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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

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- 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