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Related party disclosures (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Related party disclosures [Line Items]      
Tax ID 96,529,340-k Oman  
Nature Joint venture Joint venture  
Country of origin Jordan [1] United States  
Transaction Sale of products    
Revenue from sale of goods, related party transactions $ 149,978 $ 268,237 $ 212,191
Dividend income 2,807    
Revenue from rendering of services, related party transactions 0    
Amounts receivable, related party transactions [2] $ 0    
Doktor Tarsa Tarim Sanayi AS [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin Turkey    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   17,538 11,619
Ajay Europe S.A.R.L [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin France    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   15,706 17,977
Ajay Europe S,A.R.L. [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin France    
Transaction Dividends    
Dividend income   969 1,338
Ajay North America LLC. [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin United States    
Transaction Sale of products    
Revenue from sale of goods, related party transactions $ 16,810 13,206 12,865
Abu Dhabi Fertilizer Industries WWL [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin United Arab Emirates    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   $ 4,351 8,312
Charlee SQM Thailand Co. Ltd. [Member]      
Related party disclosures [Line Items]      
Tax ID [3],[4] Foreign    
Nature [4] Associate [3] Associate  
Country of origin [4] Thailand [3] Thailand  
Transaction [3] Sale of products    
Revenue from sale of goods, related party transactions [3] $ 4,960 $ 5,102 3,798
Sales de Magnesio Ltda. [Member]      
Related party disclosures [Line Items]      
Tax ID 77.557.430-5    
Nature Associate    
Country of origin Chile    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   45 0
Kowa Company Ltd. [Member]      
Related party disclosures [Line Items]      
Tax ID [5] Foreign    
Nature [5] Other related parties    
Country of origin [5] Japan    
Transaction [5] Sale of products    
Revenue from sale of goods, related party transactions [5]   132,495 91,678
SQM Vitas Brasil Agroindustria [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint control or significant influence    
Country of origin Brazil    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   31,137 17,686
SQM Vitas Peru S.A.C. [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint control or significant influence    
Country of origin Peru    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   23,058 22,090
SQM Vitas Fzco. [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint venture    
Country of origin United Arab Emirates    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   85 965
Sichuan SQM Migao Chemical Fertilizers Co Ltda. [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint venture    
Country of origin China    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   0 9,950
Coromandel SQM India [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint venture    
Country of origin India    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   8,011 4,630
SQM Vitas Spain [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint venture    
Country of origin Spain    
Revenue from sale of goods, related party transactions   0 5,528
SQM Vitas Plantacote B.V [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint venture    
Country of origin Netherlands    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   0 49
SQM Star Qingdao Corp Nutrition Co., Ltd. [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint venture    
Country of origin China    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   200 166
SQM Vitas Holland B.V. [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint venture    
Country of origin Holland    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   0 634
Callegari Agricola S.A. [Member]      
Related party disclosures [Line Items]      
Tax ID 79.049.778-9    
Nature Other related parties    
Country of origin Chile    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   210 44
Minera Exar S.A. [Member]      
Related party disclosures [Line Items]      
Tax ID [2],[6] Foreign    
Nature [2],[6] Joint venture    
Country of origin [6] Argentina    
Transaction [2] Loans    
Amounts receivable, related party transactions [2]   11,000 0
Terra Tarsa Ukraine LLC [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin Turkey    
Transaction Sale of services    
Revenue from rendering of services, related party transactions   1,218 0
Terra Tarsa Don LLC [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin Russian Federation    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   423 0
Plantacote N.V [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin Belgium    
Transaction Sale of products    
Revenue from sale of goods, related party transactions   2,108 0
Ajay North America LLC. [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin United States    
Transaction Dividends    
Dividend income   1,123 2,605
Charlee SQM Thailand Co. Ltd. [Member]      
Related party disclosures [Line Items]      
Tax ID [3] Foreign    
Nature [3] Associate    
Country of origin [3] Thailand    
Transaction [3] Dividends    
Dividend income [3]   0 0
Sichuan SQM Migao Chemical Fertilizers Co Ltda. [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint venture    
Country of origin China    
Transaction Sale of services    
Revenue from rendering of services, related party transactions   252 257
Abu Dhabi Fertilizer Industries WWL [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin United Arab Emirates    
Transaction Dividends    
Dividend income   0 0
SQM Eastmed Turkey [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Associate    
Country of origin Turkey    
Transaction Sale of products    
Revenue from sale of goods, related party transactions $ 30 0 0
Pavoni & C, SPA [Member]      
Related party disclosures [Line Items]      
Tax ID Foreign    
Nature Joint venture    
Country of origin Italy    
Transaction Sale of products    
Revenue from sale of goods, related party transactions $ 201 0 0
Arpa Speciali SRL [Member]      
Related party disclosures [Line Items]      
Tax ID Foreing    
Nature Other related parties    
Country of origin Italy    
Transaction Sale of products    
Revenue from sale of goods, related party transactions $ 207 $ 0 $ 0
[1] These Companies are subsidiaries of the joint venture Abu Dhabi Fertilizer Industries WWL
[2] During the month of December 2018, the stake held in Minera Exar S.A. was sold.
[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] As of December 31, 2018, Kowa Company Ltd. is not considered a related party.
[6] During the month of December 2018, the stake held in Minera Exar S.A.