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Note 22 - Non-current Allowances and Provisions (Tables) | 12 Months Ended
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Dec. 31, 2017
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, |
|  | 2017 |  |  | 2016 |
Values at the beginning of the year |  |  | (913 | ) |  |  | (1,112 | )
Translation differences |  |  | 106 |  |  |  | 199 |
Used |  |  | 166 |  |  |  | - |
Values at the end of the year |  |  | (641 | ) |  |  | (913 | )
Disclosure of detailed information about non-current allowances and provisions from liabilities [text block] |
|  | Year ended December 31, |
|  | 2017 |  |  | 2016 |
Values at the beginning of the year |  |  | 63,257 |  |  |  | 61,421 |
Translation differences |  |  | 366 |  |  |  | 3,296 |
Additional provisions |  |  | 3,994 |  |  |  | 6,794 |
Reclassifications |  |  | (7,591 | ) |  |  | (1,932 | )
Used |  |  | (23,588 | ) |  |  | (6,322 | )
Values at the end of the year |  |  | 36,438 |  |  |  | 63,257 |

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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

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