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Other current and non-current non-financial assets (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of other non-financials asset [Abstract]
Opening balance	$ 17,721	$ 23,008
Changes
Additions, other than business combinations	11,298	0
Reclassifications	1,987	595
Increase (decrease) due to transfers and other charges	(4,817)	(5,882)
Total changes	8,468	(5,287)
Total	$ 26,189	$ 17,721

X

- Definition

The amount of additions to exploration and mineral resource, other than those acquired through business combinations.

+ References

No definition available.

+ Details

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

X

- Definition

The disclosure of other non-financials asset

+ References

No definition available.

+ Details

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

X

- Definition

The increase (decrease) in exploration and mineral resource resulting from changes that the entity does not separately disclose in the same statement or note.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

Total increase (decrease) in prepaid stain development expenses and prospecting expenses.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of prepaid stain development expenses and prospecting expenses.

+ References

No definition available.

+ Details

Name:	sqm_PrepaidStainDevelopmentExpensesAndProspectingExpenses
Namespace Prefix:	sqm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of prepaid stain development expenses and prospecting expenses.

+ References

No definition available.

+ Details

Name:	sqm_PrepaidStainDevelopmentExpensesAndProspectingsExpense
Namespace Prefix:	sqm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The amount of reclassifications to exploration and mineral resource

+ References

No definition available.

+ Details

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