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Assets held for sale (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Non-current assets or disposal groups classified as held for sale or as held for distribution to owners [abstract]
Terrenos Soquimich Comercial S.A.	$ 1,430	$ 1,480
Facilities and fixtures at Soquimich Comercial S.A.	0	109
Total assets held for sale	$ 1,430	$ 1,589

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- References

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Balance Type:	na
Period Type:	duration

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- Definition

The value of assets available for sale as of balance sheet.

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Namespace Prefix:	sqm_
Data Type:	xbrli:monetaryItemType
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- Definition

The value of facilities and fixtures available for sale as of balance sheet.

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

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- Definition

Carrying value of land held for sale.

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No definition available.

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