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Employee benefits (Details 1) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Employee benefits [Line Items] |  |
Staff severance indemnities, Chile | $ 25,893 | $ 21,384
Plan compensación ejecutivos | 6,487 | 0
Other obligations in companies elsewhere | 1,552 | 1,148
Total other non-current liabilities | $ 33,932 | $ 22,532

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- Definition The present value of the expected payments by a retirement benefit plan to existing and past employees, attributable to the service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 26 -IssueDate 2017-01-01 -Paragraph 35 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=26&date=2017-03-01&anchor=para_35_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ActuarialPresentValueOfPromisedRetirementBenefits
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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- Definition The amount of employee benefits other obligations payable non current. + References No definition available. + Details
Name: | sqm_EmployeeBenefitsOtherObligationsPayableNonCurrent
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of non current executive compensation plan payable. + References No definition available. + Details
Name: | sqm_ExecutiveCompensationPlanPayableNonCurrent
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of staff severance indemnities payable non current. + References No definition available. + Details
Name: | sqm_StaffSeveranceIndemnitiesPayableNonCurrent
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant