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Effect of fluctuations in foreign currency exchange rates (Tables) | 12 Months Ended
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Dec. 31, 2019
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:
Exchange rate differences recognized in income and other comprehensive incom e |  | As of December ‎ 31, 2019 |  |  | As of December ‎ 31, 2018 |  |  | As of December ‎ 31, 2017 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Conversion foreign exchange gains (losses) recognized in the result of the year. |  |  | (2,169 | ) |  |  | (16,597 | ) |  |  | (1,299 | )
Reserves for translation differences |  |  |  |  |  |  |  |  |  |  |  |
Conversion foreign exchange reserves attributable to the owners of the controlling entity. |  |  | 562 |  |  |  | (1,394 | ) |  |  | (5,450 | )
Conversion foreign exchange reserves attributable to the non-controlling entity. |  |  | 226 |  |  |  | 174 |  |  |  | 4 |
Total |  |  | 788 |  |  |  | (1,220 | ) |  |  | (5,446 | )
Disclosure of reserve of exchange differences on translation [Text Block] |
| b) | Reserves for foreign currency exchange differences, Equity:
As of December 31, 2019, 2018 and 2017, foreign currency exchange differences are detailed as follows:
Detail |  | As of December ‎ 31, 2019 |  |  | As of December ‎ 31, 2018 |  |  | As of December ‎ 31, 2017 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |
Changes in equity generated by conversion of equity value: |  |  |  |  |  |  |  |  |  |  |  |
Comercial Hydro S.A. |  |  | 1,004 |  |  |  | 1,004 |  |  |  | 1,004 |
SQMC Internacional Ltda. |  |  | (9 | ) |  |  | (17 | ) |  |  | (2 | )
Proinsa Ltda. |  |  | (10 | ) |  |  | (11 | ) |  |  | (7 | )
Comercial Agrorama Ltda. |  |  | 33 |  |  |  | (21 | ) |  |  | (44 | )
Isapre Norte Grande Ltda. |  |  | (44 | ) |  |  | (1 | ) |  |  | (74 | )
Almacenes y Depósitos Ltda. |  |  | 142 |  |  |  | 113 |  |  |  | 97 |
Sacal S.A. |  |  | (3 | ) |  |  | (3 | ) |  |  | - |
Sociedad prestadora de servicios de Salud Cruz del Norte S.A. |  |  | (19 | ) |  |  | (10 | ) |  |  | - |
Agrorama S.A. |  |  | 231 |  |  |  | 132 |  |  |  | (98 | )
Doktor Tarsa Tarim Sanayi AS |  |  | (13,811 | ) |  |  | (13,811 | ) |  |  | (14,447 | )
SQM Vitas Fzco. |  |  | (2,267 | ) |  |  | (2,682 | ) |  |  | (1,779 | )
Ajay Europe S.A.R.L |  |  | (1,449 | ) |  |  | (1,270 | ) |  |  |  |
SQM Eastmed Turkey |  |  | (155 | ) |  |  | (113 | ) |  |  | (92 | )
Doctochem Tarim Sanayi LTD |  |  | 7 |  |  |  | - |  |  |  | - |
Coromandel SQM India |  |  | (431 | ) |  |  | (393 | ) |  |  | (234 | )
SQM Italia SRL |  |  | (236 | ) |  |  | (213 | ) |  |  | (154 | )
SQM Oceanía Pty Ltd. |  |  | (634 | ) |  |  | (634 | ) |  |  | (634 | )
SQM Indonesia S.A. |  |  | (124 | ) |  |  | (124 | ) |  |  | (124 | )
Abu Dhabi Fertillizers Industries WWL. |  |  | 372 |  |  |  | (435 | ) |  |  | (435 | )
SQM Vitas Holland |  |  | (197 | ) |  |  | (170 | ) |  |  | (101 | )
SQM Thailand Limited |  |  | (68 | ) |  |  | (68 | ) |  |  | (68 | )
SQM Europe N.V. |  |  | (1,983 | ) |  |  | (1,983 | ) |  |  | (1,550 | )
SQM Australia Pty Ltd. |  |  | (4,035 | ) |  |  | (4,222 | ) |  |  | 154 |
Pavoni & C. Spa |  |  | (185 | ) |  |  | 70 |  |  |  | - |
Terra Tarsa BV |  |  | 116 |  |  |  | (82 | ) |  |  | - |
Plantacote NV |  |  | (16 | ) |  |  | (34 | ) |  |  | - |
Doktolab Tarim Arastirma San. |  |  | (54 | ) |  |  | (29 | ) |  |  | - |
Kore Potash PLC (a) |  |  | (1,754 | ) |  |  | (1,206 | ) |  |  | - |
SQM Colombia SAS |  |  | (166 | ) |  |  | (94 | ) |  |  | - |
Minera Exar S.A. |  |  | - |  |  |  | - |  |  |  | (5,209 | )
Charlee SQM (Thailand) Co. Ltd. |  |  | - |  |  |  | - |  |  |  | (285 | )
Ajay Europe S.A.R.L. |  |  | - |  |  |  | - |  |  |  | (831 | )
Total |  |  | (25,745 | ) |  |  | (26,307 | ) |  |  | (24,913 | )

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