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Accounting Policies (Details Textual)
R$ / shares in Units, $ / shares in Units, $ in Thousands, R$ in Millions
 12 Months Ended
Jan. 16, 2012
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Jan. 01, 2018
USD ($)
May 31, 2016
USD ($)
shares
May 31, 2016
BRL (R$)
R$ / shares
shares
Apr. 30, 2016
USD ($)
shares
Apr. 30, 2016
BRL (R$)
R$ / shares
shares
Dec. 31, 2014
Statement Line Items [Line Items]                    
Impairment loss on equity method investment in non-consolidated companies   $ 28,884            
Number of major business segments   1                
Number of reportable operating segments   1                
Intangible assets and goodwill at end of period   $ 1,660,859 1,862,827              
Research and development expense   $ 63,700 $ 68,600 $ 89,000            
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   $ 79,200 $ 78,700              
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   $ 94,800 $ 92,900              
Percentage of total sales, bill and hold arrangements   3.30% 2.80% 3.00%            
Revenue from construction contracts   $ 11,000                
Revenue from construction contracts, percentage of total sales   0.21%                
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   $ 19,300                
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   46,800                
Funded post-employment benefits [member]                    
Statement Line Items [Line Items]                    
Net defined benefit liability (asset) at end of period   165,486 $ 159,612 $ 153,974            
Funded post-employment benefits [member] | CANADA                    
Statement Line Items [Line Items]                    
Net defined benefit liability (asset) at end of period   16,700                
Funded post-employment benefits [member] | UNITED STATES                    
Statement Line Items [Line Items]                    
Net defined benefit liability (asset) at end of period   12,300                
Information system projects [member]                    
Statement Line Items [Line Items]                    
Intangible assets and goodwill at end of period   81,746 145,957              
Trademarks [member]                    
Statement Line Items [Line Items]                    
Intangible assets and goodwill at end of period   86,700 86,700              
Customer-related intangible assets [member]                    
Statement Line Items [Line Items]                    
Intangible assets and goodwill at end of period   $ 193,415 $ 324,878              
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   2               5
Finite-lived intangible asset, residual value   $ 193,000                
Finite-lived intangible asset, residual useful life   3 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] | 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                
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   3.08% 3.08%              
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%                  
Increase (decrease) due to changes in accounting policy [member] | Retrospective changes applied after the reporting period [member]                    
Statement Line Items [Line Items]                    
Increase (decrease) in financial assets arising from change in measurement attribute, initial application of IFRS 9         $ 3,000          
Expected decrease in allowance for doubtful accounts         6,000          
Increase (decrease) due to application of IFRS 15 [member] | Retrospective changes applied after the reporting period [member]                    
Statement Line Items [Line Items]                    
Expected net increase (decrease) in revenues, cost of sales and selling expenses from adoption of a policy         $ (700)