estimate of value in use 13.40%      
Percentage of voting rights held in unconsolidated entities 20.00%      
Bottom of range [member] | Licenses, patents, trademarks, and proprietary technology [member]        
Disclosure of associates [line items]        
Finite-lived intangible asset, useful life (Year) 3 years      
Global Pipe Company [Member] | Saudi Steel Pipe Company [member]        
Disclosure of associates [line items]        
Proportion of ownership interest in joint venture 35.00%      
Number of Board members can be appointed through the shareholders agreement 4      
Number of Board members 11      
Usiminas [member] | The new SHA [member]        
Disclosure of associates [line items]        
Shares bound to SHA (in shares) | shares 483,600,000      
Percent of company voting capital 68.60%      
T/T Group [member] | The new SHA [member]        
Disclosure of associates [line items]        
Percent of company voting capital 47.10%      
Ternium entitites [member] | The new SHA [member]        
Disclosure of associates [line items]        
Percent of company voting capital 39.50%      
Confab [member] | The new SHA [member]        
Disclosure of associates [line items]        
Percent of company voting capital 7.60%      
NSSMC [member] | The new SHA [member]        
Disclosure of associates [line items]        
Percent of company voting capital 45.90%      
Previdencia Usiminas [member] | The new SHA [member]        
Disclosure of associates [line items]        
Percent of company voting capital 7.00%      
Ternium S.A. [member] | Techgen s.a. [member]        
Disclosure of associates [line items]        
Proportion of ownership interest in joint venture 48.00%      
Tecpetrol International S.A. [member] | Techgen s.a. [member]        
Disclosure of associates [line items]        
Proportion of ownership interest in joint venture 30.00%      
Tenaris [member] | Techgen s.a. [member]        
Disclosure of associates [line items]        
Proportion of ownership interest in joint venture 22.00%      
Ternium S.A. [member]        
Disclosure of associates [line items]        
Proportion of ownership interest in associate 11.46%      
Usiminas [member]        
Disclosure of associates [line items]        
Proportion of ownership interest in associate 3.07%      
Proportion of voting rights held in associate 5.19%      
Forecast period of cash flow projections 5 years      
Nominal growth rate 2.00%      
Usiminas [member] | Preference shares [member]        
Disclosure of associates [line items]        
Number of shares subscribed to (in shares) | shares 1,300,000      
Usiminas [member] | Ordinary shares [member]        
Disclosure of associates [line items]        
Number of shares subscribed to (in shares) | shares 36,500,000