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Income tax and deferred taxes (Details Textual) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Income tax and deferred taxes [Line Items] |  |  |
Applicable tax rate | 27.00% | 27.00% | 27.00%
Prescriptive period for review legal deadline | 3 |  |
Prescriptive period extended for review legal deadline | 6 |  |
Current tax expenses recognised | $ 1,901 | $ (12,222) | $ (1,577)
Mining Royalties Operation [Member] |  |  |
Disclosure of Income tax and deferred taxes [Line Items] |  |  |
Applicable tax rate | 5.00% |  |
Caliche Extraction Operation [Member] |  |  |
Disclosure of Income tax and deferred taxes [Line Items] |  |  |
Applicable tax rate | 5.38% |  |
United States |  |  |
Disclosure of Income tax and deferred taxes [Line Items] |  |  |
Prescriptive period for review legal deadline | 3 |  |
Prescriptive period extended for review legal deadline | 6 |  |
Mexico |  |  |
Disclosure of Income tax and deferred taxes [Line Items] |  |  |
Applicable tax rate | 30.00% | 30.00% |
Prescriptive period for review legal deadline | 5 |  |
Spain |  |  |
Disclosure of Income tax and deferred taxes [Line Items] |  |  |
Prescriptive period for review legal deadline | 4 |  |
Belgium |  |  |
Disclosure of Income tax and deferred taxes [Line Items] |  |  |
Prescriptive period for review legal deadline | 3 |  |
Prescriptive period extended for review legal deadline | 5 |  |
South Africa |  |  |
Disclosure of Income tax and deferred taxes [Line Items] |  |  |
Applicable tax rate | 28.00% | 28.00% |
Prescriptive period for review legal deadline | 3 |  |
Prescriptive period extended for review legal deadline | 5 |  |
Belgium | SQM Europe N.V. [Member] | Year 2017 [Member] | Difference due to transfer pricing [Member] |  |  |
Disclosure of Income tax and deferred taxes [Line Items] |  |  |
Current tax expenses recognised |  | $ 1,068 |

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- Definition Adjustments of tax expense (income) recognised in the period for current tax of prior periods. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 80 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_80_b&doctype=Standard -URIDate 2020-01-01 + Details
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