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Note 22 - Other Liabilities - Other Current Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure of Other Liabilities [Abstract] |  |
Payroll and social security payable | $ 175,175 | $ 153,009
Miscellaneous | 27,651 | 23,255
Other current liabilities | $ 202,826 | $ 176,264

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- Definition The amount of current liabilities that the entity does not separately disclose in the same statement or note. [Refer: Current liabilities] + 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
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of current employee related liabilities. + References No definition available. + Details
Name: | ts_CurrentEmployeeRelatedLiabilities
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The amount of other current miscellaneous liabilities. + References No definition available. + Details
Name: | ts_OtherCurrentMiscellaneousLiabilities
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant