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Disclosures on reserves in Equity (Details 6) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Background of companies included in consolidation [Line Items]      
Profit (loss) attributable to non-controlling interests $ 2,711 $ 2,397 $ 733
Equity, non-controlling interests 48,205 52,311 59,646
Total $ 6,817 9,733 2,253
Proinsa Ltda.      
Background of companies included in consolidation [Line Items]      
% of interests in the ownership held by non- controlling interests. 0.10%    
Profit (loss) attributable to non-controlling interests $ 0 0 0
Equity, non-controlling interests 0 0 0
Total $ 0 0 0
SQM Potasio S.A.      
Background of companies included in consolidation [Line Items]      
% of interests in the ownership held by non- controlling interests. 0.00001%    
Profit (loss) attributable to non-controlling interests $ 0 0 0
Equity, non-controlling interests 0 0 0
Total $ 0 0 0
Ajay SQM Chile S.A.      
Background of companies included in consolidation [Line Items]      
% of interests in the ownership held by non- controlling interests. 49.00%    
Profit (loss) attributable to non-controlling interests $ 740 1,176 1,023
Equity, non-controlling interests 8,517 8,659 8,306
Total $ 882 823 989
Soquimich Comercial S.A.      
Background of companies included in consolidation [Line Items]      
% of interests in the ownership held by non- controlling interests. 39.36168%    
Profit (loss) attributable to non-controlling interests $ 1,999 1,375 100
Equity, non-controlling interests 38,103 41,855 49,247
Total $ 5,935 8,910 1,264
Comercial Agrorama Ltda.      
Background of companies included in consolidation [Line Items]      
% of interests in the ownership held by non- controlling interests. 30.00%    
Profit (loss) attributable to non-controlling interests $ (251) (318) (403)
Equity, non-controlling interests (693) (481) (184)
Total $ 0 0 0
Agrorama S.A.      
Background of companies included in consolidation [Line Items]      
% of interests in the ownership held by non- controlling interests. 0.001%    
Profit (loss) attributable to non-controlling interests $ 0 0  
Equity, non-controlling interests 0 0 0
Total $ 0 0 0
Orcoma Estudios SPA      
Background of companies included in consolidation [Line Items]      
% of interests in the ownership held by non- controlling interests. 49.00%    
Profit (loss) attributable to non-controlling interests $ 0 0 0
Equity, non-controlling interests 2,277 2,277 2,277
Total $ 0 0 0
SQM Indonesia S.A.      
Background of companies included in consolidation [Line Items]      
% of interests in the ownership held by non- controlling interests. 20.00%    
Profit (loss) attributable to non-controlling interests $ 0 0 0
Equity, non-controlling interests 1 1 0
Total $ 0 $ 0 $ 0