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Note 11 - Right-of-use Assets, Net and Lease Liabilities - Evolution of Right-of-use Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Cost |  |
Opening net book amount | $ 238,400 |
Increase due to business combinations | 2,267 |
Currency translation adjustment | (74) |
Additions | 41,442 |
Disposals | (6,315) |
Transfers |  |
Closing net book amount | 275,720 |
Depreciation |  |
Accumulated at the beginning of the year |  |
Translation differences | 8 |
Depreciation charge | 44,291 |
Transfers / Reclassifications |  |
Disposals / Consumptions | (1,705) |
Accumulated at the end of the year | 42,594 |
Right-of-use assets | 233,126 |
Land and civil buildings [member] |  |
Cost |  |
Opening net book amount | 27,713 |
Increase due to business combinations | 229 |
Currency translation adjustment | (88) |
Additions | 9,292 |
Disposals | (1,009) |
Transfers |  |
Closing net book amount | 36,137 |
Depreciation |  |
Accumulated at the beginning of the year |  |
Translation differences | (3) |
Depreciation charge | 8,514 |
Transfers / Reclassifications |  |
Disposals / Consumptions | (181) |
Accumulated at the end of the year | 8,330 |
Right-of-use assets | 27,807 |
Industrial buildings, plant and production equipment [member] |  |
Cost |  |
Opening net book amount | 202,352 |
Increase due to business combinations | 2,038 |
Currency translation adjustment | 6 |
Additions | 24,985 |
Disposals | (4,488) |
Transfers | 496 |
Closing net book amount | 225,389 |
Depreciation |  |
Accumulated at the beginning of the year |  |
Translation differences | 3 |
Depreciation charge | 31,869 |
Transfers / Reclassifications | (62) |
Disposals / Consumptions | (1,229) |
Accumulated at the end of the year | 30,581 |
Right-of-use assets | 194,808 |
Vehicles, furniture and fixtures [member] |  |
Cost |  |
Opening net book amount | 8,335 |
Increase due to business combinations |  |
Currency translation adjustment | 8 |
Additions | 7,165 |
Disposals | (818) |
Transfers | (496) |
Closing net book amount | 14,194 |
Depreciation |  |
Accumulated at the beginning of the year |  |
Translation differences | 8 |
Depreciation charge | 3,908 |
Transfers / Reclassifications | 62 |
Disposals / Consumptions | (295) |
Accumulated at the end of the year | 3,683 |
Right-of-use assets | $ 10,511 |

X
- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_a&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_DepreciationRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_RightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of accumulated depreciation for right-of-use assets. + References No definition available. + Details
Name: | ts_RightofuseAssetsAccumulatedDepreciation
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the effect of disposals/consumptions on accumulated depreciation for operating lease assets. + References No definition available. + Details
Name: | ts_RightofuseAssetsAccumulatedDepreciationDisposalsConsumptions
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the effect of transfers/reclassifications on accumulated depreciation for operating lease assets. + References No definition available. + Details
Name: | ts_RightofuseAssetsAccumulatedDepreciationTransfersReclassifications
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the effect of translation differences on accumulated depreciation for operating lease assets. + References No definition available. + Details
Name: | ts_RightofuseAssetsAccumulatedDepreciationTranslationDifferences
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the cost of right-of-use assets as of the specified date. + References No definition available. + Details
Name: | ts_RightofuseAssetsCost
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Represents the amount of additions to the cost of right-of-use assets during the period. + References No definition available. + Details
Name: | ts_RightofuseAssetsCostAdditions
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the change in the cost of right-of-use assets during the period due to currency translation adjustments. + References No definition available. + Details
Name: | ts_RightofuseAssetsCostCurrencyTranslationAdjustments
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the decrease in the cost of right-of-use assets during the period due to disposals. + References No definition available. + Details
Name: | ts_RightofuseAssetsCostDisposals
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the increase in the cost of right-of-use assets during the period due to business combinations. + References No definition available. + Details
Name: | ts_RightofuseAssetsCostIncreaseDueToBusinessCombinations
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the change during the period in the cost of right-of-use assets attributable to transfers. + References No definition available. + Details
Name: | ts_RightofuseAssetsCostTransfers
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ts_LandAndCivilBuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ts_IndustrialBuildingsPlantAndProductionEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfAssetsAxis=ts_VehiclesFurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |