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v3.20.4

Significant accounting policies (Details Textual) | 12 Months Ended
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Dec. 31, 2020
Significant accounting policies [Line Items] |
Amortization Period | 10 years
Bottom of range [member] |
Significant accounting policies [Line Items] |
Cash dividend rate | 30.00%

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- Definition Amortization Period. + References No definition available. + Details
Name: | sqm_AmortizationPeriod
Namespace Prefix: | sqm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of cash dividend the company expected to pay. + References No definition available. + Details
Name: | sqm_CashDividendRate
Namespace Prefix: | sqm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | sqm_SignificantAccountingPoliciesLineItems
Namespace Prefix: | sqm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |