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Financial instruments (Details 7) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Financial instruments [Line Items]
Net Variation Of Hedging	$ (450)
Gains (losses) on hedging instrument, fair value hedges	3,257
Hedging Reserve In Equity Before Tax	(3,707)
Debt Hedging [Member]
Financial instruments [Line Items]
Net Variation Of Hedging	36,935
Gains (losses) on hedging instrument, fair value hedges	41,029
Hedging Reserve In Equity Before Tax	(4,094)
Investment Hedging [Member]
Financial instruments [Line Items]
Net Variation Of Hedging	(37,385)
Gains (losses) on hedging instrument, fair value hedges	(37,772)
Hedging Reserve In Equity Before Tax	387
Assets Hedging [Member]
Financial instruments [Line Items]
Net Variation Of Hedging	16,088
Gains (losses) on hedging instrument, fair value hedges	10,765
Hedging Reserve In Equity Before Tax	5,323
Liabilities Hedging [Member]
Financial instruments [Line Items]
Net Variation Of Hedging	(16,538)
Gains (losses) on hedging instrument, fair value hedges	(7,508)
Hedging Reserve In Equity Before Tax	$ (9,030)

X

- Definition

The gains (losses) on hedging instruments in fair value hedges. [Refer: Fair value hedges [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 24
-Subparagraph a
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_24_a_i&doctype=Standard&book=b
-URIDate 2020-01-01

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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X

- Definition

A component of gross equity representing the hedging reserve.

+ References

No definition available.

+ Details

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X

- Definition

Net variation of hedging.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

Name:	sqm_ClassesOfUnderlyingInstrumentAxis=sqm_InvestmentHedgingMember
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X

- Details

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X

- Details

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