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Financial instruments (Details 17) - Series H bonds [Member] - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2018
Financial instruments [Line Items]
Hedge		$ 1,952	$ 495
Principal payment [Member]
Financial instruments [Line Items]
Repayments of bonds, notes and debentures	$ 7,691	$ 7,868	$ 8,325

X

- Definition

The cash outflow for repayments of bonds, notes and debentures.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2019-01-01
-Paragraph 17
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_17&doctype=Standard
-URIDate 2019-03-27

+ 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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Namespace Prefix:	sqm_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Payments for financial instruments hedging.

+ References

No definition available.

+ Details

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Namespace Prefix:	sqm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sqm_ClassesOfRepaymentAxis=sqm_PrincipalPaymentMember
Namespace Prefix:
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Balance Type:
Period Type: