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Note 14 - Investments in non-consolidated companies - Summary of Investments in Non-consolidated Companies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Reconciliation of changes in investments in subsidiaries joint ventures and associates [abstract] |  |  |
At the beginning of the year | $ 1,608,804 | $ 1,540,646 |
Translation differences | (47,840) | 110,801 | $ 7,336
Equity in earnings of non-consolidated companies | 8,548 | 79,411 |
Dividends and distributions declared | (71,212) | (69,216) |
Acquisition of non-consolidated companies | 0 | 22,661 |
Decrease due to step-acquisition | 0 | (23,453) |
Increase / (decrease) in equity reserves and others | 45,357 | (52,046) |
At the end of the year | $ 1,543,657 | $ 1,608,804 | $ 1,540,646

X
- Definition The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Total for all associates [member]; Total for all joint ventures [member]; Total for all subsidiaries [member]; Investments in subsidiaries reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 10 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_10&doctype=Standard -URIDate 2024-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the amount of divdends declared by nonconsolidated companies. + References No definition available. + Details
Name: | ts_DividendsDeclaredByNonconsolidatedCompanies
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of income (loss) from equity method investments in non-consolidated companies. + References No definition available. + Details
Name: | ts_IncomeLossFromEquityMethodInvestmentsInNonconsolidatedCompanies
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of decrease in investments in subsidiaries, joint ventures and associates during the period due to step-acquisition. + References No definition available. + Details
Name: | ts_InvestmentsInSubsidiariesJointVenturesAndAssociatesDecreaseDueToStepAcquisition
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the increase in investments in subsidiaries, joint ventures and associates during the period due to increase in participation. + References No definition available. + Details
Name: | ts_InvestmentsInSubsidiariesJointVenturesAndAssociatesIncreaseDueToIncreaseInParticipation
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of other comprehensive income (loss), net of tax, attributable to non-consolidated companies related to exchange differences when financial statements of foreign operations are translated. + References No definition available. + Details
Name: | ts_OtherComprehensiveIncomeLossNetOfTaxExchangeDifferencesOnTranslationAttributableToNonconsolidatedCompanies
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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X
- Definition The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, including dividends declared, net of tax. + References No definition available. + Details
Name: | ts_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodIncludingDividendsDeclaredNetOfTax
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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