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Note 22 - Current Allowances and Provisions - Deducted From Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts - trade receivables [member] |  |
Statement Line Items [Line Items] |  |
Values at the beginning of the year | $ (78,385) | $ (85,724)
Effect of adoption of new standards | 6,423 |
Translation differences | 329 | (345)
Additional allowances | (1,751) |
Used | 6,849 | 2,263
Reversals / (additional) allowances |  | 5,421
Values at the end of the year | (66,535) | (78,385)
Allowance for other doubtful accounts - other receivables [member] |  |
Statement Line Items [Line Items] |  |
Values at the beginning of the year | (6,255) | (6,332)
Effect of adoption of new standards |  |
Translation differences | 359 | (220)
Additional allowances | (1,179) |
Used | 291 | 381
Reversals / (additional) allowances |  | (84)
Values at the end of the year | (6,784) | (6,255)
Allowance for inventory obsolescence [member] |  |
Statement Line Items [Line Items] |  |
Values at the beginning of the year | (216,068) | (240,242)
Effect of adoption of new standards |  |
Translation differences | 3,575 | (3,575)
Additional allowances | (25,457) |
Used | 28,154 | 14,832
Reversals / (additional) allowances |  | 12,917
Values at the end of the year | $ (209,796) | $ (216,068)

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- 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 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 84 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84&doctype=Standard -URIDate 2017-03-09 + 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 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_16&doctype=Standard&book=B -URIDate 2017-03-09 + 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 amount of increase (decrease) due to the effect of adoption of new accounting standards, of other provisions. + References No definition available. + Details
Name: | ts_IncreaseDecreaseDueToEffectOfAdoptionOfNewAccountingStandardsOtherProvisions
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
Name: | ts_IncreaseDecreaseThroughReversalsAndAdditionalAllowances
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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

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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_AllowanceForOtherDoubtfulAccountsOtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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