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Note 12 - Investments in Non-consolidated Companies - Summary of Investments in Non-consolidated Companies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Statement Line Items [Line Items]
At the beginning of the year	$ 557,031		$ 490,645
Translation differences	(9,548)		3,473		$ (92,914)
From non-consolidated companies	116,140		71,533		(10,674)
Dividends and distributions received (*)	(22,971)	[1]	(20,674)	[1]	(20,674)
Additions			17,108		4,400
Decrease / increase in equity reserves and others	(358)		(5,054)
At the end of the year	$ 640,294		$ 557,031		$ 490,645
[1] Related to Ternium

X

- Definition

The cash inflow representing dividends received from associates, classified as investing activities. [Refer: Associates [member]; Dividends received]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The cash outflow for the purchase of interests in associates. [Refer: Associates [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 7
-IssueDate 2017-01-01
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- Definition

The amount of income (loss) from equity method investments in non-consolidated companies.

+ References

No definition available.

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- Definition

The amount of other comprehensive income (loss), before tax, attributable to non-consolidated companies related to exchange differences when financial statements of foreign operations are translated

+ References

No definition available.

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- Definition

The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, including dividends declared, net of tax.

+ References

No definition available.

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