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Railway for transportation of products between the site Coya Sur and the Port of Tocopilla (Details Textual) $ in Millions | 9 Months Ended
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Sep. 30, 2017 USD ($)
Disclosure of Railway for transportation of products between the site Coya Sur and the Port of Tocopilla [Line Items] |
Transportation expense | $ 32
Percentage for Transportation expense in total assets | 0.70%

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- Definition The amount of expense arising from transportation services. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_112_c&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_TransportationExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Definition The Percentage represent the Transportation expense in total assets. + References No definition available. + Details
Name: | sqm_PercentageForTransportationExpenseInTotalAssets
Namespace Prefix: | sqm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration