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Note 23 - Other liabilities - Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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Note 23 - Other liabilities |  |
Post-employment benefits | $ 141,440 | $ 131,564
Other long-term benefits | 103,705 | 101,260
Other liabilities with related parties | 4,383 | 2,084
Miscellaneous | 61,179 | 66,843
Other non-current liabilities | $ 310,707 | $ 301,751

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- Definition The amount of non-current liabilities that the entity does not separately disclose in the same statement or note. [Refer: Non-current liabilities] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_OtherNoncurrentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | ts_DisclosureOfOtherLiabilitiesAbstract
Namespace Prefix: | ts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of non-current post-employment benefits liability. + References No definition available. + Details
Name: | ts_NoncurrentPostemploymentBenefitsLiability
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of other non-current benefits liability. + References No definition available. + Details
Name: | ts_OtherNoncurrentBenefitsLiability
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of other non-current miscellaneous liabilities. + References No definition available. + Details
Name: | ts_OtherNoncurrentMiscellaneousLiabilities
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of other non-current related parties liability. + References No definition available. + Details
Name: | ts_OtherNoncurrentRelatedPartiesLiability
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant