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Note 9 - Property, Plant and Equipment, Net (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Statement Line Items [Line Items]
Property, plant and equipment, capitalized interest	$ 39.5	$ 37.4
Property, plant and equipment, capitalized interest rate	1.97%

X

- Definition

The amount of capitalized interest included in property, plant and equipment.

+ References

No definition available.

+ Details

Name:	ts_PropertyPlantAndEquipmentCapitalizedInterest
Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The average capitalization interest rates applied to property, plant and equipment during the period.

+ References

No definition available.

+ Details

Name:	ts_PropertyPlantAndEquipmentCapitalizedInterestRate
Namespace Prefix:	ts_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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