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v3.19.1

Events occurred after the reporting date (Details Textual) - shares |  | 1 Months Ended
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Dec. 05, 2018 | May 31, 2018
Disclosure of Events occurred after the reporting date [Line Items] |  |
Percentage of voting equity held by entity or by its subsidiaries | 23.77% |
Number of shares in entity held by entity or by its subsidiaries or associates | 62,556,568 |
Inversiones TLC SPA [Member] |  |
Disclosure of Events occurred after the reporting date [Line Items] |  |
Number of shares reserved for issue under options and contracts for sale of shares |  | 62,556,568
Percentage of voting equity held by entity or by its subsidiaries |  | 23.77%

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- Definition The number of shares in the entity held by the entity or by its subsidiaries or associates. [Refer: Associates [member]; Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_vi&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of shares reserved for issue under options and contracts for the sale of shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 79 -Subparagraph a -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_79_a_vii&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:sharesItemType
Balance Type: | na
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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- Definition The percentage of voting interest held in enity by entity or by its subsidiaries. + References No definition available. + Details
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Namespace Prefix: | sqm_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |