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Income tax and deferred taxes (Details Textual) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Nov. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Income tax and deferred taxes [Line Items]
Applicable tax rate		27.00%	27.00%	255.00%
Prescriptive period for review legal deadline		3
Prescriptive period extended for review legal deadline		6
Income Tax Penalty Paid	$ 3.8
Additional Income Tax Payable	$ 0.4
Mining Royalties Operation [Member]
Disclosure of Income tax and deferred taxes [Line Items]
Applicable tax rate		5.00%
Caliche Extraction Operation [Member]
Disclosure of Income tax and deferred taxes [Line Items]
Applicable tax rate		5.24%
United States
Disclosure of Income tax and deferred taxes [Line Items]
Prescriptive period for review legal deadline		3
Prescriptive period extended for review legal deadline		6
Mexico
Disclosure of Income tax and deferred taxes [Line Items]
Applicable tax rate		30.00%	30.00%
Prescriptive period for review legal deadline		5
Spain
Disclosure of Income tax and deferred taxes [Line Items]
Prescriptive period for review legal deadline		4
Belgium
Disclosure of Income tax and deferred taxes [Line Items]
Prescriptive period for review legal deadline		3
Prescriptive period extended for review legal deadline		5
South Africa
Disclosure of Income tax and deferred taxes [Line Items]
Applicable tax rate		28.00%	28.00%
Prescriptive period for review legal deadline		3
Prescriptive period extended for review legal deadline		5

X

- Definition

The applicable income tax rate.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2019-01-01
-Paragraph 81
-Subparagraph c
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_c_ii&doctype=Standard
-URIDate 2019-03-27

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of additional income tax.

+ References

No definition available.

+ Details

Name:	sqm_AdditionalIncomeTaxPayable
Namespace Prefix:	sqm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

The amount of income tax penalty paid.

+ References

No definition available.

+ Details

Name:	sqm_IncomeTaxPenaltyPaid
Namespace Prefix:	sqm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The prescriptive period which can be extended for review dating from the expiration of the legal deadline when payment should have been made.

+ References

No definition available.

+ Details

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

X

- Definition

The prescriptive period for review dating from the expiration of the legal deadline when payment should have been made.

+ References

No definition available.

+ Details

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

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=sqm_MiningRoyaltiesOperationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ProductsAndServicesAxis=sqm_CalicheExtractionOperationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=sqm_UnitedStatesOfAmericaCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=sqm_MexicoCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=sqm_SpainCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=sqm_BelgiumCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_GeographicalAreasAxis=sqm_SouthAfricaCountryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: