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Disclosures on reserves in Equity (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Disclosures on equity [Line Items]      
Non-controlling interests $ 6,817 $ 9,733 $ 58,672
Interim Dividend 211,224 331,199 317,243
Additional dividend 0 100,000 0
Dividends payable 66,891 108,631 107,358
Owners of the Parent 278,115 5,398,300 424,601
Dividends discounted from equity for the period 284,932 [1] 549,563 [1] 483,273
Ajay SQM Chile S.A. Dividends [member]      
Disclosure of Disclosures on equity [Line Items]      
Non-controlling interests 882 823 55,501
Soquimich Comercial S.A. Interim Dividend [member]      
Disclosure of Disclosures on equity [Line Items]      
Non-controlling interests 3,936 7,872 0
Soquimich Comercial S.A. Payable Dividend [member]      
Disclosure of Disclosures on equity [Line Items]      
Non-controlling interests $ 1,999 $ 1,038 $ 3,171
[1] See Note 19.6