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v3.26.1

Note 25 - Current allowances and provisions - Deducted From Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Allowance for doubtful accounts - trade receivables [member] |  |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Receivables and other assets current allowances, At beginning of the year |  | $ (48,125) | $ (49,046)
Receivables and other assets current allowances, Translation differences |  | (93) | 194
Receivables and other assets current allowances, Decrease due to deconsolidation of subsidiaries |  | 1 |
Receivables and other assets current allowances, Changes due to business combinations | [1] |  | (1,151)
Receivables and other assets current allowances, (Additional) / reversal allowances |  | (14,180) | 1,095
Receivables and other assets current allowances, Used and other movements |  | 2,810 | 783
Receivables and other assets current allowances, At end of the year |  | (59,587) | (48,125)
Allowance for other doubtful accounts - other receivables [member] |  |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Receivables and other assets current allowances, At beginning of the year |  | (3,094) | (3,439)
Receivables and other assets current allowances, Translation differences |  | (80) | 324
Receivables and other assets current allowances, Decrease due to deconsolidation of subsidiaries |  |  |
Receivables and other assets current allowances, Changes due to business combinations |  |  |
Receivables and other assets current allowances, (Additional) / reversal allowances |  | (631) | (546)
Receivables and other assets current allowances, Used and other movements |  | 1 | 567
Receivables and other assets current allowances, At end of the year |  | (3,804) | (3,094)
Allowance for inventory obsolescence [member] |  |  |
Reconciliation of changes in allowance account for credit losses of financial assets [abstract] |  |  |
Receivables and other assets current allowances, At beginning of the year |  | (203,174) | (209,110)
Receivables and other assets current allowances, Translation differences |  | (1,775) | 897
Receivables and other assets current allowances, Decrease due to deconsolidation of subsidiaries |  | 34 |
Receivables and other assets current allowances, Changes due to business combinations | [1] |  | (3,676)
Receivables and other assets current allowances, (Additional) / reversal allowances |  | (53,700) | (41,240)
Receivables and other assets current allowances, Used and other movements |  | 28,613 | 49,955
Receivables and other assets current allowances, At end of the year |  | $ (230,002) | $ (203,174)
[1] | For the year 2024, related to Mattr’s pipe coating business unit acquisition.

X
- References No definition available. + Details
Name: | ifrs-full_ReconciliationOfChangesInAllowanceAccountForCreditLossesOfFinancialAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of allowance for acquisitions through business combinations receivables and other assets current. + References No definition available. + Details
Name: | ts_AcquisitionsThroughBusinessCombinationsReceivablesAndOtherAssetsCurrentAllowance
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of allowance for decrease through deconsolidation of subsidiaries receivables and other assets current. + References No definition available. + Details
Name: | ts_DecreaseDueToDeconsolidationOfSubsidiariesReceivablesAndOtherAssetsCurrentAllowance
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of allowance for decrease through allowances used and other movements receivables and other assets current. + References No definition available. + Details
Name: | ts_DecreaseThroughAllowancesUsedAndOtherMovementsReceivablesAndOtherAssetsCurrentAllowance
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of allowance for increase decrease through net exchange differences receivables and other assets current. + References No definition available. + Details
Name: | ts_IncreaseDecreaseThroughNetExchangeDifferencesReceivablesAndOtherAssetsCurrentAllowance
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of allowance for increase decrease through reversals and additional allowances receivables and other assets current. + References No definition available. + Details
Name: | ts_IncreaseDecreaseThroughReversalsAndAdditionalAllowancesReceivablesAndOtherAssetsCurrentAllowance
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of allowance for receivables and other assets current. + References No definition available. + Details
Name: | ts_ReceivablesAndOtherAssetsCurrentAllowance
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=ts_AllowanceForDoubtfulAccountsTradeReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=ts_AllowanceForOtherDoubtfulAccountsOtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=ts_AllowanceForInventoryObsolescenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |