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Identification and Activities of the Company and Subsidiaries (Details)
Dec. 31, 2020
Dec. 31, 2020
Employees
Dec. 31, 2019
Dec. 31, 2019
Employees
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees 126 5,507 124 5,741
Executives [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   115   121
Professionals [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   1,250   1,280
Technicians and operators [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   3,577   3,763
Foreign employees [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   565   577
SQM S.A [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   408   439
SQM S.A [Member] | Executives [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   30   30
SQM S.A [Member] | Professionals [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   94   110
SQM S.A [Member] | Technicians and operators [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   267   282
SQM S.A [Member] | Foreign employees [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   17   17
Other Subsidiaries [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   5,099   5,302
Other Subsidiaries [Member] | Executives [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   85   91
Other Subsidiaries [Member] | Professionals [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   1,156   1,170
Other Subsidiaries [Member] | Technicians and operators [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   3,310   3,481
Other Subsidiaries [Member] | Foreign employees [Member]        
Disclosure Of Information About Employees Explanatory [Line Items]        
Number of employees   548   560