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v3.19.1

Accounting Policies - Estimated Useful Lives of Property, Plant and Equipment (Details) - Bottom of range [member] | 12 Months Ended
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Dec. 31, 2018
Buildings and improvements [member] |
Statement Line Items [Line Items] |
Property, plant and equipment (Year) | 3050 years
Plant and production equipment [member] |
Statement Line Items [Line Items] |
Property, plant and equipment (Year) | 1040 years
Vehicles, furniture and fixtures, and other equipment [member] |
Statement Line Items [Line Items] |
Property, plant and equipment (Year) | 410 years

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

X
- Definition Represents the useful lives or depreciation rates used for property, plant and equipment. + References No definition available. + Details
Name: | ts_UsefulLivesPropertyPlantAndEquipment
Namespace Prefix: | ts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ts_BuildingsAndImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ts_PlantAndProductionEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ts_VehiclesFurnitureAndFixturesAndOtherEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |