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Note 21 - Non-current Allowances and Provisions (Tables) | 12 Months Ended
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Dec. 31, 2018
Statement Line Items [Line Items] |
Disclosure of detailed information about non-current allowances and provisions deducted from non-current receivables [text block] |
|  | Year ended December 31,
|  | 2018 |  | 2017
Values at the beginning of the year |  |  | (641 | ) |  |  | (913 | )
Translation differences |  |  | 110 |  |  |  | 106 |
Used |  |  | 531 |  |  |  | 166 |
Values at the end of the year |  |  | - |  |  |  | (641 | )
Disclosure of detailed information about non-current allowances and provisions from liabilities [text block] |
|  | Year ended December 31,
|  | 2018 |  | 2017
Values at the beginning of the year |  |  | 36,438 |  |  |  | 63,257 |
Translation differences |  |  | (5,261 | ) |  |  | 366 |
Additional provisions |  |  | 14,397 |  |  |  | 3,994 |
Reclassifications |  |  | (2,406 | ) |  |  | (7,591 | )
Used |  |  | (7,079 | ) |  |  | (23,588 | )
Values at the end of the year |  |  | 36,089 |  |  |  | 36,438 |

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

X
- 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_StatementLineItems
Namespace Prefix: | ts_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration