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Basis of presentation for the consolidated financial statements (Details Textual) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Disclosure of Basis of presentation for the consolidated financial statements [Abstract]
Adjustments Through IFRS	$ 2,301
Deferred Taxes	$ 1,680

X

- Definition

The adjustments to financial statements due to implementation of ifrs

+ References

No definition available.

+ Details

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

X

- Definition

The amount represents deferred taxes due to implementation of ifrs.

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No definition available.

+ Details

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

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- References

No definition available.

+ Details

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