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Financial instruments (Details 12) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jan. 15, 2018
Financial instruments [Line Items] |  |  |
Tax ID No. | Total | Foreign |
Company |  | SQM S.A. |
Financial institution |  | Scotiabank Cayman |
Effective rate |  |  | 3.25%
Notional amounts | $ 148,728 | $ 16,796 |
Current amounts | 199 |  |
Borrowing costs | 0 | (1,651) |
Total | 199 |  |
Not later than three months [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 |  |
Current amounts | 12 |  |
Later than three months and not later than one year [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 |  |
Current amounts | $ 187 |  |
Bank borrowings [Member] |  |  |
Financial instruments [Line Items] |  |  |
Current amounts |  | 300 |
Borrowing costs |  | 0 |
Total |  | 300 |
Bank borrowings [Member] | Not later than three months [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts |  | 52 |
Bank borrowings [Member] | Later than three months and not later than one year [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts |  | 248 |
Bank borrowing One [Member] |  |  |
Financial instruments [Line Items] |  |  |
Tax ID No. | 93.007.000-9 |  |
Company | SQM S.A. |  |
Country | Chile |  |
Tax ID No. | Foreign |  |
Financial institution | Scotiabank Cayman |  |
Country | USA |  |
Currency or adjustment index | US$ |  |
Repayment | Upon maturity |  |
Borrowings Expiration Date | May 29, 2023 |  |
Effective rate | 2.11% |  |
Nominal rate | 3.01% |  |
Current amounts |  | 248 |
Borrowing costs |  | 0 |
Total |  | 248 |
Bank borrowing One [Member] | Not later than three months [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts |  | 0 |
Bank borrowing One [Member] | Later than three months and not later than one year [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts |  | $ 248 |
Bank borrowing Two [Member] |  |  |
Financial instruments [Line Items] |  |  |
Company |  | Nitratos Naturais do Chile Lim |
Financial institution |  | Banco ITAU Brasil |
Current amounts |  | $ 11 |
Borrowing costs |  | 0 |
Total |  | 11 |
Bank borrowing Two [Member] | Not later than three months [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts |  | 11 |
Bank borrowing Two [Member] | Later than three months and not later than one year [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts |  | $ 0 |
Bank borrowing Three [Member] |  |  |
Financial instruments [Line Items] |  |  |
Tax ID No. | SQM S.A. | 93.007.000-9 |
Company |  | SQM Brasil Limitada |
Country |  | Chile |
Tax ID No. |  | Foreign |
Financial institution | Scotiabank Cayman | Banco ITAU Brasil |
Country |  | USA |
Currency or adjustment index |  | US$ |
Repayment |  | Upon maturity |
Borrowings Expiration Date |  | May 29, 2023 |
Effective rate |  | 3.60% |
Nominal rate |  | 3.98% |
Notional amounts | $ 0 |  |
Current amounts | 187 | $ 41 |
Borrowing costs | 0 | 0 |
Total | 187 | 41 |
Bank borrowing Three [Member] | Not later than three months [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | 41 |
Current amounts | 0 |  |
Bank borrowing Three [Member] | Later than three months and not later than one year [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 | $ 0 |
Current amounts | $ 187 |  |
Foreign Bank Borrowings One [Member] |  |  |
Financial instruments [Line Items] |  |  |
Tax ID No. | Nitratos Naturais do Chile | Foreign |
Company | Nitratos Naturais do Chile Lim. | Nitratos Naturais do Chile Lim |
Country | Brazil | Brazil |
Tax ID No. | Foreign | Foreign |
Financial institution | Banco Itau Brasil | Banco ITAU Brasil |
Country | Brazil | Brazil |
Currency or adjustment index | BRL | BRL |
Repayment | Upon maturity | Upon maturity |
Borrowings Expiration Date | Dec. 31, 2019 | Jan. 31, 2019 |
Effective rate | 13.57% | 5.17% |
Nominal rate | 4.25% | 5.17% |
Notional amounts | $ 0 |  |
Current amounts | 12 |  |
Borrowing costs | 0 |  |
Total | 12 |  |
Foreign Bank Borrowings One [Member] | Not later than three months [member] |  |  |
Financial instruments [Line Items] |  |  |
Notional amounts | 0 |  |
Current amounts | $ 12 |  |
Foreign Bank Borrowings Two [Member] |  |  |
Financial instruments [Line Items] |  |  |
Tax ID No. |  | Foreign |
Company |  | SQM Brasil Limitada |
Country |  | Brazil |
Tax ID No. |  | Foreign |
Financial institution |  | Banco ITAU Brasil |
Country |  | Brazil |
Currency or adjustment index |  | BRL |
Repayment |  | Upon maturity |
Borrowings Expiration Date |  | Jan. 31, 2019 |
Effective rate |  | 5.50% |
Nominal rate |  | 5.50% |

X
- Definition The amount of interest and other costs that an entity incurs in connection with the borrowing of funds. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The currency in which the borrowings are denominated. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The country in which the entity is incorporated. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 138 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_138_a&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of current borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard -URIDate 2019-03-27 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | instant

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- Definition The date of expiration of bank borrowings. + References No definition available. + Details
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Namespace Prefix: | sqm_
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Balance Type: | na
Period Type: | duration

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- Definition The nominal interest rate on borrowings. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition The country in which creditor institution is incorporated. + References No definition available. + Details
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Balance Type: | na
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- Definition The description of tax id number of the creditor institutions. + References No definition available. + Details
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Balance Type: | na
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- Definition The description about repayment of borrowings. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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- Definition The name of creditor institution. + References No definition available. + Details
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Namespace Prefix: | sqm_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of short term borrowings after deducting borrowing costs. + 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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