XML 91 R76.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Accounting Policies (Details Textual) R$ / shares in Units, $ / shares in Units, $ in Thousands, R$ in Millions |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 16, 2012 | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) $ / shares shares | Jan. 01, 2018 USD ($) | May 31, 2016 USD ($) shares | May 31, 2016 BRL (R$) R$ / shares shares | Apr. 30, 2016 USD ($) shares | Apr. 30, 2016 BRL (R$) R$ / shares shares | Dec. 31, 2014
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment loss on equity method investment in non-consolidated companies |  |  |  | $ 28,884 |  |  |  |  |  |
Number of major business segments |  | 1 |  |  |  |  |  |  |  |
Number of reportable operating segments |  | 1 |  |  |  |  |  |  |  |
Intangible assets and goodwill at end of period |  | $ 1,660,859 | 1,862,827 |  |  |  |  |  |  |
Research and development expense |  | $ 63,700 | $ 68,600 | $ 89,000 |  |  |  |  |  |
Number of shares authorised | shares |  | 2,500,000,000 | 2,500,000,000 | 2,500,000,000 |  |  |  |  |  |
Par value per share | $ / shares |  | $ 1 | $ 1 | $ 1 |  |  |  |  |  |
Total number of shares issued | shares |  | 1,180,536,830 | 1,180,536,830 | 1,180,536,830 |  |  |  |  |  |
Number of shares outstanding at end of period | shares |  | 1,180,536,830 | 1,180,536,830 | 1,180,536,830 |  |  |  |  |  |
Number of votes, per share |  | 1 | 1 | 1 |  |  |  |  |  |
Net defined benefit liability (asset) at end of period |  | $ 79,200 | $ 78,700 |  |  |  |  |  |  |
Employee benefits, unit vesting period |  | 4 years |  |  |  |  |  |  |  |
Employee benefits, company redemtpion period |  | 10 years |  |  |  |  |  |  |  |
Employee benefits, early redemption period |  | 7 years |  |  |  |  |  |  |  |
Carrying value of units granted |  | $ 94,800 | $ 92,900 |  |  |  |  |  |  |
Percentage of total sales, bill and hold arrangements |  | 3.30% | 2.80% | 3.00% |  |  |  |  |  |
Revenue from construction contracts |  | $ 11,000 |  |  |  |  |  |  |  |
Revenue from construction contracts, percentage of total sales |  | 0.21% |  |  |  |  |  |  |  |
Dilutive effect of share options on number of ordinary shares | shares |  | 0 |  |  |  |  |  |  |  |
ITALY |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Net defined contribution plan liability (asset) at end of period |  | $ 19,300 |  |  |  |  |  |  |  |
Unfunded defined benefit employee retirement plan for certain senior officers [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Net defined benefit liability (asset) at end of period |  | 46,800 |  |  |  |  |  |  |  |
Funded post-employment benefits [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Net defined benefit liability (asset) at end of period |  | 165,486 | $ 159,612 | $ 153,974 |  |  |  |  |  |
Funded post-employment benefits [member] | CANADA |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Net defined benefit liability (asset) at end of period |  | 16,700 |  |  |  |  |  |  |  |
Funded post-employment benefits [member] | UNITED STATES |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Net defined benefit liability (asset) at end of period |  | 12,300 |  |  |  |  |  |  |  |
Information system projects [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets and goodwill at end of period |  | 81,746 | 145,957 |  |  |  |  |  |  |
Trademarks [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets and goodwill at end of period |  | 86,700 | 86,700 |  |  |  |  |  |  |
Customer-related intangible assets [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible assets and goodwill at end of period |  | $ 193,415 | $ 324,878 |  |  |  |  |  |  |
Customer-related intangible assets [member] | Maverick acquisition [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  | 14 years |  |  |  |  |  |  |  |
Remaining amortisation period of intangible assets material to entity |  | 2 |  |  |  |  |  |  |  | 5
Finite-lived intangible asset, residual value |  | $ 193,000 |  |  |  |  |  |  |  |
Finite-lived intangible asset, residual useful life |  | 3 years |  |  |  |  |  |  |  |
Customer-related intangible assets [member] | Hydrill acquisition [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  | 10 years |  |  |  |  |  |  |  |
Top of range [member] | Information system projects [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  | 3 years |  |  |  |  |  |  |
Top of range [member] | Licenses, patents, trademarks, and proprietary technology [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  | 10 years |  |  |  |  |  |  |  |
Ternium s.a. [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  | 11.46% |  |  |  |  |  |  |  |
Impairment loss on equity method investment in non-consolidated companies |  | $ 0 | $ 0 | $ 0 |  |  |  |  |  |
Usiminas [member] | Preference shares [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Interest in associate, shares owned | shares |  | 1,300,000 |  |  |  |  |  |  |  |
Usiminas [member] | Ordinary shares [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Interest in associate, shares owned | shares |  | 36,500,000 |  |  |  |  |  |  |  |
Usiminas [member] | CONFAB INDUSTRIAL S.A. and subsidiaries [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  | 3.08% | 3.08% |  |  |  |  |  |  |
Proportion of voting rights held in associate |  | 5.20% | 5.20% |  |  |  |  |  |  |
Usiminas [member] | CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Preference shares [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares subscribed to | shares |  |  |  |  |  |  |  | 1,300,000 | 1,300,000 |
Shares subscribed to, price per share | R$ / shares |  |  |  |  |  |  |  |  | R$ 1.28 |
Shares subscribed to, value |  |  |  |  |  |  |  | $ 500 | R$ 1.6 |
Usiminas [member] | CONFAB INDUSTRIAL S.A. and subsidiaries [member] | Ordinary shares [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares subscribed to | shares |  |  |  |  |  | 11,500,000 | 11,500,000 |  |  |
Shares subscribed to, price per share | R$ / shares |  |  |  |  |  |  | R$ 5 |  |  |
Shares subscribed to, value |  |  |  |  |  | $ 16,600 | R$ 57.5 |  |  |
Usiminas [member] | Ternium s.a. [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate | 13.80% |  |  |  |  |  |  |  |  |
Proportion of voting rights held in associate | 27.70% |  |  |  |  |  |  |  |  |
Increase (decrease) due to changes in accounting policy [member] | Retrospective changes applied after the reporting period [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in financial assets arising from change in measurement attribute, initial application of IFRS 9 |  |  |  |  | $ 3,000 |  |  |  |  |
Expected decrease in allowance for doubtful accounts |  |  |  |  | 6,000 |  |  |  |  |
Increase (decrease) due to application of IFRS 15 [member] | Retrospective changes applied after the reporting period [member] |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |
Expected net increase (decrease) in revenues, cost of sales and selling expenses from adoption of a policy |  |  |  |  | $ (700) |  |  |  |  |

X
- Definition The number of dilutive potential ordinary shares that relate to the assumed exercise of the entity's share options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 33 -IssueDate 2017-01-01 -Paragraph 70 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=33&date=2017-03-01&anchor=para_70_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DilutiveEffectOfShareOptionsOnNumberOfOrdinaryShares
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in financial assets arising from a change in measurement attribute on the entity's transition to IFRS 9. [Refer: Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 42L -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_42L_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_IncreaseDecreaseInFinancialAssetsArisingFromChangeInMeasurementAttributeFirstApplicationOfIFRS9
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of intangible assets and goodwill held by the entity. [Refer: Goodwill; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_55&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_IntangibleAssetsAndGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2017-01-01 -Paragraph 140 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2017-03-01&anchor=para_140_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_LiabilityAssetOfDefinedBenefitPlans
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of shares authorised. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_i&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NumberOfSharesAuthorised
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares issued by the entity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NumberOfSharesIssued
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_NumberOfSharesOutstanding
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The nominal value per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 79 -Subparagraph a -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_iii&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ParValuePerShare
Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition The proportion of ownership interest in an associate attributable to the entity. [Refer: Associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInAssociate
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The proportion of the voting rights in an associate held by the entity. [Refer: Associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_17_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2017-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=27&date=2017-03-01&anchor=para_16_b_iii&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ProportionOfVotingPowerHeldInAssociate
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The remaining amortisation period of individual intangible assets that are material to the entity’s financial statements. [Refer: Depreciation and amortisation expense] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 122 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_122_b&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_RemainingAmortisationPeriodOfIntangibleAssetsMaterialToEntity
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of expenditure directly attributable to research or development activities, recognised in profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2017-01-01 -Paragraph 126 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_126&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ResearchAndDevelopmentExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of revenue arising from construction contracts. Construction contracts are contracts specifically negotiated for the construction of an asset or a combination of assets that are closely interrelated or interdependent in terms of their design, technology and function or their ultimate purpose or use. [Refer: Revenue] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IAS -Number 11 -IssueDate 2017-01-01 -Paragraph 39 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=11&date=2017-03-02&anchor=para_39_a&doctype=Standard&book=B -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IAS -Number 18 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=18&date=2017-03-02&anchor=para_35_b&doctype=Standard&book=B -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRIC -Number 15 -IssueDate 2017-01-01 -Paragraph 20 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRIC&num=15&date=2017-03-02&anchor=para_20_b&doctype=Standard&book=B -URIDate 2017-03-09 + Details
Name: | ifrs-full_RevenueFromConstructionContracts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the carrying value of units granted to date under the employee retention and long term incentive program. + References No definition available. + Details
Name: | ts_CarryingValueOfUnitsGranted
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the period at which the company will redeem units granted under the employee retention and long term inventive program. + References No definition available. + Details
Name: | ts_EmployeeBenefitsCompanyRedemtpionPeriod
Namespace Prefix: | ts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period that the company may exercise an option to for early redemption of units granted under the employee retention and long term incentive program. + References No definition available. + Details
Name: | ts_EmployeeBenefitsEarlyRedemptionPeriod
Namespace Prefix: | ts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period that units under an employee retention and long term incentive program vest ratably. + References No definition available. + Details
Name: | ts_EmployeeBenefitsUnitVestingPeriod
Namespace Prefix: | ts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount expected to decrease in allowance for doubtful accounts related the adoption of IFRS 9. + References No definition available. + Details
Name: | ts_ExpectedDecreaseInAllowanceForDoubtfulAccounts
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The expected net increase (decrease) in revenues, cost of sales and selling expenses from adoption of a policy. + References No definition available. + Details
Name: | ts_ExpectedNetIncreaseDecreaseInRevenuesCostOfSalesAndSellingExpensesFromAdoptionOfAPolicy
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the residual useful life of a finite-lived intangible asset. + References No definition available. + Details
Name: | ts_FinitelivedIntangibleAssetResidualUsefulLife
Namespace Prefix: | ts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the aggregate expected value at the end of their useful life of a finite-lived intangible asset. + References No definition available. + Details
Name: | ts_FinitelivedIntangibleAssetResidualValue
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the useful life of finite-lived intangible assets. + References No definition available. + Details
Name: | ts_FinitelivedIntangibleAssetUsefulLife
Namespace Prefix: | ts_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of impairment loss on equity method investment in non-consolidated companies. + References No definition available. + Details
Name: | ts_ImpairmentLossOnEquityMethodInvestmentInNonconsolidatedCompanies
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of shares owned of an associate entity. + References No definition available. + Details
Name: | ts_InterestInAssociateSharesOwned
Namespace Prefix: | ts_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of deficit or surplus in a defined contribution plan, adjusted for any effect of limiting a net defined contribution asset to the asset ceiling. + References No definition available. + Details
Name: | ts_NetDefinedContributionPlanLiabilityAssetAtEndOfPeriod
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the number of major business segments. + References No definition available. + Details
Name: | ts_NumberOfMajorBusinessSegments
Namespace Prefix: | ts_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of reportable operating segments. + References No definition available. + Details
Name: | ts_NumberOfReportableOperatingSegments
Namespace Prefix: | ts_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of shares subscribed to. + References No definition available. + Details
Name: | ts_NumberOfSharesSubscribedTo
Namespace Prefix: | ts_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of votes given to each share of stock. + References No definition available. + Details
Name: | ts_NumberOfVotesPerShare
Namespace Prefix: | ts_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of total sales that is generated by bill and hold arrangements. A bill and hold arrangement is a form of sale where a seller of a good bills a customer for products but does not ship the product until a later date. + References No definition available. + Details
Name: | ts_PercentageOfTotalSalesBillAndHoldArrangements
Namespace Prefix: | ts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of total sales that is made up from construction contracts. + References No definition available. + Details
Name: | ts_RevenueFromConstructionContractsPercentageOfTotalSales
Namespace Prefix: | ts_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the price per share of shares subscribed to. + References No definition available. + Details
Name: | ts_SharesSubscribedToPricePerShare
Namespace Prefix: | ts_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the value of shares subscribed to. + References No definition available. + Details
Name: | ts_SharesSubscribedToValue
Namespace Prefix: | ts_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_IT
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_CA
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_GeographicalAreasAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=ts_InformationSystemProjectsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=ts_TrademarksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=ifrs-full_CustomerrelatedIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=ts_MaverickAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BusinessCombinationsAxis=ts_HydrillAcquisitionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsAndGoodwillAxis=ts_LicensesPatentsTrademarksAndProprietaryTechnologyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=ts_TerniumSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInAssociatesAxis=ts_UsiminasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_PreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_OrdinarySharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=ts_ConfabIndustrialSaAndSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=ts_TerniumSAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis=ifrs-full_FinancialEffectOfChangesInAccountingPolicyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ts_RetrospectiveChangesAppliedAfterTheReportingPeriodMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis=ifrs-full_IncreaseDecreaseDueToApplicationOfIFRS15Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |