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DOCUMENT AND ENTITY INFORMATION DOCUMENT AND ENTITY INFORMATION
 12 Months Ended
Dec. 31, 2017
shares
Document Information [Abstract]  
Entity Registrant Name TERNIUM S.A..
Entity Central Index Key 0001342874
Current Fiscal Year End Date --12-31
Entity Filer Category Large Accelerated Filer
Document Type 20-F
Document Period End Date Dec. 31, 2017
Document Fiscal Year Focus 2017
Document Fiscal Period Focus FY
Amendment Flag false
Entity Common Stock, Shares Outstanding 2,004,743,442
Entity Well-known Seasoned Issuer Yes
Entity Voluntary Filers No
Entity Current Reporting Status Yes