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Financial instruments - Hedging Effect in Profit and Equity (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Financial instruments [Abstract] |  |
Effect on Profit or Loss | $ 25,714 | $ (17,761)
Hedge Reserves from Variation in Gross Hedges | $ (19,967) | $ (46,529)

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- Definition The gains (losses) on hedging instruments in fair value hedges. [Refer: Fair value hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2022-03-24 -Paragraph 24 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_24_a_i&doctype=Standard&book=b -URIDate 2022-03-24 + Details
Name: | ifrs-full_GainsLossesOnHedgingInstrument
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition A component of gross equity representing the hedging reserve. + References No definition available. + Details
Name: | sqm_HedgingReserveInEquityBeforeTax
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant