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Disclosures on equity (Details 8) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Noncontrolling interests Explanatory [Line Items]      
Profit (loss), attributable to non-controlling interests $ 6,751 $ 3,841 $ 2,488
Equity, noncontrolling interests 34,451 39,493  
Dividends paid to non-controlling interests $ 12,408 10,118  
SQM Potasio S.A. [Member]      
Disclosure Of Noncontrolling interests Explanatory [Line Items]      
Proportion of ownership interests held by non-controlling interests 0.00%    
Profit (loss), attributable to non-controlling interests $ 0 0  
Equity, noncontrolling interests 0 0  
Dividends paid to non-controlling interests $ 0 0  
Ajay SQM Chile S.A. [Member]      
Disclosure Of Noncontrolling interests Explanatory [Line Items]      
Proportion of ownership interests held by non-controlling interests 49.00%    
Profit (loss), attributable to non-controlling interests $ 769 910  
Equity, noncontrolling interests 8,382 8,189  
Dividends paid to non-controlling interests $ 577 1,238  
Soquimich Comercial S.A. [Member]      
Disclosure Of Noncontrolling interests Explanatory [Line Items]      
Proportion of ownership interests held by non-controlling interests 39.36168%    
Profit (loss), attributable to non-controlling interests $ 5,926 2,976  
Equity, noncontrolling interests 26,665 32,078  
Dividends paid to non-controlling interests $ 11,831 8,880  
Comercial Agrorama Ltda. [Member]      
Disclosure Of Noncontrolling interests Explanatory [Line Items]      
Proportion of ownership interests held by non-controlling interests 30.00%    
Profit (loss), attributable to non-controlling interests $ 56 (45)  
Equity, noncontrolling interests (596) (775)  
Dividends paid to non-controlling interests $ 0 0  
SQM Indonesia S.A. [Member]      
Disclosure Of Noncontrolling interests Explanatory [Line Items]      
Proportion of ownership interests held by non-controlling interests 20.00%    
Profit (loss), attributable to non-controlling interests $ 0 0  
Equity, noncontrolling interests 0 0  
Dividends paid to non-controlling interests $ 0 0  
Agrorama S.A. [Member]      
Disclosure Of Noncontrolling interests Explanatory [Line Items]      
Proportion of ownership interests held by non-controlling interests 0.00%    
Profit (loss), attributable to non-controlling interests $ 0 0  
Equity, noncontrolling interests 0 0  
Dividends paid to non-controlling interests $ 0 0  
SQM Thailand Limited [Member]      
Disclosure Of Noncontrolling interests Explanatory [Line Items]      
Proportion of ownership interests held by non-controlling interests 0.004%    
Profit (loss), attributable to non-controlling interests $ 0 0  
Equity, noncontrolling interests 0 1  
Dividends paid to non-controlling interests $ 0 $ 0