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v3.23.1

II. Accounting Policies (Details Textual) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2022 USD ($) $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2017
Disclosure of associates [line items] |  |  |  |
Goodwill or intangible assets recognized in relation to investments in non consolidated companies under the equity method | $ 0 |  |  |
Number of major business segments | 1 |  |  |
Additional amortization expenses |  |  | $ 11,100 |
Total intangible assets and goodwill | $ 1,332,508 | $ 1,372,176 |  |
Research and development expense | 50,700 | 45,300 | 41,800 |
Selling, general and administrative expenses, amortization of intangible assets | $ 59,018 | $ 63,874 | $ 82,355 |
Discount rate used in current estimate of value in use | 13.50% |  |  |
Number of shares authorised (in shares) | shares | 2,500,000,000 | 2,500,000,000 | 2,500,000,000 |
Par value per share (in dollars per share) | $ / shares | $ 1 | $ 1 | $ 1 |
Total number of shares issued (in shares) | shares | 1,180,536,830 | 1,180,536,830 | 1,180,536,830 |
Number of shares outstanding at end of period (in shares) | shares | 1,180,536,830 | 1,180,536,830 | 1,180,536,830 |
Number of votes, per share | 1 | 1 | 1 |
Employee benefits, unit vesting period (Year) |  |  |  | 4 years
Employee benefits, company redemption period (Year) | 7 years |  |  | 10 years
Employee benefits, early redemption period (Year) |  |  |  | 7 years
Carrying value of units granted | $ 123,900 | $ 99,600 |  |
Dilutive effect of share options on number of ordinary shares (in shares) | shares | 0 |  |  |
Period of lease term of short-term leases | 12 months |  |  |
Forecast period of cash flow projections | 5 years |  |  |
Nominal growth rate | 2.00% |  |  |
Maximum maturity period of fair value through other comprehensive income instruments for short-term nature | 12 months |  |  |
Other current Non-current benefits | $ 94,400 | 84,200 |  |
Italy |  |  |  |
Disclosure of associates [line items] |  |  |  |
Net defined benefit liability (asset) at end of period | 10,700 |  |  |
Canada |  |  |  |
Disclosure of associates [line items] |  |  |  |
Net defined contribution plan liability (asset) at end of period | 10,400 |  |  |
USA |  |  |  |
Disclosure of associates [line items] |  |  |  |
Net defined contribution plan liability (asset) at end of period | 7,100 |  |  |
Unfunded defined benefit employee retirement plan for certain senior officers [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Net defined benefit liability (asset) at end of period | 43,100 |  |  |
Information system projects [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Total intangible assets and goodwill | 53,355 | 50,848 |  |
Licenses, patents, trademarks, and proprietary technology [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Total intangible assets and goodwill |  | 86,700 |  |
Customer-related intangible assets [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Total intangible assets and goodwill | $ 41,527 | $ 80,380 |  |
Customer-related intangible assets [member] | Maverick acquisition [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Finite-lived intangible asset, useful life (Year) | 14 years |  |  |
Customer-related intangible assets [member] | Hydrill acquisition [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Finite-lived intangible asset, useful life (Year) | 10 years |  |  |
Customer-related intangible assets [member] | Saudi Steel Pipe Company [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Finite-lived intangible asset, useful life (Year) | 9 years |  |  |
Selling, general and administrative expenses, amortization of intangible assets | $ 4,100 |  |  |
Finite-lived intangible asset, residual useful life (Year) | 3 years |  |  |
Finite-lived intangible asset, reviewed useful life (Year) | 5 years |  |  |
Intangible assets other than goodwill, useful life (Year) | 3 years |  |  |
Customer-related intangible assets [member] | Ipsco Tubulars Inc [Member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Finite-lived intangible asset, useful life (Year) | 3 years |  |  |
Finite-lived intangible asset, residual value | $ 41,500 |  |  |
Top of range [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Discount rate used in current estimate of value in use | 20.20% |  |  |
Percentage of voting rights held in unconsolidated entities | 50.00% |  |  |
Top of range [member] | Information system projects [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Finite-lived intangible asset, useful life (Year) | 3 years |  |  |
Top of range [member] | Licenses, patents, trademarks, and proprietary technology [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Finite-lived intangible asset, useful life (Year) | 10 years |  |  |
Bottom of range [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Discount rate used in current estimate of value in use | 13.40% |  |  |
Percentage of voting rights held in unconsolidated entities | 20.00% |  |  |
Bottom of range [member] | Licenses, patents, trademarks, and proprietary technology [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Finite-lived intangible asset, useful life (Year) | 3 years |  |  |
Global Pipe Company [Member] | Saudi Steel Pipe Company [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in joint venture | 35.00% |  |  |
Number of Board members can be appointed through the shareholders agreement | 4 |  |  |
Number of Board members | 11 |  |  |
Usiminas [member] | The new SHA [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Shares bound to SHA (in shares) | shares | 483,600,000 |  |  |
Percent of company voting capital | 68.60% |  |  |
T/T Group [member] | The new SHA [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Percent of company voting capital | 47.10% |  |  |
Ternium entitites [member] | The new SHA [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Percent of company voting capital | 39.50% |  |  |
Confab [member] | The new SHA [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Percent of company voting capital | 7.60% |  |  |
NSSMC [member] | The new SHA [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Percent of company voting capital | 45.90% |  |  |
Previdencia Usiminas [member] | The new SHA [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Percent of company voting capital | 7.00% |  |  |
Ternium S.A. [member] | Techgen s.a. [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in joint venture | 48.00% |  |  |
Tecpetrol International S.A. [member] | Techgen s.a. [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in joint venture | 30.00% |  |  |
Tenaris [member] | Techgen s.a. [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in joint venture | 22.00% |  |  |
Ternium S.A. [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate | 11.46% |  |  |
Usiminas [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Proportion of ownership interest in associate | 3.07% |  |  |
Proportion of voting rights held in associate | 5.19% |  |  |
Forecast period of cash flow projections | 5 years |  |  |
Nominal growth rate | 2.00% |  |  |
Usiminas [member] | Preference shares [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Number of shares subscribed to (in shares) | shares | 1,300,000 |  |  |
Usiminas [member] | Ordinary shares [member] |  |  |  |
Disclosure of associates [line items] |  |  |  |
Number of shares subscribed to (in shares) | shares | 36,500,000 |  |  |

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- Definition The amount of other current non-current benefits. + References No definition available. + Details
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- Definition The percent of a company's voting capital represented. + References No definition available. + Details
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- Definition The percentage of voting rights held in unconsolidated entities in which reporting entity has significant influence but not control. + References No definition available. + Details
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- Definition The period of lease term of short-term leases upon lease contract. + References No definition available. + Details
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- Definition Amount of amortization of intangible assets attributable to selling, general and administrative expenses. + References No definition available. + Details
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- Definition The amount of shares bound to SHA. + References No definition available. + Details
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