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Background of companies included in consolidation (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Background of companies included in consolidation [Line Items]      
Profit (loss) attributable to non-controlling interests $ 2,397 $ 733 $ 3,641
Equity, non-controlling interests 52,311 59,647  
Total $ 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  
Equity, non-controlling interests 0 0  
Total $ 0 0  
SQM Potasio S.A.      
Background of companies included in consolidation [Line Items]      
% of interests in the ownership held by non- controlling interests. 0.00%    
Profit (loss) attributable to non-controlling interests $ 0 0  
Equity, non-controlling interests 0 0  
Total $ 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 $ 1,176 1,023  
Equity, non-controlling interests 8,659 8,306  
Total $ 823 989  
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  
Equity, non-controlling interests 1 1  
Total $ 0 0  
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 $ 1,375 100  
Equity, non-controlling interests 41,855 49,247  
Total $ 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 $ (318) (403)  
Equity, non-controlling interests (481) (184)  
Total $ 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  
Total $ 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  
Equity, non-controlling interests 2,277 2,277  
Total $ 0 0  
SQM (Thailand) Limited.      
Background of companies included in consolidation [Line Items]      
% of interests in the ownership held by non- controlling interests. 0.004%    
Profit (loss) attributable to non-controlling interests $ 0 0  
Equity, non-controlling interests 0 0  
Total $ 0 $ 0