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Disclosures on reserves in Equity (Details 4) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Disclosures on equity [Line Items]      
Equity before adjustments $ 15,874 $ 15,763 $ 13,009
Total Other reserves 16,318 14,086 11,332
SQM Iberian S.A. [Member]      
Disclosure of Disclosures on equity [Line Items]      
Equity before adjustments 9,464 9,464 9,464
Adjustments to equity (1,677) (1,677) (1,677)
SQM Europe N.V. [Member]      
Disclosure of Disclosures on equity [Line Items]      
Equity before adjustments 1,957 1,957 1,957
Soquimich European Holding B.V. [Member]      
Disclosure of Disclosures on equity [Line Items]      
Equity before adjustments 828 828 828
Abu Dhabi Fertilizer Industries WWL [Member]      
Disclosure of Disclosures on equity [Line Items]      
Equity before adjustments 455 455 455
Doktor Tarsa Tarim Sanayi AS [Member]      
Disclosure of Disclosures on equity [Line Items]      
Equity before adjustments 0 305 305
Kore Potash PLC [Member]      
Disclosure of Disclosures on equity [Line Items]      
Equity before adjustments 3,170 2,754 0
Orcoma Estudios SPA [Member]      
Disclosure of Disclosures on equity [Line Items]      
Adjustments to equity $ 2,121 $ 0 $ 0