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Employee benefits (Details 7) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Actuarial assumption of discount rates [member] |  |
Employee benefits [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | $ (1,807) | $ (1,991)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | 2,033 | 2,436
Actuarial assumption of employee turnover rate [Member] |  |
Employee benefits [Line Items] |  |
Increase (decrease) in defined benefit obligation due to reasonably possible increase in actuarial assumption | (237) | (252)
Increase (decrease) in defined benefit obligation due to reasonably possible decrease in actuarial assumption | $ 265 | $ 281

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2018-01-01 -Paragraph 145 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=19&date=2018-03-01&anchor=para_145_a&doctype=Standard -URIDate 2018-03-16 + Details
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- References No definition available. + Details
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Namespace Prefix: | sqm_
Data Type: | xbrli:stringItemType
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |