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Note 9 - Property, Plant and Equipment, Net (Details Textual) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Statement Line Items [Line Items] |  |
Property, plant and equipment, capitalized interest | $ 35.4 | $ 37.4

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
- References No definition available. + Details
Name: | ts_StatementLineItems
Namespace Prefix: | ts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration