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Effect of fluctuations in foreign currency exchange rates (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of effect of changes in foreign exchange rates [Abstract] |
Disclosure of foreign currency exchange differences recognized in profit or loss except for financial instruments measured at fair value through profit or loss [Text Block] |
| a) | Foreign currency exchange differences recognized in profit or loss except for financial instruments measured at fair value through profit or loss:
|  | 12/31/2017 ThUS$ |  | 12/31/2016 ThUS$ |  | 12/31/2015 ThUS$ |
Conversion foreign exchange gains (losses) recognized in the result of the year. |  |  | (1,299) |  |  | 460 |  |  | (12,364) |
Conversion foreign exchange reserves attributable to the owners of the controlling entity |  |  | (5,450) |  |  | (5,428) |  |  | (6,334) |
Conversion foreign exchange reserves attributable to the non-controlling entity |  |  | 4 |  |  | 35 |  |  | (165) |
Disclosure of reserve of exchange differences on translation [Text Block] | As of December 31, 2017, , 2016 and 2015, foreign currency exchange differences are detailed as follows:
Detail |  | 12/31/2017 ThUS$ |  | 12/31/2016 ThUS$ |  | 12/31/2015 ThUS$ |
Changes in equity generated by conversion of equity value: |  |  |  |  |  |  |  |  |  |
Comercial Hydro S.A. |  |  | 1,004 |  |  | 1,004 |  |  | 1,004 |
SQMC Internacional Ltda. |  |  | (2) |  |  | (13) |  |  | (20) |
Proinsa Ltda. |  |  | (7) |  |  | (10) |  |  | (15) |
Comercial Agrorama Ltda. |  |  | (44) |  |  | (69) |  |  | (100) |
Isapre Norte Grande Ltda. |  |  | (74) |  |  | (124) |  |  | (155) |
Almacenes y Depósitos Ltda. |  |  | 97 |  |  | 47 |  |  | (31) |
Sales de Magnesio Ltda. |  |  | - |  |  | (29) |  |  | (161) |
Sociedad Prestadora de Servicios de Salud Cruz del Norte S.A. |  |  | - |  |  | (6) |  |  | (9) |
Agrorama S.A. |  |  | (98) |  |  | (49) |  |  | (35) |
Doktor Tarsa |  |  | (14,447) |  |  | (12,264) |  |  | (8,305) |
SQM Vitas Fzco |  |  | (1,779) |  |  | (1,801) |  |  | (2,245) |
Ajay Europe |  |  | (831) |  |  | (1,935) |  |  | (1,731) |
SQM Eastmed Turkey |  |  | (92) |  |  | (95) |  |  | (81) |
Charlee SQM (Thailand) Co. Ltd. |  |  | (285) |  |  | (460) |  |  | (476) |
Coromandel SQM India |  |  | (234) |  |  | (282) |  |  | (301) |
SQM Italia SRL |  |  | (154) |  |  | (287) |  |  | (250) |
SQM Oceania Pty Ltd. |  |  | (634) |  |  | (634) |  |  | (634) |
SQM Indonesia S.A. |  |  | (124) |  |  | (124) |  |  | (123) |
Abu Dhabi Fertilizers Industries WWL. |  |  | (435) |  |  | (434) |  |  | 21 |
SQM Vitas Holland |  |  | (101) |  |  | (280) |  |  | (320) |
SQM Thailand Limited |  |  | (68) |  |  | (68) |  |  | (68) |
SQM Europe N.V. |  |  | (1,550) |  |  | (1,550) |  |  | - |
Minera Exar S.A. |  |  | (5,209) |  |  | - |  |  | - |
SQM Australia Pty Ltd. |  |  | 154 |  |  | - |  |  | - |
Total |  |  | (24,913) |  |  | (19,463) |  |  | 14,035 |

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