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Effect of fluctuations in foreign currency exchange rates (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of effect of changes in foreign exchange rates [Abstract]  
Disclosure of foreign currency exchange differences recognized in profit or loss except for financial instruments measured at fair value through profit or loss [Text Block]
(a)
Foreign currency exchange differences recognized in profit or loss and other comprehensive income:
 
 
Foreign currency exchange differences recognized in profit or loss and other comprehensive
income
 
As of
December 31,
2020
  
As of
December 31,
2019
  
As of
December 31,
2018
 
 
 
ThUS$
 
 
ThUS$
 
 
ThUS$
 
Conversion foreign exchange gains (losses) recognized in the result of the year
 
 
(4,423
)
 
 
(2,169
)
 
 
(16,597
)
Conversion foreign exchange reserves
            
Conversion foreign exchange reserves attributable to the owners of the controlling entity  14,176   562   (1,394)
Conversion foreign exchange reserves attributable to the non-controlling entity  (176)  225   174 
Total
 
 
14,000
 
 
 
787
 
 
 
(1,220
)
Disclosure of reserve of exchange differences on translation [Text Block]
(b)
Reserves for foreign currency exchange differences:
 
As of December 31, 2020, and 2019, are detailed as follows:
 
 
Details
 
As of
December 31,
2020
  
As of
December 31,
2019
  
As of
December 31,
2018
 
 
 
ThUS$
 
 
ThUS$
 
 
ThUS$
 
Changes in equity generated by the equity method value through conversion:
            
Comercial Hydro S.A.  1,004   1,004   1,004 
SQMC Internacional Ltda.  (9)  (9)  (17)
Proinsa Ltda.  (10)  (10)  (11)
Comercial Agrorama Ltda.  (19)  33   (21)
Isapre Norte Grande Ltda.  (14)  (44)  (1)
Almacenes y Depósitos Ltda.  211   142   113 
Sacal S.A.  (3)  (3)  (3)
Sociedad Prestadora de Servicios de Salud Cruz del Norte S.A.  (13)  (19)  (10)
Agrorama S.A.  92   231   132 
Doktor Tarsa  -   (13,811)  (13,811)
SQM Vitas Fzco  (3,736)  (2,267)  (2,682)
Ajay Europe  (693)  (1,449)  (1,270)
SQM Eastmed Turkey  -   (155)  (113)
Doctochem  -   7   - 
Coromandel SQM India  -   (431)  (393)
SQM Italia SRL  -   (236)  (213)
SQM Oceanía Pty Ltd.  (579)  (634)  (634)
SQM Indonesia S.A.  (124)  (124)  (124)
Abu Dhabi Fertillizers Industries WWL.  372   372   (435)
SQM Vitas Holland  99   (197)  (170)
SQM Thailand Limited  (68)  (68)  (68)
SQM Europe  (1,983)  (1,983)  (1,983)
SQM Australia Pty Ltd.  (4,052)  (4,035)  (4,222)
Pavoni & C. Spa  164   (185)  70 
Terra Tarsa BV  -   116   (82)
Plantacote NV  -   (16)  (34)
Doktolab Tarim Arastirma San.  -   (54)  (29)
Kore Potash PLC (a)  (1,128)  (1,754)  (1,206)
SQM Colombia SAS  (80)  (166)  (94)
Total
 
 
(11,569
)
 
 
(25,745
)
 
 
(26,307
)