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Accounting Policies - Changes in Key Assumptions That Would Cause the Recoverable Amount to Equal the Carrying Value (Details)	Dec. 31, 2019
Discount rate, measurement input [member]
Statement Line Items [Line Items]
Increase (decrease) in key assumption	0.95%
Growth rate, measurement input [member]
Statement Line Items [Line Items]
Increase (decrease) in key assumption	(1.60%)
Projected change rate in future cash flows, measurement input [member]
Statement Line Items [Line Items]
Increase (decrease) in key assumption	(15.30%)

X

- Definition

The amount by which value that has been assigned to a key assumption must change in order for a unit's recoverable amount to be equal to its carrying amount, expressed as a percentage.

+ References

No definition available.

+ Details

Name:	ts_AmountByWhichValueAssignedToKeyAssumptionMustChangeInOrderForUnitsRecoverableAmountToBeEqualToCarryingAmountPercentage
Namespace Prefix:	ts_
Data Type:	num:percentItemType
Balance Type:	na
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_UnobservableInputsAxis=ifrs-full_DiscountRateMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_UnobservableInputsAxis=ts_GrowthRateMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_UnobservableInputsAxis=ts_ProjectedChangeRateInFutureCashFlowsMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: