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Related party disclosures (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Nitratos Naturais Do Chile Ltda. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Brazil | Brazil
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Nitrate Corporation Of Chile Ltd. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | United Kingdom | United Kingdom
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM North America Corp. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | United States | United States
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Europe N.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Belgium | Belgium
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Soquimich S.R.L. Argentina [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Argentina | Argentina
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Soquimich European Holding B.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | The Netherlands | The Netherlands
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Corporation N.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | The Netherlands | The Netherlands
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQI Corporation N.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | The Netherlands | The Netherlands
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Comercial De Mexico S.A. de C.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Mexico | Mexico
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
North American Trading Company [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | United States | United States
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Administracion y Servicios Santiago S.A. de C.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Mexico | Mexico
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Peru S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Peru | Peru
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Ecuador S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Ecuador | Ecuador
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Nitratos Mexico S.A. de C.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Mexico | Mexico
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQMC Holding Corporation L.L.P. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | United States | United States
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Investment Corporation N.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | The Netherlands | The Netherlands
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Brasil Ltda. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Brazil | Brazil
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM France S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | France | France
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Japan Co. Ltd. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Japan | Japan
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Royal Seed Trading Corporation A.V.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Aruba | Aruba
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Oceania Pty Limited [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Australia | Australia
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Rs Agro-Chemical Trading Corporation A.V.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Aruba | Aruba
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Indonesia S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Indonesia | Indonesia
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Virginia L.L.C. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | United States | United States
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Italia SRL [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Italy | Italy
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Comercial Caiman Internacional S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Panamá | Panamá
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Africa Pty Ltd. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | South Africa | South Africa
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Colombia SAS [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Colombia | Colombia
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Lithium Specialties LLC [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | United States | United States
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Iberian S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Spain | Spain
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Agro India Pvt. Ltd. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | India | India
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Beijing Commercial Co. Ltd. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | China | China
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Thailand Limited [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Thailand | Thailand
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Australia PTY [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Australia | Australia
Functional currency | Australian dollar | Australian dollar
Nature | Subsidiary | Subsidiary
SACAL S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Argentina | Argentina
Functional currency | Argentine peso | Argentine peso
Nature | Subsidiary | Subsidiary
Comercial Hydro S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 96,801,610-5 | 96,801,610-5
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Potasio S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 96,651,060-9 | 96,651,060-9
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Nitratos S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 96,592,190-7 | 96,592,190-7
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Ajay SQM Chile S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 96,592,180-K | 96,592,180-K
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQMC Internacional Ltda. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 86,630,200-6 | 86,630,200-6
Country of origin | Chile | Chile
Functional currency | Chilean peso | Chilean peso
Nature | Subsidiary | Subsidiary
SQM Industrial S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 79,947,100-0 | 79,947,100-0
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Isapre Norte Grande Ltda. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 79,906,120-1 | 79,906,120-1
Country of origin | Chile | Chile
Functional currency | Chilean peso | Chilean peso
Nature | Subsidiary | Subsidiary
Almacenes y Depositos Ltda. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 79,876,080-7 | 79,876,080-7
Country of origin | Chile | Chile
Functional currency | Chilean peso | Chilean peso
Nature | Subsidiary | Subsidiary
Servicios Integrales de Transitos y Transferencias S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 79,770,780-5 | 79,770,780-5
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Soquimich Comercial S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 79,768,170-9 | 79,768,170-9
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM Salar S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 79,626,800-K | 79,626,800-K
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Proinsa Ltda. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 78,053,910-0 | 78,053,910-0
Country of origin | Chile | Chile
Functional currency | Chilean peso | Chilean peso
Nature | Subsidiary | Subsidiary
Sociedad Prestadora de Servicios de Salud Cruz del Norte S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 76,534,490-5 | 76,534,490-5
Country of origin | Chile | Chile
Functional currency | Chilean peso | Chilean peso
Nature | Subsidiary | Subsidiary
Exploraciones Mineras S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 76,425,380-9 | 76,425,380-9
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Comercial Agrorama Ltda. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 76,064,419-6 | 76,064,419-6
Country of origin | Chile | Chile
Functional currency | Chilean peso | Chilean peso
Nature | Subsidiary | Subsidiary
Agrorama S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 76,145,229-0 | 76,145,229-0
Country of origin | Chile | Chile
Functional currency | Chilean peso | Chilean peso
Nature | Subsidiary | Subsidiary
Orcoma Estudios SPA [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 76,359,919-1 | 76,359,919-1
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Orcoma SPA [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 76,360,575-2 | 76,360,575-2
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
SQM MaG SpA. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 76,686,311-9 | 76,686,311-9
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Subsidiary | Subsidiary
Abu Dhabi Fertilizer Industries WWL [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | United Arab Emirates | Arab Emirates
Functional currency | Arab Emirates dirham | Arab Emirates dirham
Nature | Associate | Associate
Doktor Tarsa Tarim Sanayi AS [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Turkey | Turkey
Functional currency | Turkish lira | Turkish lira
Nature | Associate | Associate
Ajay North America [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | United States | United States
Functional currency | US$ | US$
Nature | Associate | Associate
Ajay Europe SARL [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | France | France
Functional currency | Euro | Euro
Nature | Associate | Associate
SQM Eastmed Turkey [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Turkey | Turkey
Functional currency | Euro | Euro
Nature | Associate | Associate
Charlee SQM Thailand Co. Ltd. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Thailand | Thailand
Functional currency | Thai baht | Thai baht
Nature | Associate | Associate
Kore Potash Ltd. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Australia | Australia
Functional currency | US$ | US$
Nature | Associate | Associate
Sichuan SQM Migao Chemical Fertilizers Co Ltda. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | China | China
Functional currency | US$ | US$
Nature | Joint venture | Joint venture
Coromandel SQM India [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | India | India
Functional currency | Indian rupee | Indian rupee
Nature | Joint venture | Joint venture
SQM Vitas Fzco. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | United Arab Emirates | Arab Emirates
Functional currency | Arab Emirates dirham | Arab Emirates dirham
Nature | Joint venture | Joint venture
SQM Star Qingdao Corp Nutrition Co., Ltd. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | China | China
Functional currency | US$ | US$
Nature | Joint venture | Joint venture
SQM Vitas Holland B.V. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Holland | Dutch Antilles
Functional currency | Euro | Euro
Nature | Joint venture | Joint venture
Kowa Company Ltd. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Japan | Japan
Functional currency | US$ | US$
Nature | Joint control | Joint control
Minera Exar S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Argentina | Argentina
Functional currency | US$ | US$
Nature | Joint control | Joint control
Sociedad de Inversiones Pampa Calichera [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 96,511,530-7 | 96,511,530-7
Country of origin | Chile | Chile
Functional currency | US$ | US$
Nature | Joint control | Joint control
Norte Grande S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 96,529,340-k | 96,529,340-k
Country of origin | Chile | Chile
Functional currency | Chilean peso | Chilean peso
Nature | Other related parties | Other related parties
Callegari Agricola S.A. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | 79.049.778-9 | 79,049,778-9
Country of origin | Chile | Chile
Functional currency | Chilean peso | Chilean peso
Nature | Other related parties | Other related parties
Coromandel Internacional [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | India | India
Functional currency | Indian rupee | Indian rupee
Nature | Other related parties | Other related parties
Vitas Roullier SAS [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | France | France
Functional currency | Euro | Euro
Nature | Other related parties | Other related parties
SQM Vitas Brazil Agroindustria [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Brazil | Brazil
Functional currency | US$ | US$
Nature | Other related parties | Other related parties
SQM Vitas Peru S.A.C. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Peru | Peru
Functional currency | US$ | US$
Nature | Other related parties | Other related parties
SQM Vitas Plantacote B.V [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Netherlands | Dutch Antilles
Functional currency | Euro | Euro
Nature | Other related parties | Other related parties
Terra Tarsa B.V.. [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Holland | Holland
Functional currency | Euro | Euro
Nature | Other related parties | Other related parties
Plantacote N.V [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreing | Foreign
Country of origin | Belgium | Belgium
Functional currency | Euro | Euro
Nature | Other related parties | Other related parties
Doktolab Tarim Arastima San. Tic As [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Turkey | Turkey
Functional currency | Turkish Lira | Turkish Lira
Nature | Other related parties | Other related parties
Terra Tarsa Ukraine LLC [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Turkey | Ukraine
Functional currency | Ukrainian Grivna | Ukrainian Grivna
Nature | Other related parties | Other related parties
Terra Tarsa Don LLC [Member] |  |
Related party disclosures [Line Items] |  |
Tax ID | Foreign | Foreign
Country of origin | Russian Federation | Russian Federation
Functional currency | Russian ruble | Russian ruble
Nature | Other related parties | Other related parties

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