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Note 11 - Intangible Assets, Net (Details Textual) $ in Millions	Dec. 31, 2017 USD ($)
Statement Line Items [Line Items]
Goodwill at end of period	$ 1,292.0
North America [member]
Statement Line Items [Line Items]
Goodwill at end of period	1,168.5
South America [member]
Statement Line Items [Line Items]
Goodwill at end of period	121.2
Europe [member]
Statement Line Items [Line Items]
Goodwill at end of period	2.0
Middle East and Africa [member]
Statement Line Items [Line Items]
Goodwill at end of period	$ 0.7

X

- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

Name:	ifrs-full_Goodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ts_StatementLineItems
Namespace Prefix:	ts_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=ts_NorthAmerica1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=ts_SouthAmerica1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=ts_Europe1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=ts_MiddleEastAndAfricaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: