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Note 19 - Borrowings - Significant Borrowings as of Closing Date (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Statement Line Items [Line Items] |  |
Significant borrowings as of closing date | $ 822,152 | $ 539,007
Significant borrowings as of closing date [member] | Tamsa (Hydril and other) [member] |  |
Statement Line Items [Line Items] |  |
Significant borrowings as of closing date | 621,000 |
Significant borrowings as of closing date [member] | SIDERCA S.A.I.C. and subsidiaries [member] |  |
Statement Line Items [Line Items] |  |
Significant borrowings as of closing date | $ 60,000 |

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + 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: | ts_StatementLineItems
Namespace Prefix: | ts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=ts_SidercaSaicAndSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |