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II. Accounting Policies (Details Textual)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
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      
Impairment loss on equity method investment in non-consolidated companies 0 $ 0 $ 0  
Additional Amortization Expenses 11,100      
Total intangible assets and goodwill 1,429,056 1,561,559    
Research and development expense 41,800 61,100 63,400  
Selling, general and administrative expenses, amortization of intangible assets $ 82,355 $ 41,967 $ 206,672  
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 $ 1.00 $ 1.00 $ 1.00  
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  
Net defined benefit liability (asset) at end of period $ 82,400 $ 99,000    
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 $ 108,700 119,900    
ITALY        
Disclosure of associates [line items]        
Net defined contribution plan liability (asset) at end of period 17,300      
UNITED STATES        
Disclosure of associates [line items]        
Net defined contribution plan liability (asset) at end of period 13,600      
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 36,900      
Funded post-employment benefits [member]        
Disclosure of associates [line items]        
Net defined benefit liability (asset) at end of period 176,309 160,412 $ 146,885  
Funded post-employment benefits [member] | Canada [member]        
Disclosure of associates [line items]        
Net defined contribution plan liability (asset) at end of period 10,600      
Information system projects [member]        
Disclosure of associates [line items]        
Total intangible assets and goodwill 59,993 68,533    
Licenses, patents, trademarks, and proprietary technology [member]        
Disclosure of associates [line items]        
Total intangible assets and goodwill 86,700 86,700 $ 86,700  
Customer-related intangible assets [member]        
Disclosure of associates [line items]        
Total intangible assets and goodwill $ 115,126 $ 82,811    
Customer-related intangible assets [member] | Maverick acquisition [member]        
Disclosure of associates [line items]        
Finite-lived intangible asset, useful life (Year) 14 years      
Remaining amortisation period of intangible assets material to entity (Year)     0 years 2 years
Selling, general and administrative expenses, amortization of intangible assets     $ 109  
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      
Finite-lived intangible asset, residual value $ 63,800      
Finite-lived intangible asset, residual useful life (Year) 7 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 $ 51,300      
Finite-lived intangible asset, residual useful life (Year) 2 years      
Top of range [member]        
Disclosure of associates [line items]        
Discount rate used in current estimate of value in use 13.60%      
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 8.00%      
Global Pipe Company [Member]        
Disclosure of associates [line items]        
Number of Board Members 5      
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 Shareholders Agreement 1      
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] | CONFAB INDUSTRIAL S.A. and subsidiaries [member]        
Disclosure of associates [line items]        
Proportion of voting rights held in associate 5.19% 5.19%    
Usiminas [member] | Ternium S.A. [member]        
Disclosure of associates [line items]        
Proportion of ownership interest in associate 5.19%      
Proportion of voting rights held in associate 3.07%      
Usiminas [member] | Ternium S.A. [member] | Preference shares [member]        
Disclosure of associates [line items]        
Number of shares subscribed to (in shares) | shares 1,300,000      
Usiminas [member] | Ternium S.A. [member] | Ordinary shares [member]        
Disclosure of associates [line items]        
Number of shares subscribed to (in shares) | shares 36,500,000