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Effect of fluctuations in foreign currency exchange rates (Tables) | 12 Months Ended
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Dec. 31, 2020
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 and other comprehensive income:
Foreign currency exchange differences recognized in profit or loss and other comprehensive income |  | As of December 31, 2020 |  |  | As of December 31, 2019 |  |  | As of December 31, 2018 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Conversion foreign exchange gains (losses) recognized in the result of the year |  |  | (4,423 | ) |  |  | (2,169 | ) |  |  | (16,597 | )
Conversion foreign exchange reserves |  |  |  |  |  |  |  |  |  |  |  |
Conversion foreign exchange reserves attributable to the owners of the controlling entity |  |  | 14,176 |  |  |  | 562 |  |  |  | (1,394 | )
Conversion foreign exchange reserves attributable to the non-controlling entity |  |  | (176 | ) |  |  | 225 |  |  |  | 174 |
Total |  |  | 14,000 |  |  |  | 787 |  |  |  | (1,220 | )
Disclosure of reserve of exchange differences on translation [Text Block] |
| (b) | Reserves for foreign currency exchange differences:
As of December 31, 2020, and 2019, are detailed as follows:
Details |  | As of December 31, 2020 |  |  | As of December 31, 2019 |  |  | As of December 31, 2018 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Changes in equity generated by the equity method value through conversion: |  |  |  |  |  |  |  |  |  |  |  |
Comercial Hydro S.A. |  |  | 1,004 |  |  |  | 1,004 |  |  |  | 1,004 |
SQMC Internacional Ltda. |  |  | (9 | ) |  |  | (9 | ) |  |  | (17 | )
Proinsa Ltda. |  |  | (10 | ) |  |  | (10 | ) |  |  | (11 | )
Comercial Agrorama Ltda. |  |  | (19 | ) |  |  | 33 |  |  |  | (21 | )
Isapre Norte Grande Ltda. |  |  | (14 | ) |  |  | (44 | ) |  |  | (1 | )
Almacenes y Depósitos Ltda. |  |  | 211 |  |  |  | 142 |  |  |  | 113 |
Sacal S.A. |  |  | (3 | ) |  |  | (3 | ) |  |  | (3 | )
Sociedad Prestadora de Servicios de Salud Cruz del Norte S.A. |  |  | (13 | ) |  |  | (19 | ) |  |  | (10 | )
Agrorama S.A. |  |  | 92 |  |  |  | 231 |  |  |  | 132 |
Doktor Tarsa |  |  | - |  |  |  | (13,811 | ) |  |  | (13,811 | )
SQM Vitas Fzco |  |  | (3,736 | ) |  |  | (2,267 | ) |  |  | (2,682 | )
Ajay Europe |  |  | (693 | ) |  |  | (1,449 | ) |  |  | (1,270 | )
SQM Eastmed Turkey |  |  | - |  |  |  | (155 | ) |  |  | (113 | )
Doctochem |  |  | - |  |  |  | 7 |  |  |  | - |
Coromandel SQM India |  |  | - |  |  |  | (431 | ) |  |  | (393 | )
SQM Italia SRL |  |  | - |  |  |  | (236 | ) |  |  | (213 | )
SQM Oceanía Pty Ltd. |  |  | (579 | ) |  |  | (634 | ) |  |  | (634 | )
SQM Indonesia S.A. |  |  | (124 | ) |  |  | (124 | ) |  |  | (124 | )
Abu Dhabi Fertillizers Industries WWL. |  |  | 372 |  |  |  | 372 |  |  |  | (435 | )
SQM Vitas Holland |  |  | 99 |  |  |  | (197 | ) |  |  | (170 | )
SQM Thailand Limited |  |  | (68 | ) |  |  | (68 | ) |  |  | (68 | )
SQM Europe |  |  | (1,983 | ) |  |  | (1,983 | ) |  |  | (1,983 | )
SQM Australia Pty Ltd. |  |  | (4,052 | ) |  |  | (4,035 | ) |  |  | (4,222 | )
Pavoni & C. Spa |  |  | 164 |  |  |  | (185 | ) |  |  | 70 |
Terra Tarsa BV |  |  | - |  |  |  | 116 |  |  |  | (82 | )
Plantacote NV |  |  | - |  |  |  | (16 | ) |  |  | (34 | )
Doktolab Tarim Arastirma San. |  |  | - |  |  |  | (54 | ) |  |  | (29 | )
Kore Potash PLC (a) |  |  | (1,128 | ) |  |  | (1,754 | ) |  |  | (1,206 | )
SQM Colombia SAS |  |  | (80 | ) |  |  | (166 | ) |  |  | (94 | )
Total |  |  | (11,569 | ) |  |  | (25,745 | ) |  |  | (26,307 | )

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