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Joint Ventures (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Joint Ventures Explanatory [Abstract] |
Disclosure of detailed information about investments in joint ventures [Text Block] | Investment in joint ventures accounted for under the equity method of accounting
|  |  |  |  |  | Country of |  | Share of interest |  | Dividends received |
Joint venture |  | Description of the nature of the relationship |  | Domicile |  | incorporation |  | in ownership |  | 12/31/2017 |  | 12/31/2016 |
|  |  |  |  |  |  |  |  |  | ThUS$ |  | ThUS$ |
Sichuan SQM Migao Chemical Fertilizers Co. Ltda. |  | Production and distribution of soluble fertilizers. |  | Huangjing Road, Dawan Town, Qingbaijiang District, Chengdu Municipality, Sichuan Province |  | China |  | 50 | % | - |  | - |
Coromandel SQM India |  | Production and distribution of potassium nitrate. |  | 1-2-10, Sardar Patel Road, Secunderabad – 500003 Andhra Pradesh |  | India |  | 50 | % | - |  | - |
SQM Vitas Fzco. |  | Production and commercialization of specialty plant and animal nutrition and industrial hygiene. |  | Jebel ALI Free Zone P.O. Box 18222, Dubai |  | United Arab Emirates |  | 50 | % | - |  | - |
SQM Star Qingdao Corp Nutrition. Co. Ltd. |  | Production and distribution of nutrient plant solutions with specialties NPK soluble |  | Longquan Town, Jimo City, Qingdao Municipality, Shangdong Province |  | China |  | 50 | % | - |  | - |
SQM Vitas Holland B.V (1) |  | Without information |  | Herikerbergweg 238, 1101 CM Amsterdam Zuidoost |  | Holland |  | 50 | % | - |  | - |
Minera Exar S.A. |  | Exploration and exploitation of minerals, processing and trading of such minerals |  | Dr. Sabín 1082 Ciudad de Nieva – San Salvador de Jujuy- Jujuy- República Argentina |  | Argentina |  | 50 | % | - |  | - |
| (1) | During May 2016, SQM Vitas Holland B.V. sold its interest in SQM Vitas Spain, to SQM Iberian S.A. resulting in the latter obtaining 100% in this transaction generating a loss of ThUS$ 104.
The companies described in the following table are related to the following joint ventures:
| (1) | SQM Vitas Fzco.
| (2) | SQM Vitas Holland B.V.
|  |  |  | Domicile |  | Country of incorporation |  | Share of interest in ownership |  | Dividends received |
SQM Vitas Brazil Agroindustria (1) |  | Production and commercialization of specialty plant and animal nutrition and industrial hygiene. |  | Via Cndeias, Km. 01 Sem Numero, Lote 4, Bairro Cia Norte, Candeias, Bahia. |  | Brazil |  | 49.99 | % | - |  | - |
SQM Vitas Peru S.A.C (1). |  | Production and commercialization of specialty plant and animal nutrition and industrial hygiene |  | Av. Juan de Arona 187, Torre B, Oficina 301-II, San Isidro, Lima |  | Peru |  | 50 | % | - |  | - |
SQM Vitas Plantacote B.V.(2) |  | Production and commercialization of controlled-released fertilizers |  | Herikerbergweg 238, 1101 CM Amsterdam Zuidoost |  | Holland |  | 50 | % | - |  | - |
Disclosure of reconciliation of summarised financial information of joint venture accounted for using equity method to carrying amount of interest in joint venture [text block] |
Joint Venture |  | Final reporting period date |  | Accounting method |
Sichuan SQM Migao Chemical Fertilizers Co Ltda. |  | December 31, 2017 |  | Equity method |
Coromandel SQM India |  | December 31, 2017 |  | Equity method |
SQM Vitas Fzco. |  | December 31, 2017 |  | Equity method |
SQM Star Qingdao Corp Nutrition Co., Ltd. |  | December 31, 2017 |  | Equity method |
SQM Vitas Brazil Agroindustria |  | December 31, 2017 |  | Equity method |
SQM Vitas Southern Africa Pty. |  | December 31, 2017 |  | Equity method |
SQM Vitas Perú S.A.C. |  | December 31, 2017 |  | Equity method |
SQM Vitas Holland B.V. |  | December 31, 2017 |  | Equity method |
SQM Vitas Plantacote B.V. |  | December 31, 2017 |  | Equity method |
Minera Exar S.A. |  | December 31, 2017 |  | Equity method |
Joint Venture |  | Equity-accounted investees |  | Share in profit (loss) of associates and joint ventures accounted for using the equity method |
|  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |
|  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |
Sichuan SQM Migao Chemical Fertilizers Co. Ltd. |  |  | 11,444 |  |  | 12,150 |  |  | 13,257 |  |  | (535) |  |  | (1,372) |  |  | (845) |
Coromandel SQM India |  |  | 1,633 |  |  | 1,499 |  |  | 962 |  |  | 165 |  |  | 435 |  |  | 88 |
SQM Vitas Fzco, |  |  | 19,478 |  |  | 17,956 |  |  | 11,604 |  |  | 1,502 |  |  | 3,458 |  |  | 369 |
SQM Star Qingdao Corp. Nutrition Co. Ltd. |  |  | 2,980 |  |  | 2,618 |  |  | 2,462 |  |  | 361 |  |  | 163 |  |  | 495 |
SQM Vitas Holland |  |  | 1,429 |  |  | 1,269 |  |  | 1,181 |  |  | (18) |  |  | 171 |  |  | (10) |
Minera Exar S.A. |  |  | 26,860 |  |  | 25,000 |  |  | - |  |  | (27) |  |  | - |  |  | - |
Total |  |  | 63,824 |  |  | 60,492 |  |  | 29,466 |  |  | 1,448 |  |  | 2,855 |  |  | 97 |
Joint Venture |  | Share on other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax |  | Share on total other comprehensive income of associates and joint ventures accounted for using the equity method |
|  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |
|  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |
Sichuan SQM Migao Chemical Fertilizers Co. Ltd. |  |  | - |  |  | - |  |  | (12) |  |  | (535) |  |  | (1,372) |  |  | (857) |
Coromandel SQM India |  |  | - |  |  | - |  |  | - |  |  | 165 |  |  | 435 |  |  | 88 |
SQM Vitas Fzco, |  |  | (5) |  |  | 449 |  |  | 9,686 |  |  | 1,497 |  |  | 3,907 |  |  | 10,055 |
SQM Star Qingdao Corp. Nutrition Co. Ltd. |  |  | - |  |  | - |  |  | - |  |  | 361 |  |  | 163 |  |  | 495 |
SQM Vitas Holland |  |  | - |  |  | - |  |  | - |  |  | (18) |  |  | 171 |  |  | (11) |
Minera Exar S.A. |  |  | - |  |  |  |  |  |  |  |  | (27) |  |  | - |  |  |  |
Total |  |  | (5) |  |  | 449 |  |  | 9,674 |  |  | 1,443 |  |  | 3,304 |  |  | 9,770 |
Joint Venture |  | Equity-accounted investees |  | Share in profit (loss) of associates and joint ventures accounted for using the equity method |
|  | 12/31/2017 |  |  | 12/31/2016 |  |  | 12/31/2015 |  |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |
|  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  |  | ThUS$ |  | ThUS$ |  | ThUS$ |
SQM Vitas Brazil Agroindustria(1) |  |  | 11,003 |  |  | 9,343 |  |  | 3,722 |  |  | 1,753 |  |  | 4,570 |  |  | (72) |
SQM Vitas Peru S.A.C (1) |  |  | 5,961 |  |  | 5,964 |  |  | 5,061 |  |  | (216) |  |  | 815 |  |  | 786 |
SQM Vitas Plantacote B.V. (2) |  |  | 669 |  |  | 588 |  |  | 3,598 |  |  | (1) |  |  | 187 |  |  | 215 |
SQM Vitas Spain (2) |  |  | - |  |  | - |  |  | 1,182 |  |  | - |  |  | - |  |  | (251) |
Total |  |  | 17,633 |  |  | 15,895 |  |  | 13,563 |  |  | 1,536 |  |  | 5,572 |  |  | 678 |
Joint Venture |  | Share in other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax |  | Share in total other comprehensive income of associates and joint ventures accounted for using the equity method |
|  | 12/31/2017 |  | 12/31/2016 |  |  | 12/31/2015 |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |
|  | ThUS$ |  | ThUS$ |  |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |
SQM Vitas Brazil Agroindustria(1) |  |  | (51) |  |  | 2,845 |  |  | - |  |  | 826 |  |  | 5,130 |  |  | (36) |
SQM Vitas Peru S.A.C (1) |  |  | - |  |  | - |  |  | - |  |  | (108) |  |  | 408 |  |  | 393 |
SQM Vitas Plantacote B.V. (2) |  |  | - |  |  | - |  |  | - |  |  | (1) |  |  | (80) |  |  | (125) |
SQM Vitas Spain (2) |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 109 |
Total |  |  | (51) |  |  | 2,845 |  |  | - |  |  | 717 |  |  | 5,458 |  |  | 341
Disclosure of assets,liabilities,revenue and expenses from joint venure explanatory [Text Block] | Assets, liabilities, revenue and expenses from joint ventures:
|  | 12/31/2017 |
|  | Assets |  | Liabilities |  |  |  |  | Gain (loss) from continuing |  | Other comprehensive |  | Comprehensive |
Joint Venture |  | Current |  | Non-current |  |  | Current |  | Non-current |  | Revenue |  | operations |  | income |  | income |
|  | ThUS$ |  | ThUS$ |  |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |
Sichuan SQM Migao Chemical Fertilizers Co. Ltda. |  |  | 31,461 |  |  | 6,656 |  |  | 15,228 |  |  | - |  |  | 13,326 |  |  | (1,070) |  |  | - |  |  | (1,070) |
Coromandel SQM India |  |  | 6,659 |  |  | 862 |  |  | 4,205 |  |  | 53 |  |  | 10,381 |  |  | 332 |  |  | - |  |  | 332 |
SQM Vitas Fzco, |  |  | 23,699 |  |  | 17,479 |  |  | 2,221 |  |  | - |  |  | 15,518 |  |  | 3,003 |  |  | (9) |  |  | 2,994 |
SQM Star Qingdao Corp. Nutrition Co. Ltd. |  |  | 6,941 |  |  | 171 |  |  | 1,152 |  |  | - |  |  | 12,631 |  |  | 721 |  |  | - |  |  | 721 |
SQM Vitas Brazil Agroindustria |  |  | 30,303 |  |  | 8,453 |  |  | 27,752 |  |  | - |  |  | 60,131 |  |  | 1,753 |  |  | (101) |  |  | 1,652 |
SQM Vitas Peru S.A.C |  |  | 20,933 |  |  | 8,534 |  |  | 17,380 |  |  | 6,126 |  |  | 35,299 |  |  | (216) |  |  | - |  |  | (216) |
SQM Vitas Holland B.V |  |  | 2,190 |  |  | 669 |  |  | - |  |  | - |  |  | - |  |  | (36) |  |  | - |  |  | (36) |
SQM Vitas Plantacote B.V. |  |  | 679 |  |  | - |  |  | 10 |  |  | - |  |  | - |  |  | (1) |  |  | - |  |  | (1) |
Minera Exar S.A. |  |  | 19,277 |  |  | 73,114 |  |  | 38,670 |  |  | - |  |  | - |  |  | (53) |  |  | - |  |  | (53) |
Total |  |  | 142,142 |  |  | 115,938 |  |  | 106,618 |  |  | 6,179 |  |  | 147,286 |  |  | 4,433 |  |  | (110) |  |  | 4,323 |
|  | 12/31/2016 |
|  | Assets |  | Liabilities |  |  |  |  | Gain (loss) from continuing |  | Other comprehensive |  | Comprehensive |
Joint Venture |  | Current |  | Non-current |  | Current |  | Non-current |  | Revenue |  | operations |  | income |  | Income |
|  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |
Sichuan SQM Migao Chemical Fertilizers Co. Ltda. |  |  | 43,639 |  |  | 7,399 |  |  | 26,738 |  |  | - |  |  | 16,051 |  |  | (2,744) |  |  | - |  |  | (2,744) |
Coromandel SQM India |  |  | 4,485 |  |  | 847 |  |  | 2,334 |  |  | - |  |  | 8,034 |  |  | 870 |  |  | - |  |  | 870 |
SQM Vitas Fzco. |  |  | 20,896 |  |  | 16,395 |  |  | 1,380 |  |  | - |  |  | 16,210 |  |  | 6,916 |  |  | 897 |  |  | 7,813 |
SQM Star Qingdao Corp. Nutrition Co. Ltd. |  |  | 5,733 |  |  | 203 |  |  | 697 |  |  | - |  |  | 7,553 |  |  | 325 |  |  | - |  |  | 325 |
SQM Vitas Brazil Agroindustria |  |  | 21,511 |  |  | 8,917 |  |  | 21,085 |  |  | - |  |  | 63,055 |  |  | 4,570 |  |  | 5,690 |  |  | 10,260 |
SQM Vitas Peru S.A.C |  |  | 23,598 |  |  | 8,931 |  |  | 20,333 |  |  | 6,231 |  |  | 36,926 |  |  | 815 |  |  | - |  |  | 815 |
SQM Vitas Holland B.V |  |  | 1,961 |  |  | 588 |  |  | 11 |  |  | - |  |  | - |  |  | 342 |  |  | - |  |  | 342 |
SQM Vitas Plantacote B.V. |  |  | 619 |  |  | - |  |  | 31 |  |  | - |  |  | - |  |  | (159) |  |  | - |  |  | (159) |
Total |  |  | 122,442 |  |  | 43,280 |  |  | 72,609 |  |  | 6,231 |  |  | 147,829 |  |  | 10,935 |  |  | 6,587 |  |  | 17,522 |
|  | 12/31/2015 |
|  | Assets |  | Liabilities |  |  |  |  | Gain (loss) from continuing |  | Other comprehensive |  | Comprehensive |
Joint Venture |  | Current |  | Non-current |  | Current |  | Non-current |  | Revenue |  | operations |  | income |  | income |
|  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |
Sichuan SQM Migao Chemical Fertilizers Co. Ltda. |  |  | 56,053 |  |  | 8,023 |  |  | 37,563 |  |  | - |  |  | 65,929 |  |  | (1,689) |  |  | (24) |  |  | (1,713) |
Coromandel SQM India |  |  | 3,738 |  |  | 924 |  |  | 2,668 |  |  | 70 |  |  | 5,816 |  |  | 176 |  |  | - |  |  | 176 |
SQM Vitas Fzco. |  |  | 14,096 |  |  | 10,575 |  |  | 1,464 |  |  | - |  |  | 17,893 |  |  | 738 |  |  | 19,371 |  |  | 20,109 |
SQM Star Qingdao Corp. Nutrition Co. Ltd. |  |  | 5,100 |  |  | 202 |  |  | 377 |  |  | - |  |  | 10,539 |  |  | 990 |  |  | - |  |  | 990 |
SQM Vitas Brazil Agroindustria |  |  | 32,449 |  |  | 6,638 |  |  | 35,365 |  |  | - |  |  | 67,870 |  |  | (72) |  |  | - |  |  | (72) |
SQM Vitas Peru S.A.C |  |  | 24,432 |  |  | 6,562 |  |  | 25,933 |  |  | - |  |  | 45,739 |  |  | 786 |  |  | - |  |  | 786 |
SQM Vitas Spain |  |  | 1,662 |  |  | 729 |  |  | 1,208 |  |  | - |  |  | 11,875 |  |  | 218 |  |  | - |  |  | 218 |
SQM Vitas Holland B.V |  |  | 428 |  |  | 1,955 |  |  | 18 |  |  | - |  |  | - |  |  | (21) |  |  | - |  |  | (21) |
SQM Vitas Plantacote B.V. |  |  | 802 |  |  | - |  |  | 30 |  |  | - |  |  | - |  |  | (250) |  |  | - |  |  | (250) |
Total |  |  | 138,760 |  |  | 35,608 |  |  | 104,626 |  |  | 70 |  |  | 225,661 |  |  | 876 |  |  | 19,347 |  |  | 20,223 |
Disclosure of detailed information about other joint venture information explanatory [Text Block] | Other Joint Venture disclosures:
|  | Cash and cash equivalents |  | Other current financial liabilities |  | Other non-current financial liabilities |
|  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2017 |  | 12/31/2016 |
|  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$$ |
Sichuan SQM Migao Chemical Fertilizers Co. Ltda. |  |  | 6,198 |  |  | 4,097 |  |  | - |  |  | - |  |  | - |  |  | - |
Coromandel SQM India |  |  | 1,118 |  |  | 15 |  |  | - |  |  | 478 |  |  | - |  |  | - |
SQM Vitas Fzco, |  |  | 15,307 |  |  | 11,514 |  |  | - |  |  | - |  |  | - |  |  | - |
SQM Star Qingdao Corp. Nutrition Co. Ltd. |  |  | 3,675 |  |  | 3,756 |  |  | - |  |  | - |  |  | - |  |  | - |
SQM Vitas Brazil Agroindustria |  |  | 5,139 |  |  | 2,168 |  |  | 7,342 |  |  | 8,718 |  |  | - |  |  | - |
SQM Vitas Peru S.A.C. |  |  | 687 |  |  | 958 |  |  | 2,215 |  |  | 3,834 |  |  | 1,372 |  |  | 1,781 |
SQM Vitas Holland B.V |  |  | 2,190 |  |  | 1,961 |  |  | - |  |  | - |  |  | - |  |  | - |
SQM Vitas Plantacote B.V |  |  | 679 |  |  | 615 |  |  | - |  |  | - |  |  | - |  |  | - |
Minera Exar S.A. |  |  | 9,189 |  |  | - |  |  | - |  |  | - |  |  | - |  |  |  |
Total |  |  | 44,182 |  |  | 25,084 |  |  | 9,557 |  |  | 13,030 |  |  | 1,372 |  |  | 1,781 |
|  | Depreciation and amortization expense |  | Interest expense |  | Income tax expense, continuing operations |
|  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |  | 12/31/2017 |  | 12/31/2016 |  | 12/31/2015 |
|  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |  | ThUS$ |
Sichuan SQM Migao Chemical Fertilizers Co. Ltda. |  |  | (696) |  |  | (691) |  |  | (687) |  |  | (25) |  |  | (433) |  |  | (241) |  |  | 303 |  |  | 200 |  |  | 233 |
Coromandel SQM India |  |  | - |  |  | - |  |  | (69) |  |  | (16) |  |  | (49) |  |  | (73) |  |  | (485) |  |  | (44) |  |  | (89) |
SQM Vitas Fzco. |  |  | (553) |  |  | (717) |  |  | (1,067) |  |  | (19) |  |  | (16) |  |  | (10) |  |  | - |  |  | - |  |  | - |
SQM Star Qingdao Corp. Nutrition Co. Ltd. |  |  | (68) |  |  | (64) |  |  | (66) |  |  | - |  |  | (1) |  |  | (2) |  |  | (174) |  |  | (195) |  |  | (378) |
SQM Vitas Brazil Agroindustria |  |  | (453) |  |  | (438) |  |  | (29) |  |  | (1,253) |  |  | (2,127) |  |  | (1,651) |  |  | (283) |  |  | (337) |  |  | (49) |
SQM Vitas Peru S.A.C. |  |  | (375) |  |  | (82) |  |  | (29) |  |  | (432) |  |  | (323) |  |  |  |  |  | (214) |  |  | (362) |  |  | (370) |
SQM Vitas Holland B.V |  |  | - |  |  | - |  |  | - |  |  | - |  |  | - |  |  | (2) |  |  | - |  |  | - |  |  | - |
SQM Vitas Plantacote B.V |  |  | - |  |  | - |  |  | - |  |  | (1) |  |  | (1) |  |  |  |  |  | - |  |  | - |  |  | - |
Minera Exar S.A. |  |  | (523) |  |  | - |  |  | - |  |  | (32) |  |  | - |  |  | (3) |  |  | (620) |  |  | - |  |  | - |
SQM Vitas Spain |  |  | - |  |  | - |  |  | (116) |  |  | - |  |  | - |  |  | (4) |  |  | - |  |  | - |  |  | (73) |
Total |  |  | (2,668) |  |  | (1,992) |  |  | (2,063) |  |  | (1,778) |  |  | (2,950) |  |  | (1,986) |  |  | (1,473) |  |  | (738) |  |  | (726) |

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