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Related party disclosures (Details)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Related party disclosures [Line Items]    
Tax ID 96,529,340-k Oman
Country of origin Jordan [1] United States
Functional currency CLP Turkish Lira [2]
Nature Joint venture Joint venture
Nitratos Naturais Do Chile Ltda. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Brazil  
Functional currency US$  
Nature Subsidiary  
Nitrate Corporation Of Chile Ltd. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin United Kingdom  
Functional currency US$  
Nature Subsidiary  
SQM North America Corp. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin United States  
Functional currency US$  
Nature Subsidiary  
SQM Europe N.V. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Belgium  
Functional currency US$  
Nature Subsidiary  
Soquimich S.R.L. Argentina [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Argentina  
Functional currency US$  
Nature Subsidiary  
Soquimich European Holding B.V. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin The Netherlands  
Functional currency US$  
Nature Subsidiary  
SQM Corporation N.V. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin The Netherlands  
Functional currency US$  
Nature Subsidiary  
SQI Corporation N.V. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin The Netherlands  
Functional currency US$  
Nature Subsidiary  
SQM Comercial De Mexico S.A. de C.V. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Mexico  
Functional currency US$  
Nature Subsidiary  
North American Trading Company [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin United States  
Functional currency US$  
Nature Subsidiary  
Administracion y Servicios Santiago S.A. de C.V. [Member]    
Related party disclosures [Line Items]    
Country of origin Mexico  
Functional currency US$  
Nature Subsidiary  
SQM Peru S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Peru  
Functional currency US$  
Nature Subsidiary  
SQM Ecuador S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Ecuador  
Functional currency US$  
Nature Subsidiary  
SQM Nitratos Mexico S.A. de C.V. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Mexico  
Functional currency US$  
Nature Subsidiary  
SQMC Holding Corporation L.L.P. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin United States  
Functional currency US$  
Nature Subsidiary  
SQM Investment Corporation N.V. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin The Netherlands  
Functional currency US$  
Nature Subsidiary  
SQM Brasil Limitada [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Brazil  
Functional currency US$  
Nature Subsidiary  
SQM France S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin France  
Functional currency US$  
Nature Subsidiary  
SQM Japan Co. Ltd. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Japan  
Functional currency US$  
Nature Subsidiary  
Royal Seed Trading Corporation A.V.V. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Aruba  
Functional currency US$  
Nature Subsidiary  
SQM Oceania Pty Limited [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Australia  
Functional currency US$  
Nature Subsidiary  
Rs Agro-Chemical Trading Corporation A.V.V. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Aruba  
Functional currency US$  
Nature Subsidiary  
SQM Indonesia S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Indonesia  
Functional currency US$  
Nature Subsidiary  
SQM Virginia L.L.C. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin United States  
Functional currency US$  
Nature Subsidiary  
SQM Italia SRL [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Italy  
Functional currency US$  
Nature Subsidiary  
Comercial Caiman Internacional S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Panama  
Functional currency US$  
Nature Subsidiary  
SQM Africa Pty Ltd. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin South Africa  
Functional currency US$  
Nature Subsidiary  
SQM Colombia SAS [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Colombia  
Functional currency US$  
Nature Subsidiary  
SQM Internacional NV Member [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Belgium  
Functional currency US$  
Nature Subsidiary  
SQM Lithium Specialties LLC [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin United States  
Functional currency US$  
Nature Subsidiary  
SQM Iberian S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Spain  
Functional currency US$  
Nature Subsidiary  
SQM Beijing Commercial Co. Ltd. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin China  
Functional currency US$  
Nature Subsidiary  
SQM Thailand Limited [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Thailand  
Functional currency US$  
Nature Subsidiary  
SQM Australia Pty [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Australia  
Functional currency Australian dollar  
Nature Subsidiary  
SACAL S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Argentina  
Functional currency Argentine peso  
Nature Subsidiary  
Comercial Hydro S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID 96,801,610-5  
Country of origin Chile  
Functional currency US$  
Nature Subsidiary  
SQM Potasio S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID 96,651,060-9  
Country of origin Chile  
Functional currency US$  
Nature Subsidiary  
SQM Nitratos S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID 96,592,190-7  
Country of origin Chile  
Functional currency US$  
Nature Subsidiary  
Ajay SQM Chile S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID 96,592,180-K  
Country of origin Chile  
Functional currency US$  
Nature Subsidiary  
SQMC Internacional Ltda. [Member]    
Related party disclosures [Line Items]    
Tax ID 86,630,200-6  
Country of origin Chile  
Functional currency Chilean peso  
Nature Subsidiary  
SQM Industrial S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID 79,947,100-0  
Country of origin Chile  
Functional currency US$  
Nature Subsidiary  
Isapre Norte Grande Ltda. [Member]    
Related party disclosures [Line Items]    
Tax ID 79,906,120-1  
Country of origin Chile  
Functional currency Chilean peso  
Nature Subsidiary  
Almacenes y Depositos Ltda. [Member]    
Related party disclosures [Line Items]    
Tax ID 79,876,080-7  
Country of origin Chile  
Functional currency Chilean peso  
Nature Subsidiary  
Servicios Integrales de Transitos y Transferencias S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID 79,770,780-5  
Country of origin Chile  
Functional currency US$  
Nature Subsidiary  
Soquimich Comercial S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID 79,768,170-9  
Country of origin Chile  
Functional currency US$  
Nature Subsidiary  
SQM Salar S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID 79,626,800-K  
Country of origin Chile  
Functional currency US$  
Nature Subsidiary  
Proinsa Ltda. [Member]    
Related party disclosures [Line Items]    
Tax ID 78,053,910-0  
Country of origin Chile  
Functional currency Chilean peso  
Nature Subsidiary  
Doktor Tarsa Tarim Sanayi AS [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin Turkey  
Functional currency YTL  
Nature Associate  
Charlee SQM Thailand Co. Ltd. [Member]    
Related party disclosures [Line Items]    
Tax ID [3],[4] Foreign  
Country of origin [4] Thailand [3] Thailand
Functional currency [4] Thai baht Thai baht
Nature [4] Associate [3] Associate
Minera Exar S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID [5],[6] Foreign  
Country of origin [5] Argentina  
Functional currency [5] US$  
Nature [5],[6] Joint venture  
SQM Shanghai Chemicals Co Ltd [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Country of origin China  
Functional currency US$  
Nature Subsidiary  
Ara Dos Primera del Salar de Pampa Blanca, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Ara Tres Primera del Salar de Pampa Blanca, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Ara Cuatro Primera del Salar de Pampa Blanca Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Ara Cinco Primera del Salar de Pampa Blanca, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Curicó Dos Primera del Salar de Pampa Alta, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Curicó Tres Primera del Sector de Pampa Alta, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Evelyn Veinticuatro Primera de Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Filomena Tres Primera de Oficina Filomena, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Filomena Cuatro Primera de Oficina Filomena, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Francis Cuatro Primera de Pampa Blanca, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Francis Cuatro Segunda del Salar de Pampa Blanca, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Francis Cuatro Tercera de Pampa Blanca, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Francis Cuatro Cuarta de Pampa Blanca, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Francis Cuatro Quinta de Pampa Blanca, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Francis Primera del Salar de Pampa Blanca de Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Francis Segunda del Salar de Pampa Blanca de Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Francis Tercera del Salar de Pampa Blanca de Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Ivon Primera de Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Ivon Décima Segunda de Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Ivon Sexta de Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Julia Primera de Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Lorena Trigésimo Quinta de Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Perseverancia Primera de Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Tamara 40 Primera del Sector S.E. OF. Concepción, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Tamara Tercera de Oficina Concepción, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
Tamara 40 Segunda del Sector S.E. OF Concepción, Sierra Gorda [Member]    
Related party disclosures [Line Items]    
Tax ID [7] N/A  
Country of origin [7] Chile  
Functional currency [7] Chilean peso  
Nature [7] Other related parties  
[1] These Companies are subsidiaries of the joint venture Abu Dhabi Fertilizer Industries WWL
[2] These Companies are subsidiaries of the associate Doktor Tarsa Tarim Sanayi AS.
[3] As of November 2018, the ownership interest in Charlee SQM Thailand Co. Ltd. was sold.
[4] During the month of November 2018, the stake held in Charlee SQM Thailand Co. Ltd. was sold.
[5] During the month of December 2018, the stake held in Minera Exar S.A.
[6] During the month of December 2018, the stake held in Minera Exar S.A. was sold.
[7] Correspond to Mining Contractual Societies