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Financial instruments (Details 26) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Financial instruments [Line Items] |  |
Financial assets pledged as collateral for liabilities or contingent liabilities | $ 771 | $ 685
Isapre Norte Grande Ltda. [Member] | Restricted cash [Member] |  |
Financial instruments [Line Items] |  |
Financial assets pledged as collateral for liabilities or contingent liabilities | $ 771 | $ 685

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- Definition The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 14 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_14_a&doctype=Standard -URIDate 2017-03-09 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | ifrs-full_SignificantInvestmentsInSubsidiariesAxis=sqm_IsapreNorteGrandeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=sqm_RestrictedCashMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |