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Disclosures on reserves in Equity (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Disclosures on equity [Line Items]      
Non-controlling interests $ 10,118 $ 6,817 $ 9,733
Interim Dividend 44,986 211,224 331,199
Potential Dividend 100,000 0 100,000
Dividends payable 4,369 66,891 108,631
Owners of the Parent 149,355 278,115 539,830
Dividends discounted from equity for the period [1] 159,473 284,932 549,563
Ajay SQM Chile S.A. Dividends [member]      
Disclosure of Disclosures on equity [Line Items]      
Non-controlling interests 556 882 823
Ajay SQM Chile S.A Payable Dividend [member]      
Disclosure of Disclosures on equity [Line Items]      
Non-controlling interests 682 0 0
Soquimich Comercial S.A. Interim Dividend [member]      
Disclosure of Disclosures on equity [Line Items]      
Non-controlling interests 5,904 3,936 7,872
Soquimich Comercial S.A. Payable Dividend [member]      
Disclosure of Disclosures on equity [Line Items]      
Non-controlling interests $ 2,976 $ 1,999 $ 1,038
[1] See Note 20.6