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Assets held for sale (Tables) | 12 Months Ended
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Dec. 31, 2020
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] |
Disclosure of detailed information about available for sale noncurrent assets [Text Block] | The following table shows the movements in assets held for sale:
Assets held for sale |  | As of December 31, 2020 |  |  | As of December 31, 2019 |
|  | ThUS$ |  |  | ThUS$ |
Land |  |  | 1,493 |  |  |  | 2,454 |
Mining rights |  |  | 136 |  |  |  | - |
Total assets held for sale |  |  | 1,629 |  |  |  | 2,454 |

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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | sqm_DisclosureOfDetailedInformationAboutAvailableForSaleNoncurrentAssetsTextBlock
Namespace Prefix: | sqm_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration