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Accounting Policies (Details Textual)
R$ / shares in Units, $ / shares in Units, $ in Thousands, R$ in Millions
 12 Months Ended
Jan. 01, 2018
USD ($)
Jan. 16, 2012
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Jan. 01, 2019
USD ($)
Apr. 10, 2018
shares
May 31, 2016
USD ($)
shares
May 31, 2016
BRL (R$)
R$ / shares
shares
Apr. 30, 2016
USD ($)
shares
Apr. 30, 2016
BRL (R$)
R$ / shares
shares
Statement Line Items [Line Items]                      
Current trade receivables, effect of new accounting standard $ 6,423                    
Number of major business segments     1                
Number of reportable operating segments     1                
Intangible assets and goodwill at end of period     $ 1,465,965 $ 1,660,859              
Research and development expense     63,400 63,700 $ 68,600            
Selling, general and administrative expenses, amortization of intangible assets     $ 206,672 $ 188,550 $ 241,238            
Number of shares authorised | shares     2,500,000,000 2,500,000,000 2,500,000,000            
Par value per share | $ / shares     $ 1 $ 1 $ 1            
Total number of shares issued | shares     1,180,536,830 1,180,536,830 1,180,536,830            
Number of shares outstanding at end of period | 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     $ 91,200 $ 79,200              
Employee benefits, unit vesting period     4 years                
Employee benefits, company redemtpion period     10 years                
Employee benefits, early redemption period     7 years                
Carrying value of units granted     $ 106,000 94,800              
Dilutive effect of share options on number of ordinary shares | shares     0                
ITALY                      
Statement Line Items [Line Items]                      
Net defined contribution plan liability (asset) at end of period     $ 17,300                
Unfunded defined benefit employee retirement plan for certain senior officers [member]                      
Statement Line Items [Line Items]                      
Net defined benefit liability (asset) at end of period     41,200                
Funded post-employment benefits [member]                      
Statement Line Items [Line Items]                      
Net defined benefit liability (asset) at end of period     146,885 165,485 $ 159,612            
Funded post-employment benefits [member] | CANADA                      
Statement Line Items [Line Items]                      
Net defined benefit liability (asset) at end of period     8,200                
Funded post-employment benefits [member] | UNITED STATES                      
Statement Line Items [Line Items]                      
Net defined benefit liability (asset) at end of period     13,700                
Information system projects [member]                      
Statement Line Items [Line Items]                      
Intangible assets and goodwill at end of period     66,638 81,746              
Trademarks [member]                      
Statement Line Items [Line Items]                      
Intangible assets and goodwill at end of period     86,700                
Customer-related intangible assets [member]                      
Statement Line Items [Line Items]                      
Intangible assets and goodwill at end of period     $ 19,878 $ 193,415              
Customer-related intangible assets [member] | Maverick acquisition [member]                      
Statement Line Items [Line Items]                      
Finite-lived intangible asset, useful life     14 years                
Remaining amortisation period of intangible assets material to entity     0 2              
Selling, general and administrative expenses, amortization of intangible assets     $ 109,000                
Finite-lived intangible asset, residual value     $ 19,900                
Finite-lived intangible asset, residual useful life     2 years                
Customer-related intangible assets [member] | Hydrill acquisition [member]                      
Statement Line Items [Line Items]                      
Finite-lived intangible asset, useful life     10 years                
Top of range [member]                      
Statement Line Items [Line Items]                      
Discount rate used in current estimate of value in use     11.70%                
Top of range [member] | Information system projects [member]                      
Statement Line Items [Line Items]                      
Finite-lived intangible asset, useful life     3 years                
Top of range [member] | Licenses, patents, trademarks, and proprietary technology [member]                      
Statement Line Items [Line Items]                      
Finite-lived intangible asset, useful life     10 years                
Bottom of range [member]                      
Statement Line Items [Line Items]                      
Discount rate used in current estimate of value in use     8.70%                
Usiminas [member] | The new SHA [member]                      
Statement Line Items [Line Items]                      
Shares bound to SHA | shares             483,600,000        
Percent of company voting capital             68.60%        
T/T Group [member] | The new SHA [member]                      
Statement Line Items [Line Items]                      
Percent of company voting capital             47.10%        
Ternium entitites [member] | The new SHA [member]                      
Statement Line Items [Line Items]                      
Percent of company voting capital             39.50%        
Confab [member] | The new SHA [member]                      
Statement Line Items [Line Items]                      
Percent of company voting capital             7.60%        
NSSMC [member] | The new SHA [member]                      
Statement Line Items [Line Items]                      
Percent of company voting capital             45.90%        
Previdencia Usiminas [member] | The new SHA [member]                      
Statement Line Items [Line Items]                      
Percent of company voting capital             7.00%        
Ternium s.a. [member] | Techgen s.a. [member]                      
Statement Line Items [Line Items]                      
Proportion of ownership interest in joint venture     48.00%                
Tecpetrol International S.A. [member] | Techgen s.a. [member]                      
Statement Line Items [Line Items]                      
Proportion of ownership interest in joint venture     30.00%                
Tenaris [member] | Techgen s.a. [member]                      
Statement Line Items [Line Items]                      
Proportion of ownership interest in joint venture     22.00%                
Ternium s.a. [member]                      
Statement Line Items [Line Items]                      
Proportion of ownership interest in associate     11.46%                
Ternium s.a. [member]                      
Statement Line Items [Line Items]                      
Proportion of ownership interest in associate     11.46%                
Impairment loss on equity method investment in non-consolidated companies     $ 0 $ 0 $ 0            
Usiminas [member] | Preference shares [member]                      
Statement Line Items [Line Items]                      
Interest in associate, shares owned | shares     1,300,000                
Usiminas [member] | Ordinary shares [member]                      
Statement Line Items [Line Items]                      
Interest in associate, shares owned | shares     36,500,000                
Usiminas [member] | CONFAB INDUSTRIAL S.A. and subsidiaries [member]                      
Statement Line Items [Line Items]                      
Proportion of ownership interest in associate     3.07%                
Proportion of voting rights held in associate     5.20% 5.20%              
Usiminas [member] | CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Preference shares [member]                      
Statement Line Items [Line Items]                      
Number of shares subscribed to | shares                   1,300,000 1,300,000
Shares subscribed to, price per share | R$ / shares                     R$ 1.28
Shares subscribed to, value                   $ 500 R$ 1.6
Usiminas [member] | CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Ordinary shares [member]                      
Statement Line Items [Line Items]                      
Number of shares subscribed to | shares               11,500,000 11,500,000    
Shares subscribed to, price per share | R$ / shares                 R$ 5    
Shares subscribed to, value               $ 16,600 R$ 57.5    
Usiminas [member] | Ternium s.a. [member]                      
Statement Line Items [Line Items]                      
Proportion of ownership interest in associate   13.80%                  
Proportion of voting rights held in associate   27.70%                  
Adoption of new accouting pronoucements [member]                      
Statement Line Items [Line Items]                      
Right-of-use assets           $ 260,000          
Total lease liabilities           $ 260,000          
IFRS 15 [member]                      
Statement Line Items [Line Items]                      
Aggregate Impact on Revenues Cost of Sales and Selling Expenses (700)                    
IFRS 9 [member]                      
Statement Line Items [Line Items]                      
Current trade receivables, effect of new accounting standard $ (6,400)