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Other current and non-current non-financial assets (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of other non-financials asset [Abstract] |  |
Opening balance | $ 23,008 | $ 31,911
Changes |  |
Additions, other than business combinations | 0 | 0
Depreciation and amortization | (5,440) | (9,498)
Increase (decrease) due to transfers and other charges | 153 | 595
Total changes | (5,287) | (8,903)
Total | $ 17,721 | $ 23,008

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 amount of depreciation and amortization recognised on exploration and mineral resource. + References No definition available. + Details
Name: | sqm_DepreciationAndAmortizationExplorationAndMineralResource
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