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Significant accounting policies (Details Textual)	12 Months Ended
	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%

X

- Definition

Amortization Period.

+ References

No definition available.

+ Details

Name:	sqm_AmortizationPeriod
Namespace Prefix:	sqm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- References

No definition available.

+ Details

Name:	sqm_SignificantAccountingPoliciesLineItems
Namespace Prefix:	sqm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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