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DERIVATIVE FINANCIAL INSTRUMENTS (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2013
Disclosure of detailed information about financial instruments [line items]    
Other comprehensive loss that will be reclassified to profit or loss, before tax $ 60  
Interest rate swap contracts | Tenigal S. de R.L. de C.V.    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 6,300 $ 100,000
Derivative, average fixed interest rate   1.92%
Reserve of cash flow hedges, net of tax (40)  
Non-deliverable forward contract | Ternium Argentina S.A.    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 100,000  
Non-deliverable forward contract | Ternium Colombia S.A.S    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 87,800  
Forward contract | Ternium Mexico S.A. de C.V.    
Disclosure of detailed information about financial instruments [line items]    
Notional amount 44,000  
Forward contract | Ternium Investments S.a.r.l.    
Disclosure of detailed information about financial instruments [line items]    
Notional amount $ 12,800