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Assets held for sale and detail of assets sold (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract] |  |
Land owned by Soquimich Comercial S.A. | $ 2,454 | $ 1,430
Total assets held for sale | $ 2,454 | $ 1,430

X
- References No definition available. + Details
Name: | ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSaleOrAsHeldForDistributionToOwnersAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The value of assets available for sale as of balance sheet. + References No definition available. + Details
Name: | sqm_AssetsAvailableForSale
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying value of land held for sale. + References No definition available. + Details
Name: | sqm_LandAvailableForSales
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant