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Significant accounting policies (Details Textual)	Dec. 31, 2018	Dec. 31, 2017
Significant accounting policies [Line Items]
Discount Rate For Pension Obligations	4.642%	5.114%
SQM North America [Member]
Significant accounting policies [Line Items]
Discount Rate For Pension Obligations	3.75%	4.50%

X

- Definition

Represents the discount rate for pension obligation.

+ References

No definition available.

+ Details

Name:	sqm_DiscountRateForPensionObligations
Namespace Prefix:	sqm_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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_GeographicalAreasAxis=sqm_SQMNorthAmericaCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: