BASIS OF PRESENTATION (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018	Dec. 31, 2015
Disclosure of subsidiaries [line items]
Net sales	$ 11,454,807	$ 9,700,296	$ 7,223,975
Assets	12,547,862	12,122,566
Liabilities	5,063,286	6,269,795
Equity	7,484,576	5,852,771	$ 5,166,593	$ 6,543,604	$ 4,802,997
Ternium Argentina S.A.
Disclosure of subsidiaries [line items]
Net sales	1,959,000	2,301,000
Profit (loss) from continuing operations attributable to non-controlling interests	254,000	337,000
Assets	3,184,000	2,820,000
Liabilities	606,000	874,000
Equity	$ 2,578,000	$ 1,945,000

The amount of residual interest in the assets of the entity after deducting all its liabilities.

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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