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Financial instruments (Details 33) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financial instruments [Line Items] |  |  |
Current and non-current lease liabilities, beginning of year | $ 0 |  |
Adoption of IFRS 16 | 45,115 |  |
Monetary Principal 1 paid | (7,221) | $ 0 | $ 0
Monetary Interest paid | (1,537) |  |
Non- Monetary Interest accrued | 1,535 |  |
Current and non-current lease liabilities, ending of year | 37,897 | 0 |
Buildings [Member] |  |  |
Financial instruments [Line Items] |  |  |
Current and non-current lease liabilities, beginning of year | 0 |  |
Adoption of IFRS 16 | 29,289 |  |
Monetary Principal 1 paid | (3,101) |  |
Monetary Interest paid | (840) |  |
Non- Monetary Interest accrued | 838 |  |
Current and non-current lease liabilities, ending of year | 26,186 | 0 |
Transport equipment [Member] |  |  |
Financial instruments [Line Items] |  |  |
Current and non-current lease liabilities, beginning of year | 0 |  |
Adoption of IFRS 16 | 3,893 |  |
Monetary Principal 1 paid | (515) |  |
Monetary Interest paid | (62) |  |
Non- Monetary Interest accrued | 66 |  |
Current and non-current lease liabilities, ending of year | 3,382 | 0 |
Machinery [member] |  |  |
Financial instruments [Line Items] |  |  |
Current and non-current lease liabilities, beginning of year | 0 |  |
Adoption of IFRS 16 | 11,933 |  |
Monetary Principal 1 paid | (3,605) |  |
Monetary Interest paid | (635) |  |
Non- Monetary Interest accrued | 636 |  |
Current and non-current lease liabilities, ending of year | $ 8,329 | $ 0 |

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- Definition The amount of interest expense on lease liabilities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_b&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_InterestExpenseOnLeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
Name: | ifrs-full_LeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The cash outflow for payment of lease liabilities, classified as financing activities. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 17 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_17_e&doctype=Standard -URIDate 2019-03-27 + Details
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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_FinancialInstrumentsLineItems
Namespace Prefix: | sqm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase decrease from adoption of new standard. + References No definition available. + Details
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Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Payments of interest on leases. + References No definition available. + Details
Name: | sqm_PaymentsOfInterestOnLeases
Namespace Prefix: | sqm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_VehiclesMember
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: |