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Note 12 - Right-of-use Assets, Net and Lease Liabilities - Evolution of Lease Liability (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Presentation of leases for lessee [abstract]
Opening net book amount		$ 230,167	$ 234,149
Increase due to business combinations		26,046	2,267
Translation differences		7,656	2,690
Additions		58,536	36,957
Cancellations		(17,529)	(4,688)
Repayments	[1]	(51,666)	(43,974)
Interest accrued		4,133	2,766
Ending net book amount		$ 257,343	$ 230,167
[1] Repayments include capital and interest.

X

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_LeaseLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_PresentationOfLeasesForLesseeAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of additions to lease liabilities during the period.

+ References

No definition available.

+ Details

Name:	ts_LeaseLiabilitiesAdditions
Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the change in lease liabilities during the period attributable to cancellations.

+ References

No definition available.

+ Details

Name:	ts_LeaseLiabilitiesCancellations
Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the increase in lease liabilities during the period due to business combinations.

+ References

No definition available.

+ Details

Name:	ts_LeaseLiabilitiesIncreaseDueToBusinessCombinations
Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the change in lease liabilities during the period attributable to interest accrued.

+ References

No definition available.

+ Details

Name:	ts_LeaseLiabilitiesInterestAccrued
Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Represents the change in lease liabilities during the period from repayments.

+ References

No definition available.

+ Details

Name:	ts_LeaseLiabilitiesRepayments
Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the impact of translation differences on lease liabilities during the period.

+ References

No definition available.

+ Details

Name:	ts_LeaseLiabilitiesTranslationDifferences
Namespace Prefix:	ts_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration