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Identification and Activities of the Company and Subsidiaries (Details 1)
Dec. 31, 2019
Dec. 31, 2019
Employees
Dec. 31, 2018
Dec. 31, 2018
Employees
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees 124 5,741 123 5,290
Executives [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   121   122
Professionals [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   1,280   1,193
Technicians and operators [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   3,763   3,547
Foreign employees [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   577   428
SQM S.A [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   439   419
SQM S.A [Member] | Executives [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   30   33
SQM S.A [Member] | Professionals [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   110   115
SQM S.A [Member] | Technicians and operators [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   282   260
SQM S.A [Member] | Foreign employees [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   17   11
Other Subsidiaries [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   5,302   4,871
Other Subsidiaries [Member] | Executives [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   91   89
Other Subsidiaries [Member] | Professionals [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   1,170   1,078
Other Subsidiaries [Member] | Technicians and operators [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   3,481   3,287
Other Subsidiaries [Member] | Foreign employees [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   560   417