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Disclosures on equity (Details 4) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Disclosure of Disclosures on equity [Line Items] |  |  |  |
Equity before adjustments | $ 13,009 | $ 9,509 | $ 9,509 |
Adjustments to equity | (1,677) | (1,677) | (1,677) |
Equity | 2,247,468 | 2,307,272 | 2,400,356 | $ 2,292,515
SQM Iberian S.A. [Member] |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |
Equity before adjustments | 9,464 | 5,964 | 5,963 |
SQM Europe N.V. [Member] |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |
Equity before adjustments | 1,957 | 1,957 | 1,958 |
Soquimich European Holding B.V. [Member] |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |
Equity before adjustments | 828 | 828 | 828 |
Abu Dhabi Fertilizer Industries WWL [Member] |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |
Equity before adjustments | 455 | 455 | 455 |
Doktor Tarsa Tarim Sanayi AS [Member] |  |  |  |
Disclosure of Disclosures on equity [Line Items] |  |  |  |
Equity before adjustments | $ 305 | $ 305 | $ 305 |

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