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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