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CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS CONTINGENCIES, COMMITMENTS AND RESTRICTIONS ON THE DISTRIBUTION OF PROFITS (Commitments) (Details)
m³ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
MWh
Apr. 24, 2017
MWh
Dec. 20, 2000
electrical_plant
Dec. 31, 2017
USD ($)
MWh
t
m³
Dec. 31, 2006
MWh
distributor
Dec. 31, 2016
USD ($)
Disclosure of contingent liabilities [line items]            
Borrowings $ 3,221,907,000     $ 3,221,907,000   $ 1,218,635,000
Dividend payables $ 3,100,000,000     $ 3,100,000,000    
Tenaris            
Disclosure of contingent liabilities [line items]            
Minimum mass required (tons per hour) | t       250    
Techgen S.A. de C.V.            
Disclosure of contingent liabilities [line items]            
Long-term contract for purchase of electric power, term   25 years        
Long-term contract for purchase of electric power, electrical demand | MWh   699        
Percentage of electricity needs supplied   78.00%        
Ternium Mexico S.A. de C.V.            
Disclosure of contingent liabilities [line items]            
Number of electrical plants | electrical_plant     4      
Iberdrola Energia Monterey, S.A. de C.V.            
Disclosure of contingent liabilities [line items]            
Long-term contract for purchase of electric power, term     25 years      
Long-term contract for purchase of electric power, electrical demand | MWh 51.7     111.2    
Percentage of electricity needs supplied       25.00%    
Long-term contract for purchase of electric power, credit (per megawatt)       $ 750,000    
Long-term contract for purchase of electric power, credit       83,400,000    
Long-term contract for purchase of electric power, discount       $ 15,000,000    
Long-term contract for purchase of electric power, length that rates are similar to previous term       1 year    
Long-term contract for purchase of electric power, percentage discount on contract       2.50%    
Tractebel Energia de Monterrey, S. de R.L. de C.V.            
Disclosure of contingent liabilities [line items]            
Long-term contract for purchase of electric power, contracted amount       $ 8,800,000.0    
Gas Industrial de Monterrey, S.A. de C.V.            
Disclosure of contingent liabilities [line items]            
Guarantor obligations, borrowing outstanding $ 40,400,000     40,400,000    
Guarantor obligations, current carrying value 12,800,000     12,800,000    
Kinder Morgan Gas            
Disclosure of contingent liabilities [line items]            
Guarantor obligations, borrowing outstanding 265,000,000     265,000,000    
Ternium Brasil Ltda.            
Disclosure of contingent liabilities [line items]            
Long-term contract for purchase of electric power, term         15 years  
Long-term contract for purchase of electric power, electrical demand | MWh         200  
Number of distributors | distributor         24  
GE Global Parts and Products GMBH, General Electric International Inc. and Alstom Energia Térmica e Indústria Ltda.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount       $ 190,700,000    
Long-term purchase commitment, period for maintenance services of turbines       20 years    
Primetals Technologies Brazil Ltda.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount       $ 53,000,000    
Air Liquide Brasil Ltda., AirSteel Ltda., White Martins Gases Industriais Ltda., White Martins Steel Ltda. and ThyssenKrupp MinEnergy GmbH            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount       $ 55,000,000    
Companhia Distribuidora de Gás do Rio de Janeiro            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, minimum percentage of volume required       85.00%    
Long-term purchase commitment, amount       $ 33,900,000    
Long-term purchase commitment, volume | m³       61.3    
Public utilities inventory, fuel | Air Liquide Argentina S.A.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount       $ 30,900,000    
Iron Ore, Pellets and Iron Ore Fines | Ternium Argentina S.A.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, minimum percentage of volume required       80.00%    
Long-term purchase commitment, amount       $ 844,000,000    
Iron Ore, Pellets and Iron Ore Fines | Vale S.A.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, total purchased volume | t       8,000,000    
Freight Services            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, minimum quantity required (per month) | t       200,000    
Long-term purchase commitment, quantity required | t       1,200,000    
Freight Services | Ferrocarril Mexicano, S. A. de C. V.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, period       5 years    
Long-term purchase commitment, period to make investments to improve loading and unloading of gondolas       36 months    
Ternium S.A. | Kinder Morgan Gas            
Disclosure of contingent liabilities [line items]            
Guarantor obligations, borrowing outstanding 127,000,000     $ 127,000,000    
Guarantor obligations, percentage       48.00%    
Techgen S.A. de C.V. | Syndicated Loan            
Disclosure of contingent liabilities [line items]            
Borrowings 800,000,000     $ 800,000,000    
Borrowings outstanding 720,000,000     720,000,000    
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee            
Disclosure of contingent liabilities [line items]            
Guarantor obligations,outstanding $ 346,000,000     $ 346,000,000    
Techgen S.A. de C.V. | Syndicated Loan | Financial Guarantee            
Disclosure of contingent liabilities [line items]            
Guarantor obligations, percentage       48.00%    
Scenario one | Ternium Argentina S.A.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, minimum percentage of volume required       80.00%    
Long-term purchase commitment, percentage of penalty       7.00%    
Scenario one | Bottom of range | Ternium Argentina S.A.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, percentage of total volume actually operated       70.00%    
Scenario one | Top of range | Ternium Argentina S.A.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, percentage of total volume actually operated       75.00%    
Scenario two | Ternium Argentina S.A.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, minimum percentage of volume required       80.00%    
Long-term purchase commitment, percentage of penalty       15.00%    
Scenario two | Bottom of range | Ternium Argentina S.A.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, percentage of total volume actually operated       70.00%    
Forecast | Tenaris            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount       $ 11,400,000    
Forecast | Natural Gas | Ternium Argentina S.A.            
Disclosure of contingent liabilities [line items]            
Long-term purchase commitment, amount       $ 18,600,000