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Accounting Policies (Details Textual) R$ / shares in Units, $ / shares in Units, $ in Thousands, R$ in Millions |  |  | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2018 USD ($) | Jan. 16, 2012 | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Jan. 01, 2019 USD ($) | Apr. 10, 2018 shares | May 31, 2016 USD ($) shares | May 31, 2016 BRL (R$) R$ / shares shares | Apr. 30, 2016 USD ($) shares | Apr. 30, 2016 BRL (R$) R$ / shares shares
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current trade receivables, effect of new accounting standard | $ 6,423 |  |  |  |  |  |  |  |  |  |
Number of major business segments |  |  | 1 |  |  |  |  |  |  |  |
Number of reportable operating segments |  |  | 1 |  |  |  |  |  |  |  |
Intangible assets and goodwill at end of period |  |  | $ 1,465,965 | $ 1,660,859 |  |  |  |  |  |  |
Research and development expense |  |  | 63,400 | 63,700 | $ 68,600 |  |  |  |  |  |
Selling, general and administrative expenses, amortization of intangible assets |  |  | $ 206,672 | $ 188,550 | $ 241,238 |  |  |  |  |  |
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 |  |  | $ 91,200 | $ 79,200 |  |  |  |  |  |  |
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 |  |  | $ 106,000 | 94,800 |  |  |  |  |  |  |
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 |  |  | $ 17,300 |  |  |  |  |  |  |  |
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 |  |  | 41,200 |  |  |  |  |  |  |  |
Funded post-employment benefits [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net defined benefit liability (asset) at end of period |  |  | 146,885 | 165,485 | $ 159,612 |  |  |  |  |  |
Funded post-employment benefits [member] | CANADA |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net defined benefit liability (asset) at end of period |  |  | 8,200 |  |  |  |  |  |  |  |
Funded post-employment benefits [member] | UNITED STATES |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net defined benefit liability (asset) at end of period |  |  | 13,700 |  |  |  |  |  |  |  |
Information system projects [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets and goodwill at end of period |  |  | 66,638 | 81,746 |  |  |  |  |  |  |
Trademarks [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets and goodwill at end of period |  |  | 86,700 |  |  |  |  |  |  |  |
Customer-related intangible assets [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets and goodwill at end of period |  |  | $ 19,878 | $ 193,415 |  |  |  |  |  |  |
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 |  |  | 0 | 2 |  |  |  |  |  |  |
Selling, general and administrative expenses, amortization of intangible assets |  |  | $ 109,000 |  |  |  |  |  |  |  |
Finite-lived intangible asset, residual value |  |  | $ 19,900 |  |  |  |  |  |  |  |
Finite-lived intangible asset, residual useful life |  |  | 2 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] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate used in current estimate of value in use |  |  | 11.70% |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |
Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Discount rate used in current estimate of value in use |  |  | 8.70% |  |  |  |  |  |  |  |
Usiminas [member] | The new SHA [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares bound to SHA | shares |  |  |  |  |  |  | 483,600,000 |  |  |  |
Percent of company voting capital |  |  |  |  |  |  | 68.60% |  |  |  |
T/T Group [member] | The new SHA [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of company voting capital |  |  |  |  |  |  | 47.10% |  |  |  |
Ternium entitites [member] | The new SHA [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of company voting capital |  |  |  |  |  |  | 39.50% |  |  |  |
Confab [member] | The new SHA [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of company voting capital |  |  |  |  |  |  | 7.60% |  |  |  |
NSSMC [member] | The new SHA [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of company voting capital |  |  |  |  |  |  | 45.90% |  |  |  |
Previdencia Usiminas [member] | The new SHA [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percent of company voting capital |  |  |  |  |  |  | 7.00% |  |  |  |
Ternium s.a. [member] | Techgen s.a. [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  | 48.00% |  |  |  |  |  |  |  |
Tecpetrol International S.A. [member] | Techgen s.a. [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  | 30.00% |  |  |  |  |  |  |  |
Tenaris [member] | Techgen s.a. [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in joint venture |  |  | 22.00% |  |  |  |  |  |  |  |
Ternium s.a. [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proportion of ownership interest in associate |  |  | 11.46% |  |  |  |  |  |  |  |
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 |  |  | 3.07% |  |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |
Adoption of new accouting pronoucements [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Right-of-use assets |  |  |  |  |  | $ 260,000 |  |  |  |  |
Total lease liabilities |  |  |  |  |  | $ 260,000 |  |  |  |  |
IFRS 15 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate Impact on Revenues Cost of Sales and Selling Expenses | (700) |  |  |  |  |  |  |  |  |  |
IFRS 9 [member] |  |  |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |  |  |
Current trade receivables, effect of new accounting standard | $ (6,400) |  |  |  |  |  |  |  |  |  |

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