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Note 21 - Other Liabilities - Other Noncurrent Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Statement Line Items [Line Items] |  |
Post-employment benefits | $ 144,993 | $ 115,087
Other-long term benefits | 85,473 | 78,492
Miscellaneous | 20,917 | 19,550
Other non-current liabilities | $ 251,383 | $ 213,129

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- Definition The amount of non-current liabilities that the entity does not separately disclose in the same statement or note. [Refer: Non-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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Balance Type: | credit
Period Type: | instant

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- Definition The amount of non-current post-employment benefits. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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- References No definition available. + Details
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Data Type: | xbrli:stringItemType
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Period Type: | duration