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Note 23 - Current Allowances and Provisions - Deducted From Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Allowance for doubtful accounts - trade receivables [member] |  |
Statement Line Items [Line Items] |  |
Values at the beginning of the year | $ (66,535) | $ (78,385)
Translation differences | 9 | 329
Increase due to business combinations | (1,788) |
Additional / reversals allowances | 16,256 |
Used | 3,276 | 6,849
Effect of adoption of new standards |  | 6,423
Additional allowances |  | (1,751)
Values at the end of the year | (48,782) | (66,535)
Allowance for other doubtful accounts - other receivables [member] |  |
Statement Line Items [Line Items] |  |
Values at the beginning of the year | (6,784) | (6,255)
Translation differences | 88 | 359
Increase due to business combinations |  |
Additional / reversals allowances | 1,239 |
Used | 565 | 291
Effect of adoption of new standards |  |
Additional allowances |  | (1,179)
Values at the end of the year | (4,892) | (6,784)
Allowance for inventory obsolescence [member] |  |
Statement Line Items [Line Items] |  |
Values at the beginning of the year | (209,796) | (216,068)
Translation differences | 794 | 3,575
Increase due to business combinations | (10,761) |
Additional / reversals allowances | (29,138) |
Used | 31,184 | 28,154
Effect of adoption of new standards |  |
Additional allowances |  | (25,457)
Values at the end of the year | $ (217,717) | $ (209,796)

X
- 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

X
- 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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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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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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

X
- Definition The amount of increase (decrease) due to the effect of adoption of new accounting standards, of other provisions. + References No definition available. + Details
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Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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

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- Details
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Namespace Prefix: |
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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: |