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Note 21 - Borrowings - Borrowings Evolution (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024
Note 21 - Borrowings |  |
At the beginning of the year, noncurrent | $ 11,399 |
At the beginning of the year, current | 425,999 |
At the end of the year, noncurrent | 368 | $ 11,399
At the end of the year, current | 305,354 | 425,999
At the beginning of the year | 437,398 | 583,437
Translation differences | (632) | (6,805)
Proceeds and repayments, net | (117,114) | (128,761)
Interests accrued less payments | 325 | (3,707)
Overdrafts variation | (14,255) | (6,766)
At the end of the year | $ 305,722 | $ 437,398

X
- Definition The amount of outstanding funds that the entity is obligated to repay. + 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_Borrowings
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_BorrowingsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of current borrowings and current portion of non-current borrowings. [Refer: Borrowings] + 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_CurrentBorrowingsAndCurrentPortionOfNoncurrentBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The non-current portion of non-current borrowings. [Refer: Borrowings] + 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_LongtermBorrowings
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in borrowings resulting from interests accrued net of payments. + References No definition available. + Details
Name: | ts_EffectOfInterestsAccruedNetOfPaymentsOnBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in borrowings resulting from net proceeds and repayments. + References No definition available. + Details
Name: | ts_EffectOfNetProceedsAndRepaymentsOnBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in borrowings resulting from overdrafts variation. + References No definition available. + Details
Name: | ts_EffectOfOverdraftsVariationOnBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase (decrease) in borrowings resulting from translation differences. + References No definition available. + Details
Name: | ts_EffectOfTranslationDifferencesOnBorrowings
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration