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Inventories(Details 1) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Inventories [Line Items] |  |  |  |
Raw material reserves | $ 93 | $ 93 | $ 93 |
Suministros para la producción | 0 | 920 | 920 |
Products-in-progress reserves | 80,249 | 50,925 | 53,187 |
Finished product reserves | 15,942 | 29,357 | 26,169 |
Total | $ 96,284 | $ 81,295 | $ 80,369 | $ 82,966

X
- 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

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

X
- 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

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

X
- 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