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CONSOLIDATED FINANCIAL STATEMENTS - Subsidiaries (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Gerdau GTL Spain S.L. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
Gerdau Internacional Empreendimentos Ltda. - Grupo Gerdau |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
Gerdau Ameristeel Corporation and subsidiaries |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
Gerdau Acominas S.A. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 99.36% | 99.35% | 99.35%
Gerdau Aos Longos S.A. and subsidiary |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 99.12% | 99.11% | 99.11%
Gerdau Steel Inc. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
Gerdau Holdings Inc. and subsidiary |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
Paraopeba - Fixed-income investment fund |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 10.69% | 70.93% | 65.75%
Percent of participation in investment fund | 51.11% | 91.58% | 82.64%
Gerdau Holdings Europa S.A. and subsidiaries |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) |  |  | 100.00%
Gerdau America Latina Participacoes S.A. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) |  | 99.12% | 99.12%
Gerdau Chile Inversiones Ltda. and subsidiaries |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 99.00% | 99.00% | 99.99%
Gerdau Acos Especiais S.A. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) |  | 99.55% | 99.56%
Gerdau Hungria Holdings Limited Liability Company and subsidiaries |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
GTL Equity Investments Corp. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
Empresa Siderurgica del Peru S.A.A. - Siderperu |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 90.03% | 90.03% | 90.03%
Diaco S.A. and subsidiary |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) |  | 99.68% | 99.68%
Gerdau Gtl Mexico S.A. de C.V. and subsidiaries |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
Seiva S.A. Florestas e Industrias |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 97.73% | 97.73% | 97.73%
Itagua Com. Imp. e Exp. Ltda |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) |  | 100.00% | 100.00%
Gerdau Laisa S.A. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
Sipar Gerdau Inversiones S.A. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 99.99% | 99.99% | 99.99%
Sipar Aceros S.A. and subsidiary |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 99.98% | 99.96% | 99.96%
Cleary Holdings Corp. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) |  |  | 100.00%
Sizuca - Siderurgica Zuliana C.A. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
GTL Trade Finance Inc. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
Gerdau Trade Inc. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 100.00% | 100.00% | 100.00%
Gerdau Steel India Ltd. |  |  |
Significant consolidated subsidiaries |  |  |
Equity interest in significant consolidated subsidiaries (as a percent) | 98.90% | 98.90% | 98.90%

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