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Inventories (Details 1) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Inventories [Abstract] |  |  |  |
Raw material reserves | $ 2,488 | $ 1,838 |  |
Products-in-progress reserves | 71,468 | 82,673 |  |
Finished product reserves | 14,218 | 20,771 |  |
Total | $ 88,174 | $ 105,282 | $ 96,284 | $ 81,295

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- Definition The amount of reserves relating to finished goods. + References No definition available. + Details
Name: | sqm_FinishedGoodsReserves
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | sqm_InventoriesAbstract
Namespace Prefix: | sqm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of inventory reserves recognized. + References No definition available. + Details
Name: | sqm_InventoryReserves
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of reserves relating to raw materials. + References No definition available. + Details
Name: | sqm_RawMaterialReserves
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of reserves relating to work in progress. + References No definition available. + Details
Name: | sqm_WorkInProgressReserves
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant