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Contingencies and restrictions (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of contingent liability [Abstract] |
Disclosure of detailed information about financial indicators [Text Block] | As of December 31, 2017, the aforementioned financial indicators are as follows:
Indicator |  | 12/31/2017 |  | 12/31/2016 |
Equity ThUS$ |  | 2,247,468 |  | 2,307,272 |
Net Financial Debt/ EBITDA |  | 0.27 |  | 0.58 |
Indebtedness |  | 0.91 |  | 0.83 |
SQM Industrial and SQM Salar debt / Current assets |  | 0.03 |  | 0.02 |
Disclosure of detailed information about grantor obligations [Text Block] |
Grantor |  | Relationship |  |  | 12/31/2017 |  |  | 12/31/2016 |
|  |  |  |  | ThUS$ |  |  | ThUS$ |
Ferosor Agrícola S.A. |  | Unrelated third party |  |  | 4,067 |  |  | - |
Tattersall Agroinsumos S.A. |  | Unrelated third party |  |  | 2,000 |  |  | 2,000 |
Contador Frutos S.A. |  | Unrelated third party |  |  | 1,743 |  |  | 1,574 |
Agrícola Lobert Ltda. |  | Unrelated third party |  |  | 1,264 |  |  | 1,141 |
Covepa SPA |  | Unrelated third party |  |  | 813 |  |  | 747 |
Johannes Epple Davanzo |  | Unrelated third party |  |  | 363 |  |  | 333 |
Hortofrutícola La Serena |  | Unrelated third party |  |  | 323 |  |  | 291 |
Juan Luis Gaete Chesta |  | Unrelated third party |  |  | 262 |  |  | 241 |
Arena Fertilizantes y Semillas |  | Unrelated third party |  |  | 244 |  |  | 224 |
Vicente Oyarce Castro |  | Unrelated third party |  |  | 244 |  |  | 220 |
Soc. Agrocom. Julio Polanco |  | Unrelated third party |  |  | 163 |  |  | 149 |
Bernardo Guzmán Schmidt |  | Unrelated third party |  |  | 138 |  |  | 125 |
Gilberto Rivas Y Cia. Ltda. |  | Unrelated third party |  |  | 138 |  |  | 125 |
Lemp Martin Julian |  | Unrelated third party |  |  | 124 |  |  | 111 |
Comercial Agrosal Ltda. |  | Unrelated third party |  |  | 116 |  |  | 105 |
Soc. Comercial el Mimbral |  | Unrelated third party |  |  | 101 |  |  | - |
Total |  |  |  |  | 12,103 |  |  | 7,386 |
Disclosure of detailed information about guarantees in which there is no pending balance [Text Block] | The bonds which disclose a balance as of December 31, 2017 and December 31, 2016 are detailed below:
Creditor of the guarantee |  | Debtor |  | Type of guarantee |  | Balances as of the closing date of the financial statements |
|  | Name |  | Relationship |  |  |  | 12/31/2017 ThUS$ |  | 12/31/2016 ThUS$ |
Australian and New Zealand Bank |  | SQM North America Corp |  | Subsidiary |  | Bond |  | - |  | - |
Australian and New Zealand Bank |  | SQM Europe N.V. |  | Subsidiary |  | Bond |  | - |  | - |
Generale Bank |  | SQM North America Corp |  | Subsidiary |  | Bond |  | - |  | - |
Generale Bank |  | SQM Europe N.V. |  | Subsidiary |  | Bond |  | - |  | - |
Kredietbank |  | SQM North America Corp |  | Subsidiary |  | Bond |  | - |  | - |
Kredietbank |  | SQM Europe N.V. |  | Subsidiary |  | Bond |  | - |  | - |
Banks and financial institutions |  | SQM Investment Corp. N.V. |  | Subsidiary |  | Bond |  | - |  | - |
Banks and financial institutions |  | SQM Europe N.V. |  | Subsidiary |  | Bond |  | - |  | - |
Banks and financial institutions |  | SQM North America Corp |  | Subsidiary |  | Bond |  | - |  | - |
Banks and financial institutions |  | Nitratos Naturais do Chile Ltda. |  | Subsidiary |  | Bond |  | - |  | - |
Banks and financial institutions |  | SQM México S.A. de C.V. |  | Subsidiary |  | Bond |  | - |  | - |
Banks and financial institutions |  | SQM Brasil Ltda. |  | Subsidiary |  | Bond |  | - |  | - |
“BNP” |  | SQM Investment Corp. N.V. |  | Subsidiary |  | Bond |  | - |  | - |
Sociedad Nacional de Mineria A.G. |  | SQM Potasio S.A. |  | Subsidiary |  | Bond |  | - |  | - |
Scotiabank &; Trust (Cayman) Ltd. |  | Royal Seed Trading A.V.V. |  | Subsidiary |  | Bond |  | - |  | - |
Scotiabank &; Trust (Cayman) Ltd. |  | Royal Seed Trading A.V.V. |  | Subsidiary |  | Bond |  | - |  | - |
Bank of America |  | Royal Seed Trading A.V.V. |  | Subsidiary |  | Bond |  | - |  | - |
Export Development Canada |  | Royal Seed Trading A.V.V. |  | Subsidiary |  | Bond |  | - |  | - |
The Bank of Tokyo-Mitsubishi UFJ Ltd. |  | Royal Seed Trading A.V.V. |  | Subsidiary |  | Bond |  | - |  | - |
JP Morgan Chase Bank |  | SQM Industrial S.A. |  | Subsidiary |  | Bond |  | - |  | - |
The Bank of Nova Scotia |  | SQM Investment Corp. N.V. |  | Subsidiary |  | Bond |  | - |  | - |
Creditor of the guarantee |  | Debtor |  | Type of guarantee |  | Pending balances as of the closing date of the financial statements |
|  | Name |  | Relationship |  |  |  | 12/31/2017 ThUS$ |  | 12/31/2016 ThUS$ |
Credit Suisse International |  | SQM Investment Corp. N.V. |  | Subsidiary |  | Bond |  | - |  | - |
Morgan Stanley Capital Services |  | SQM Investment Corp. N.V. |  | Subsidiary |  | Bond |  | - |  | - |
The Bank of Tokyo-Mitsubishi UFJ Ltd. |  | SQM Investment Corp. N.V. |  | Subsidiary |  | Bond |  | - |  | - |
HSBC |  | SQM Investment Corp. N.V. |  | Subsidiary |  | Bond |  | - |  | - |
Deutsche Bank AG |  | SQM Investment Corp. N.V. |  | Subsidiary |  | Bond |  | - |  | - |

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