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Note 21 - Other Liabilities - Actuarial Assumptions (Details) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Funded post-employment benefits [member] |  |
Statement Line Items [Line Items] |  |
Discount rate | 4.00% | 4.00%
Bottom of range [member] | Unfunded post-employment benefits [member] |  |
Statement Line Items [Line Items] |  |
Discount rate | 1.00% | 1.00%
Rate of compensation increase | 0.00% | 0.00%
Bottom of range [member] | Funded post-employment benefits [member] |  |
Statement Line Items [Line Items] |  |
Rate of compensation increase | 0.00% | 0.00%
Top of range [member] | Unfunded post-employment benefits [member] |  |
Statement Line Items [Line Items] |  |
Discount rate | 7.00% | 7.00%
Rate of compensation increase | 3.00% | 3.00%
Top of range [member] | Funded post-employment benefits [member] |  |
Statement Line Items [Line Items] |  |
Rate of compensation increase | 3.00% | 3.00%

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- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ActuarialAssumptionOfDiscountRates
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [member]; Defined benefit obligation, at present value; Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 144 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_144&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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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
Name: | ifrs-full_DefinedBenefitPlansAxis=ts_FundedPostemploymentBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=ts_UnfundedPostemploymentBenefitsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |