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Financial Risk Management - Financial Assets and Liabilities Which Impact Profit and Loss (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Statement Line Items [Line Items]
Currency exposure / functional currency	$ 5,300	$ 6,600
Argentine Peso / U.S. dollar foreign exchange risk [member]
Statement Line Items [Line Items]
Currency exposure / functional currency	(64,482)	(60,204)
Euro / U.S. dollar foreign exchange risk [member]
Statement Line Items [Line Items]
Currency exposure / functional currency	(365,926)	(406,814)
U.S. dollar / Brazilian Real foreign exchange risk [member]
Statement Line Items [Line Items]
Currency exposure / functional currency	$ (183)	$ 125,880

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- 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

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- 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_UsDollarBrazilianRealForeignExchangeRiskMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: