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Background of companies included in consolidation (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Background of companies included in consolidation [Line Items] |  |  |
Profit (loss) attributable to non-controlling interests | $ 733 | $ 3,641 | $ 3,952
Equity, non-controlling interests | 59,647 | 61,198 |
Dividends paid to non- controlling interests | $ 2,253 | 3,014 |
Proinsa Ltda. [Member] |  |  |
Background of companies included in consolidation [Line Items] |  |  |
% of interests in the ownership held by non- controlling interests. | 0.10% |  |
Profit (loss) attributable to non-controlling interests | $ 0 | 0 |
Equity, non-controlling interests | 0 | 0 |
Dividends paid to non- controlling interests | $ 0 | 0 |
SQM Potasio S.A. [Member] |  |  |
Background of companies included in consolidation [Line Items] |  |  |
% of interests in the ownership held by non- controlling interests. | 0.00% |  |
Profit (loss) attributable to non-controlling interests | $ 0 | 0 |
Equity, non-controlling interests | 0 | 0 |
Dividends paid to non- controlling interests | $ 0 | 0 |
Ajay SQM Chile S.A. [Member] |  |  |
Background of companies included in consolidation [Line Items] |  |  |
% of interests in the ownership held by non- controlling interests. | 49.00% |  |
Profit (loss) attributable to non-controlling interests | $ (1,023) | 1,360 |
Equity, non-controlling interests | 8,307 | 8,303 |
Dividends paid to non- controlling interests | $ 989 | 1,163 |
SQM Indonesia S.A. [Member] |  |  |
Background of companies included in consolidation [Line Items] |  |  |
% of interests in the ownership held by non- controlling interests. | 20.00% |  |
Profit (loss) attributable to non-controlling interests | $ 0 | 0 |
Equity, non-controlling interests | 1 | 1 |
Dividends paid to non- controlling interests | $ 0 | 0 |
Soquimich Comercial S.A. [Member] |  |  |
Background of companies included in consolidation [Line Items] |  |  |
% of interests in the ownership held by non- controlling interests. | 39.36168% |  |
Profit (loss) attributable to non-controlling interests | $ (100) | 2,378 |
Equity, non-controlling interests | 49,247 | 50,416 |
Dividends paid to non- controlling interests | $ 1,264 | 1,851 |
Comercial Agrorama Ltda. [Member] |  |  |
Background of companies included in consolidation [Line Items] |  |  |
% of interests in the ownership held by non- controlling interests. | 30.00% |  |
Profit (loss) attributable to non-controlling interests | $ 403 | (106) |
Equity, non-controlling interests | (184) | 201 |
Dividends paid to non- controlling interests | $ 0 | 0 |
Agrorama S.A. [Member] |  |  |
Background of companies included in consolidation [Line Items] |  |  |
% of interests in the ownership held by non- controlling interests. | 0.001% |  |
Profit (loss) attributable to non-controlling interests | $ 0 | 0 |
Equity, non-controlling interests | 0 | 0 |
Dividends paid to non- controlling interests | $ 0 | 0 |
Orcoma Estudios SPA [Member] |  |  |
Background of companies included in consolidation [Line Items] |  |  |
% of interests in the ownership held by non- controlling interests. | 49.00% |  |
Profit (loss) attributable to non-controlling interests | $ 0 | 2 |
Equity, non-controlling interests | 2,277 | 2,277 |
Dividends paid to non- controlling interests | $ 0 | 0 |
SQM (Thailand) Limited. [Member] |  |  |
Background of companies included in consolidation [Line Items] |  |  |
% of interests in the ownership held by non- controlling interests. | 0.004% |  |
Profit (loss) attributable to non-controlling interests | $ 0 | 0 |
Equity, non-controlling interests | 0 | 0 |
Dividends paid to non- controlling interests | $ 0 | $ 0 |

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