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Organization and Subsidiaries (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Organization and Subsidiaries [Abstract] |
Schedule of subsidiaries by business activity |
|  | Percentage of Ownership |  |  |  |
|  | Direct |  | Total |  | Line of Business |  | Registered
Alabama Sand and Gravel, Inc. |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
Alden Resources, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
Alden Sales Corporation, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
ARL Resources, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
ARL Services, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
Core Metals Group Holdings, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
Core Metals Group, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
Gatliff Services, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
GBG Holdings, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
Globe Metallurgical Inc. |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
Globe Metals Enterprises, Inc. |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
GSM Alloys I, Inc. |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
GSM Alloys II, Inc. |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
GSM Enterprises Holdings, Inc. |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
GSM Enterprises, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
GSM Sales, Inc. |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
LF Resources, Inc. |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
Metallurgical Process Materials, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
Norchem, Inc. |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Florida - USA
QSIP Canada ULC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Canada
Quebec Silicon General Partner |  | — |  | 51.0 |  | Electrometallurgy - North America |  | Canada
Quebec Silicon Limited Partnership |  | — |  | 51.0 |  | Electrometallurgy - North America |  | Canada
Tennessee Alloys Company, LLC |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
West Virginia Alloys, Inc. |  | — |  | 100.0 |  | Electrometallurgy - North America |  | Delaware - USA
WVA Manufacturing, LLC |  | — |  | 51.0 |  | Electrometallurgy - North America |  | Delaware - USA
Cuarzos Industriales, S.A.U. |  | — |  | 100.0 |  | Electrometallurgy - Europe |  | A Coruña - Spain
Ferroatlántica del Cinca, S.L. (1) |  | — |  | 99.9 |  | Electrometallurgy - Europe |  | Spain
Ferroatlántica, S.A.U. (2) |  | — |  | 100.0 |  | Electrometallurgy - Europe |  | Madrid - Spain
Ferroglobe Mangan Norge AS (1) |  | — |  | 100.0 |  | Electrometallurgy - Europe |  | Norway
Ferroglobe Manganese France SAS (1) |  | — |  | 100.0 |  | Electrometallurgy - Europe |  | France
FerroPem, S.A.S. |  | — |  | 100.0 |  | Electrometallurgy - Europe |  | France
Grupo FerroAtlántica, S.A.U |  | 100 |  | 100.0 |  | Electrometallurgy - Europe |  | Madrid - Spain
Islenska Kisilfelagio EHF (Icelandic Silicon Corp.) |  | — |  | 20.1 |  | Electrometallurgy - Europe |  | Iceland
Kintuck (France) SAS (1) |  | — |  | 100.0 |  | Electrometallurgy - Europe |  | France
Kintuck AS (1) |  | — |  | 100.0 |  | Electrometallurgy - Europe |  | Norway
Rocas, Arcillas y Minerales, S.A. |  | — |  | 66.7 |  | Electrometallurgy - Europe |  | A Coruña - Spain
Rebone Mining (Pty.), Ltd. |  | — |  | 74.0 |  | Electrometallurgy - South Africa |  | Polokwane - South Africa
Silicon Smelters (Pty.), Ltd. |  | — |  | 100.0 |  | Electrometallurgy - South Africa |  | Polokwane - South Africa
Silicon Technology (Pty.), Ltd. |  | — |  | 100.0 |  | Electrometallurgy - South Africa |  | South Africa
Thaba Chueu Mining (Pty.), Ltd. |  | — |  | 74.0 |  | Electrometallurgy - South Africa |  | Polokwane - South Africa
16 Front Street, LLC |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
Actifs Solaires Bécancour, Inc |  | — |  | 100.0 |  | Other segments |  | Canada
Cuarzos Indus. de Venezuela (Cuarzoven), S.A. |  | — |  | 100.0 |  | Other segments |  | Venezuela
Emix, S.A.S. |  | — |  | 100.0 |  | Other segments |  | France
ECPI, Inc. |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
FerroAtlántica Canada Company Ltd |  | — |  | 100.0 |  | Other segments |  | Canada
Ferroatlántica de México, S.A. de C.V. |  | — |  | 100.0 |  | Other segments |  | Nueva León - Mexico
Ferroatlántica de Venezuela (FerroVen), S.A. |  | — |  | 99.9 |  | Other segments |  | Venezuela
Ferroatlántica Deutschland, GmbH |  | — |  | 100.0 |  | Other segments |  | Germany
Ferroatlántica do Brasil Mineraçao Ltda. |  | — |  | 70.0 |  | Other segments |  | Brazil
Ferroatlántica I+D, S.L.U. |  | — |  | 100.0 |  | Other segments |  | Madrid - Spain
FerroAtlántica India Private Limited |  | — |  | 100.0 |  | Other segments |  | India
FerroAtlántica International Ltd |  | — |  | 100.0 |  | Other segments |  | United Kingdom
Ferroatlántica y Cía., F. de Ferroaleac. y Metales, S.C. |  | — |  | 100.0 |  | Other segments |  | Madrid - Spain
Ferroatlántica, S.A.U. (2) |  | — |  | 100.0 |  | Other segments |  | Madrid - Spain
Ferroglobe Services (UK) PLC |  | 100 |  | 100.0 |  | Other segments |  | United Kingdom
FerroManganese Mauritania SARL |  | — |  | 90.0 |  | Other segments |  | Mauritania
Ferroquartz Company Inc. |  | — |  | 100.0 |  | Other segments |  | Canada
Ferroquartz Holdings, Ltd (Hong Kong) |  | — |  | 100.0 |  | Other segments |  | Hong Kong
FerroQuartz Mauritania SARL |  | — |  | 90.0 |  | Other segments |  | Mauritania
FerroQuébec Company Inc. |  | — |  | 100.0 |  | Other segments |  | Canada
Ferrosolar OPCO Group SL. |  | — |  | 75.0 |  | Other segments |  | Spain
Ferrosolar R&D SL. |  | — |  | 51.0 |  | Other segments |  | Spain
FerroTambao, SARL |  | — |  | 90.0 |  | Other segments |  | Burkina Faso
Ganzi Ferroatlántica Silicon Industry Company, Ltd. |  | — |  | 75.0 |  | Other segments |  | Sichuan - China
GBG Financial LLC |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
GBG Holdings, LLC |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
Globe Argentina Holdco, LLC |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
Globe BG, LLC |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
Globe LSE, Inc. |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
Globe Metales S.R.L. |  | — |  | 100.0 |  | Other segments |  | Argentina
Globe Metallurgical Carbon, LLC |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
Globe Specialty Metals, Inc. |  | 100 |  | 100.0 |  | Other segments |  | Delaware - USA
GSM Financial, Inc. |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
GSM Netherlands, BV |  | — |  | 100.0 |  | Other segments |  | Netherlands
Laurel Ford Resources, Inc. |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
Mangshi FerroAtlántica Mining Indus. Serv. Ltd |  | — |  | 100.0 |  | Other segments |  | Mangshi, Dehong -Yunnan -China
Mangshi Sinice Silicon Industry Company Limited |  | — |  | 100.0 |  | Other segments |  | Mangshi, Dehong -Yunnan -China
MST Financial Holdings, LLC |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
MST Financial, LLC |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
MST Resources, LLC |  | — |  | 100.0 |  | Other segments |  | Delaware - USA
Ningxia Yonvey Coal Industrial Co., Ltd. |  | — |  | 98.0 |  | Other segments |  | China
Photosil Industries, SAS |  | — |  | 100.0 |  | Other segments |  | France
Silicio Ferrosolar, SLU |  | — |  | 100.0 |  | Other segments |  | Spain
Solsil, Inc. |  | — |  | 92.4 |  | Other segments |  | Delaware - USA
Ultra Core Polska (UCP) |  | — |  | 100.0 |  | Other segments |  | Poland
Ultracore Energy SA |  | — |  | 100.0 |  | Other segments |  | Argentina
| (1) |  | Entered into the scope of consolidation during 2018.
| (2) |  | FerroAtlántica, S.A.U. carries on business activities in both “Electrometallurgy – Europe” and “Other segments” (energy business)

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