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Identification and Activities of the Company and Subsidiaries (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of Identification and Activities of the Company and Subsidiaries [Abstract] |
Disclosure of information about employees [text block] | As of December 31, 2020, and 2019, the workforce was as follows:
|  | As of December 31, 2020 |  |  | As of December 31, 2019 |
Employees |  | SQM S.A. |  |  | other subsidiaries |  |  | Total |  |  | SQM S.A. |  |  | other subsidiaries |  |  | Total |
Executives |  |  | 30 |  |  |  | 85 |  |  |  | 115 |  |  |  | 30 |  |  |  | 91 |  |  |  | 121 |
Professionals |  |  | 94 |  |  |  | 1,156 |  |  |  | 1,250 |  |  |  | 110 |  |  |  | 1,170 |  |  |  | 1,280 |
Technicians and operators |  |  | 267 |  |  |  | 3,310 |  |  |  | 3,577 |  |  |  | 282 |  |  |  | 3,481 |  |  |  | 3,763 |
Foreign employees |  |  | 17 |  |  |  | 548 |  |  |  | 565 |  |  |  | 17 |  |  |  | 560 |  |  |  | 577 |
Overall total |  |  | 408 |  |  |  | 5,099 |  |  |  | 5,507 |  |  |  | 439 |  |  |  | 5,302 |  |  |  | 5,741 |
Schedule of Shareholders stock and Ownership Percentage [Text Block] | The following information is derived from our registry and reports managed by the DCV and informed to the CMF and the Chilean Stock Exchanges:
Shareholders as of December 31, 2020 |  | No. of Series A |  |  | % of Series A shares |  |  | No. of Series B |  |  | % of Series B shares |  |  | % of total shares |
Inversiones TLC SpA (1) |  |  | 62,556,568 |  |  |  | 43.80 | % |  |  | - |  |  |  | - |  |  |  | 23.77 | %
The Bank of New York Mellon, ADRs |  |  | - |  |  |  | - |  |  |  | 50,792,452 |  |  |  | 42.19 | % |  |  | 19.30 | %
Sociedad de Inversiones Pampa Calichera S.A. (2) |  |  | 44,894,152 |  |  |  | 31.43 | % |  |  | 922,971 |  |  |  | 0.77 | % |  |  | 17.41 | %
Potasios de Chile S.A. |  |  | 18,179,147 |  |  |  | 12.73 | % |  |  | - |  |  |  | - |  |  |  | 6.91 | %
Inversiones Global Mining (Chile) Limitada |  |  | 8,798,539 |  |  |  | 6.16 | % |  |  | - |  |  |  | - |  |  |  | 3.34 | %
Euroamerica C de B S. A. |  |  | 1,418 |  |  |  | - |  |  |  | 8,788,517 |  |  |  | 7.30 | % |  |  | 3.34 | %
Banco Santander via foreign investor accounts |  |  | - |  |  |  | - |  |  |  | 7,294,827 |  |  |  | 6.06 | % |  |  | 2.77 | %
Banco de Chile via State Street |  |  | - |  |  |  | - |  |  |  | 6,971,782 |  |  |  | 5.79 | % |  |  | 2.65 | %
Banco de Chile non-resident third party accounts |  |  | - |  |  |  | - |  |  |  | 6,129,339 |  |  |  | 5.09 | % |  |  | 2.33 | %
Inversiones la Esperanza de Chile Limitada |  |  | 4,147,263 |  |  |  | 2.90 | % |  |  | 46,500 |  |  |  | 0.04 | % |  |  | 1.59 | %
Banchile Corredora de Bolsa S. A. |  |  | 459,202 |  |  |  | 0.32 | % |  |  | 2,426,758 |  |  |  | 2.02 | % |  |  | 1.10 | %
Banco de Chile on behalf of Citibank NA New York customers |  |  | 177,463 |  |  |  | 0.12 | % |  |  | 1,732,249 |  |  |  | 1.44 | % |  |  | 0.73 | %
Shareholders as of December 31, 2019 |  | No. of Series A |  |  | % of Series A shares |  |  | No. of Series B |  |  | % of Series B shares |  |  | % of total shares |
Inversiones TLC SpA (1) |  |  | 62,556,568 |  |  |  | 43.80 | % |  |  | - |  |  |  | - |  |  |  | 23.77 | %
Sociedad de Inversiones Pampa Calichera S.A. (2) |  |  | 44,894,152 |  |  |  | 31.43 | % |  |  | 3,793,154 |  |  |  | 3.15 | % |  |  | 18.50 | %
The Bank of New York Mellon, ADRs |  |  | - |  |  |  | - |  |  |  | 38,311,788 |  |  |  | 31.83 | % |  |  | 14.56 | %
Potasios de Chile S.A. |  |  | 18,179,147 |  |  |  | 12.73 | % |  |  | - |  |  |  | - |  |  |  | 6.91 | %
Inversiones Global Mining (Chile) Limitada |  |  | 8,798,539 |  |  |  | 6.16 | % |  |  | - |  |  |  | - |  |  |  | 3.34 | %
Banco Itaú via foreign investor accounts |  |  | - |  |  |  | - |  |  |  | 7,373,216 |  |  |  | 6.13 | % |  |  | 2.80 | %
Banco de Chile non-resident third party accounts |  |  | 109 |  |  |  | - |  |  |  | 6,842,746 |  |  |  | 5.68 | % |  |  | 2.60 | %
Banco Santander via foreign investor accounts |  |  | - |  |  |  | - |  |  |  | 6,618,416 |  |  |  | 5.50 | % |  |  | 2.51 | %
Euroamerica C de B S. A. |  |  | 3,056 |  |  |  | - |  |  |  | 4,863,467 |  |  |  | 4.04 | % |  |  | 1.85 | %
Banchile C de B S. A. |  |  | 491,729 |  |  |  | 0.34 | % |  |  | 4,285,696 |  |  |  | 3.56 | % |  |  | 1.82 | %
Inversiones la Esperanza de Chile Limitada |  |  | 4,147,263 |  |  |  | 2.90 | % |  |  | 46,500 |  |  |  | 0.04 | % |  |  | 1.59 | %
Bolsa de comercio de Santiago Bolsa de valores |  |  | 30,590 |  |  |  | 0.02 | % |  |  | 3,077,930 |  |  |  | 2.56 | % |  |  | 1.18 | %

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