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Financial Risk Management - Financial Assets and Liabilities Which Impact Profit and Loss (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Statement Line Items [Line Items] |  |
Currency exposure / functional currency | $ 3,600,000 | $ 5,300,000
Argentine Peso / U.S. dollar foreign exchange risk [member] |  |
Statement Line Items [Line Items] |  |
Currency exposure / functional currency | (186,867,000) | (64,482,000)
Euro / U.S. dollar foreign exchange risk [member] |  |
Statement Line Items [Line Items] |  |
Currency exposure / functional currency | $ (175,419,000) | $ (365,926,000)

X
- Definition The amount of currency exposure which impact profit and loss expressed as long/(short). + References No definition available. + Details
Name: | ts_ForeignExchangeRiskCurrencyExposure
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ts_ArgentinePesoUsDollarForeignExchangeRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ts_EuroUsDollarForeignExchangeRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |