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Financial instruments (Details 6) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Financial instruments [Line Items] |  |  |
Effect on profit or loss for the period Derivative instruments | $ 0 | $ 0 | $ (229)
Debt [Member] | Cross currency swap contracts [Member] |  |  |
Financial instruments [Line Items] |  |  |
Derivative instruments | (17,318) | 17,128 |
Effect on profit or loss for the period Derivative instruments | 16,636 | 33,696 |
Hedging reserve in equity before tax | 1,541 | 41 |
Deferred tax hedging reserve in equity | 0 | 0 |
Hedging reserve in equity | 1,541 | 41 |
Debt [Member] | Forward contract [member] |  |  |
Financial instruments [Line Items] |  |  |
Derivative instruments | 13,516 | 8,910 |
Effect on profit or loss for the period Derivative instruments | (3,004) | 5,641 |
Hedging reserve in equity before tax | 8,256 | 2,170 |
Deferred tax hedging reserve in equity | 0 | 0 |
Hedging reserve in equity | 8,256 | 2,170 |
Investments [Member] | Cross currency swap contracts [Member] |  |  |
Financial instruments [Line Items] |  |  |
Derivative instruments | 18,146 | (20,159) |
Effect on profit or loss for the period Derivative instruments | 19,911 | (20,256) |
Hedging reserve in equity before tax | (1,765) | 97 |
Deferred tax hedging reserve in equity | 0 | 0 |
Hedging reserve in equity | $ (1,765) | $ 97 |

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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 2021-01-01 -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_24_a_i&doctype=Standard&book=b -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24A_a&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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

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

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |