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Note 13 - Right-of-use assets, net and lease liabilities - Evolution of Lease Liability (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Note 13 - Right-of-use assets, net and lease liabilities |  |  |  |
Opening net book amount | $ 144,926 |  | $ 134,433 |
Changes due to business combinations |  |  | (35) | [1]
Translation differences | 5,713 |  | (4,565) |
Additions | 64,132 |  | 91,005 |
Cancellations | (6,315) |  | (8,377) |
Repayments | (71,712) | [2] | (73,639) |
Interest accrued | 6,505 |  | 6,104 |
Ending net book amount | $ 143,249 |  | $ 144,926 |
[1] | For the year 2024, related to Mattr’s pipe coating business unit acquisitions.
[2] | For the year 202 5, i nclude s repayments of $66.9 million in capital and $4.8 million of interest.

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- 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 2025-01-01 -Paragraph 47 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2025-en-r&anchor=para_47_b&doctype=Standard -URIDate 2025-03-27 + 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

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- 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

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- 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

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- 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

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- 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

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- 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

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- 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