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Related party disclosures (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Related party disclosures [Line Items]    
Tax ID 96,529,340-k Oman
Nature Joint venture Joint venture
Country of origin Jordan [1] United States
Currency CLP Turkish Lira [2]
Current receivables due from related parties $ 44,554 $ 59,132
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
Currency [4] Thai baht Thai baht
Current receivables due from related parties $ 0 $ 1,204
Ajay Europe SARL [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Associate  
Country of origin France  
Currency Euro  
Current receivables due from related parties $ 3,756 4,689
Ajay North America LLC. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Associate  
Country of origin United States  
Currency US$  
Current receivables due from related parties $ 2,079 2,005
Abu Dhabi Fertilizer Industries WWL [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Associate  
Country of origin United Arab Emirates  
Currency Arab Emirates dirham  
Current receivables due from related parties $ 857 73
Kowa Company Ltd. [Member]    
Related party disclosures [Line Items]    
Tax ID [5] Foreign  
Nature [5] Other related parties  
Country of origin [5] Japan  
Currency US$  
Current receivables due from related parties $ 0 5,008
Soc.de Inversiones Pampa Calichera [Member]    
Related party disclosures [Line Items]    
Tax ID 96.511.530-7  
Nature Jointly controlled entity  
Country of origin Chile  
Currency US$  
Current receivables due from related parties $ 6 6
SQM Vitas Brazil Agroindustria [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Joint venture  
Country of origin Brazil  
Currency US$  
Current receivables due from related parties $ 15,818 17,293
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  
Currency US$  
Current receivables due from related parties $ 12,768 13,766
Coromandel SQM India [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Joint venture  
Country of origin India  
Currency Indian rupee  
Current receivables due from related parties $ 2,025 3,804
Sichuan SQM Migao Chemical Fertilizers Co Ltda. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Joint venture  
Country of origin China  
Currency Emirates dirham  
Current receivables due from related parties $ 105 0
SQM Vitas Fzco. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Joint venture  
Country of origin United Arab Emirates  
Currency US$  
Current receivables due from related parties $ 248 50
SQM Vitas Plantacote B.V [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Joint venture  
Country of origin Netherlands  
Currency Euro  
Current receivables due from related parties $ 312 190
SQM Star Qingdao Corp Nutrition Co., Ltd. [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Joint venture  
Country of origin China  
Currency Russian ruble  
Current receivables due from related parties $ 41 44
Plantacote N.V [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Associate  
Country of origin Belgium  
Currency US$  
Current receivables due from related parties $ 0 11,000
Terra Tarsa Don LLC [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Associate  
Country of origin Russian Federation  
Currency Euro  
Current receivables due from related parties $ 30  
Minera Exar S.A. [Member]    
Related party disclosures [Line Items]    
Tax ID [6],[7] Foreign  
Nature [6],[7] Joint venture  
Country of origin [6] Argentina  
Currency [6] US$  
Current receivables due from related parties $ 19,500 0
SQM Eastmed Turkey [Member]    
Related party disclosures [Line Items]    
Tax ID Foreign  
Nature Associate  
Country of origin Turkey  
Current receivables due from related parties   0
Pavoni And C Spa [Member]    
Related party disclosures [Line Items]    
Tax ID Foreing  
Nature Joint venture  
Country of origin Italy  
Currency Euro  
Current receivables due from related parties $ 12 $ 0
[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] 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.
[7] During the month of December 2018, the stake held in Minera Exar S.A. was sold.