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Note 23 - Non-current allowances and provisions (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of Non-current allowances and provisions [Abstract] |
Disclosure of detailed information about non-current allowances and provisions from liabilities [text block] | Liabilities
|  |  | Year ended December 31, |
|  | 2020 |  |  | 2019 |
(all amounts in thousands of U.S. dollars) |  |  |  |  |  |  |  |
Values at the beginning of the year |  |  | 54,599 |  |  |  | 36,089 |
Translation differences |  |  | (5,739 | ) |  |  | (1,571 | )
Increase due to business combinations |  |  | 26,542 |  |  |  | - |
Additional provisions |  |  | 478 |  |  |  | 19,904 |
Reclassifications |  |  | 557 |  |  |  | 5,641 |
Used |  |  | (3,219 | ) |  |  | (5,464 | )
Values at the end of the year |  |  | 73,218 |  |  |  | 54,599 |

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- Definition The disclosure of detailed information about non-current allowances and provisions from liabilities. + References No definition available. + Details
Name: | ts_DisclosureOfDetailedInformationAboutNoncurrentAllowancesAndProvisionsFromLiabilitiesTextBlock
Namespace Prefix: | ts_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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