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Joint Ventures (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Investments accounted for using equity method $ 111,549 $ 152,630 $ 133,140
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 5,081 13,004 10,192
Share of total comprehensive income of associates and joint ventures accounted for using equity method 504 717 5,458
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax (1,177) 26 2,845
Sichuan SQM Migao Chemical Fertilizers Co Ltd [Member]      
Investments accounted for using equity method [1] 1,992 11,444 12,150
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [1] (650) (535) (1,372)
Share of total comprehensive income of associates and joint ventures accounted for using equity method [1] (650) (535) (1,372)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [1] $ 0 0 0
Coromandel SQM India [Member]      
Name of joint venture Coromandel SQM India    
Date of end of reporting period of financial statements of joint venture Dec. 31, 2018    
Description of whether investment in joint venture is measured using equity method or at fair value Equity method    
Investments accounted for using equity method $ 1,729 1,633 1,499
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 174 165 435
Share of total comprehensive income of associates and joint ventures accounted for using equity method 174 165 435
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax $ 0 0 0
SQM Vitas Fzco. [Member]      
Name of joint venture SQM Vitas Fzco.    
Date of end of reporting period of financial statements of joint venture Dec. 31, 2018    
Description of whether investment in joint venture is measured using equity method or at fair value Equity method    
Investments accounted for using equity method $ 20,202 19,478 17,956
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 1,781 1,502 3,458
Share of total comprehensive income of associates and joint ventures accounted for using equity method 1,781 1,497 3,907
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax $ 0 (5) 449
SQM Star Qingdao Corp Nutrition Co., Ltd. [Member]      
Name of joint venture SQM Star Qingdao Corp Nutrition Co., Ltd.    
Date of end of reporting period of financial statements of joint venture Dec. 31, 2018    
Description of whether investment in joint venture is measured using equity method or at fair value Equity method    
Investments accounted for using equity method $ 3,168 2,980 2,618
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 188 361 163
Share of total comprehensive income of associates and joint ventures accounted for using equity method 189 361 163
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax $ 1 0 0
SQM Vitas Brazil Agroindustria [Member]      
Name of joint venture SQM Vitas Brazil Agroindustria    
Date of end of reporting period of financial statements of joint venture Dec. 31, 2018    
Description of whether investment in joint venture is measured using equity method or at fair value Equity method    
Investments accounted for using equity method [2] $ 12,405 11,003 9,343
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [2] 2,879 1,753 4,570
Share of total comprehensive income of associates and joint ventures accounted for using equity method [2] 779 826 5,130
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [2] $ (661) (51) 2,845
SQM Vitas Peru S.A.C. [Member]      
Name of joint venture SQM Vitas Perú S.A.C.    
Date of end of reporting period of financial statements of joint venture Dec. 31, 2018    
Description of whether investment in joint venture is measured using equity method or at fair value Equity method    
Investments accounted for using equity method [2] $ 5,188 5,961 5,964
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [2] (550) (216) 815
Share of total comprehensive income of associates and joint ventures accounted for using equity method [2] (275) (108) 408
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [2] $ 0 0 0
SQM Vitas Plantacote B.V [Member]      
Name of joint venture SQM Vitas Holland B.V.    
Date of end of reporting period of financial statements of joint venture Dec. 31, 2018    
Description of whether investment in joint venture is measured using equity method or at fair value Equity method    
Investments accounted for using equity method [3] $ 0 669 588
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [3] 0 (1) 187
Share of total comprehensive income of associates and joint ventures accounted for using equity method [3] 0 (1) (80)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [3] 0 0 0
Minera Exar S.A. [Member]      
Investments accounted for using equity method [1] 0 33,065 25,000
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [1] (206) (27) 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method [1] (206) (27) 0
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [1] (1) 0 0
SQM Vitas Holland [Member]      
Investments accounted for using equity method 1,345 1,429 1,269
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method (14) (18) 171
Share of total comprehensive income of associates and joint ventures accounted for using equity method (14) (18) 171
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax 0 0 0
Joint ventures [member]      
Investments accounted for using equity method 17,715 17,633 15,895
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 2,241 1,536 5,572
Share of total comprehensive income of associates and joint ventures accounted for using equity method 1,287 1,443 3,304
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax $ 0 (5) 449
Pavoni C Spa [Member]      
Name of joint venture Pavoni & C. Spa.    
Date of end of reporting period of financial statements of joint venture Dec. 31, 2018    
Description of whether investment in joint venture is measured using equity method or at fair value Equity method    
Investments accounted for using equity method $ 7,084 0 0
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method (39) 0 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method (40) 0 0
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax $ 0 0 0
Covalent Lithium Pty Ltd [Member]      
Name of joint venture Covalent Lithium Pty Ltd.    
Date of end of reporting period of financial statements of joint venture Dec. 31, 2018    
Description of whether investment in joint venture is measured using equity method or at fair value Equity method    
Investments accounted for using equity method $ 53 0 0
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 36 0 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method 53 0 0
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax $ 0 0 0
Arpa Speciali SRL [Member]      
Name of joint venture Arpa Speciali S.R.L.    
Date of end of reporting period of financial statements of joint venture Dec. 31, 2018    
Description of whether investment in joint venture is measured using equity method or at fair value Equity method    
Investments accounted for using equity method [4] $ 122 0 0
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [4] (88) 0 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method [4] 0 0 0
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [4] $ 0 $ 0 $ 0
[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.
[2] SQM Vitas Fzco.
[3] SQM Vitas Holland
[4] Pavoni &C.SPA