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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
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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

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