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BASIS OF PRESENTATION (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 07, 2015
Jan. 20, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of subsidiaries [line items]            
Revenue     $ 9,700,296 $ 7,223,975 $ 7,877,449  
Assets     12,122,566 8,322,870    
Liabilities     6,269,795 3,156,277    
Equity     5,852,771 5,166,593 $ 4,802,997 $ 5,634,703
Decrease through changes in ownership interests in subsidiaries that do not result in loss of control, equity attributable to owners of parent [1],[2],[3] $ 29,600          
Ternium Argentina S.A.            
Disclosure of subsidiaries [line items]            
Revenue     2,301,000 1,892,000    
Profit (loss) from continuing operations attributable to non-controlling interests     337,000 251,000    
Assets     2,820,000 2,415,000    
Liabilities     874,000 607,000    
Equity     $ 1,945,000 $ 1,807,000    
Ferrasa S.A.S.            
Disclosure of subsidiaries [line items]            
Proportion of ownership interest acquired   46.00%        
Consideration paid (received)   $ 74,000        
Ferrasa Panamá, S.A.            
Disclosure of subsidiaries [line items]            
Consideration paid (received)   $ 2,000        
Proportion of ownership interest sold   54.00%        
[1] Corresponds to the acquisition on the non-controlling interest in Ternium Colombia S.A.S. (formerly Ferrasa S.A.S.). See note 2.b
[2] Include mainly legal reserve under Luxembourg law for USD 200.5 million, undistributable reserves under Luxembourg law for USD 1.4 billion, hedge accounting reserve, net of tax effect, for USD (0.1) million and reserves related to the acquisition of non-controlling interest in subsidiaries for USD (88.5) million.
[3] Shareholders’ equity is determined in accordance with accounting principles generally accepted in Luxembourg