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Note 24 - Current allowances and provisions - Deducted From Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Allowance for doubtful accounts - trade receivables [member] |  |
Disclosure of other provisions [line items] |  |
Values at the beginning of the year | $ (48,782) | $ (66,535)
Translation differences | (37) | 9
Increase due to business combinations | (1,930) | (1,788)
(Additional) / reversals allowances |  | 16,256
Used | 1,717 | 3,276
(Additional) allowances | (4,644) |
Values at the end of the year | (53,676) | (48,782)
Allowance for other doubtful accounts - other receivables [member] |  |
Disclosure of other provisions [line items] |  |
Values at the beginning of the year | (4,892) | (6,784)
Translation differences | 801 | 88
Increase due to business combinations |  |
(Additional) / reversals allowances |  | 1,239
Used | 1,437 | 565
(Additional) allowances | (1,263) |
Values at the end of the year | (3,917) | (4,892)
Allowance for inventory obsolescence [member] |  |
Disclosure of other provisions [line items] |  |
Values at the beginning of the year | (217,717) | (209,796)
Translation differences | 1,560 | 794
Increase due to business combinations | (76,776) | (10,761)
(Additional) / reversals allowances |  | (29,138)
Used | 65,107 | 31,184
(Additional) allowances | (35,809) |
Values at the end of the year | $ (263,635) | $ (217,717)

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- Definition The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -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 Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 37 -IssueDate 2019-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=37&code=ifrs-tx-2019-en-r&anchor=para_84&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The decrease in an allowance account for credit losses of financial assets resulting from the utilisation of the allowance. [Refer: Allowance account for credit losses of financial assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of increase (decrease) due to additional allowances, of other provisions. + References No definition available. + Details
Name: | ts_IncreaseDecreaseAdditionalAllowancesOtherProvisions
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The increase (decrease) through reversals and (additional) allowances. + References No definition available. + Details
Name: | ts_IncreaseDecreaseThroughReversalsAndAdditionalAllowances
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfProvisionsAxis=ts_AllowanceForInventoryObsolescenceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |