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Financial Risk Management - Financial Assets and Liabilities Which Impact Profit and Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Argentine Peso / U.S. dollar foreign exchange risk [member]
Statement Line Items [Line Items]
Currency exposure / functional currency	$ (95,811)	$ (186,867)
Euro / U.S. dollar foreign exchange risk [member]
Statement Line Items [Line Items]
Currency exposure / functional currency	(103,518)	(175,419)
Saudi Arabian Riyal / US Dollar exchange risk [member]
Statement Line Items [Line Items]
Currency exposure / functional currency	$ (107,582)

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:

X

- Details

Name:	ifrs-full_TypesOfRisksAxis=ts_SaudiArabianRiyalUsDollarExchangeRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: