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Joint Ventures (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Investments accounted for using equity method $ 85,993 $ 109,435 $ 111,549
Sichuan SQM Migao Chemical Fertilizers Co Ltd [Member]      
Statement [Line Items]      
Investments accounted for using equity method [1],[2] 9,028 1,992 1,992
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [1] (280) (632) (650)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [1] 0 0 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method [1] (280) (632) (650)
Coromandel SQM India [Member]      
Statement [Line Items]      
Investments accounted for using equity method [2],[3] 0 1,568 1,729
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [3] 0 (98) 174
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [3] 0 (38) (159)
Share of total comprehensive income of associates and joint ventures accounted for using equity method [3] 0 (136) 15
SQM Vitas Fzco. [Member]      
Statement [Line Items]      
Investments accounted for using equity method [2] 9,720 9,111 20,202
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 2,010 1,797 1,781
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax (1,469) 437 (903)
Share of total comprehensive income of associates and joint ventures accounted for using equity method 541 2,234 878
SQM Star Qingdao Corp Nutrition Co., Ltd. [Member]      
Statement [Line Items]      
Investments accounted for using equity method [2],[3] 0 3,464 3,168
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [3] 83 296 188
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [3] 0 0 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method [3] 83 296 188
SQM Vitas Brazil Agroindustria [Member]      
Statement [Line Items]      
Investments accounted for using equity method [4] 3,511 5,347 5,915
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [4] 1,018 564 1,439
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [4] (1,469) (225) (792)
Share of total comprehensive income of associates and joint ventures accounted for using equity method [4] (451) 339 647
SQM Vitas Peru S.A.C. [Member]      
Statement [Line Items]      
Investments accounted for using equity method [4] 1,659 1,955 2,671
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [4] 660 211 (275)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [4] 0 661 (112)
Share of total comprehensive income of associates and joint ventures accounted for using equity method [4] 660 872 (387)
Minera Exar S.A. [Member]      
Statement [Line Items]      
Investments accounted for using equity method [2],[4] 0 0 0
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [4] 0 0 (206)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [4] 0 0 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method [4] 0 0 (206)
SQM Vitas BV [Member]      
Statement [Line Items]      
Investments accounted for using equity method [2] 0 1,304 1,345
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 0 (15) (14)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax 0 (27) (70)
Share of total comprehensive income of associates and joint ventures accounted for using equity method 0 (42) (84)
Joint ventures [member]      
Statement [Line Items]      
Investments accounted for using equity method 5,170 7,394 8,648
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 1,678 806 1,120
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax (1,469) 435 (904)
Share of total comprehensive income of associates and joint ventures accounted for using equity method 209 1,241 216
Pavoni C Spa [Member]      
Statement [Line Items]      
Investments accounted for using equity method [2] 7,222 6,864 7,084
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 9 36 (39)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax 349 (255) 70
Share of total comprehensive income of associates and joint ventures accounted for using equity method 358 (219) 31
Covalent Lithium Pty Ltd [Member]      
Statement [Line Items]      
Investments accounted for using equity method [2],[5] 0 40 53
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [5] 0 0 36
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [5] 16 (13) 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method [5] 16 (13) 36
Arpa Speciali SRL [Member]      
Statement [Line Items]      
Investments accounted for using equity method [5],[6] 0 92 62
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method [5],[6] 0 31 (44)
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax [5],[6] 0 (1) 0
Share of total comprehensive income of associates and joint ventures accounted for using equity method [5],[6] 0 30 (44)
Joint Venture Total [Member]      
Statement [Line Items]      
Investments accounted for using equity method [2] 25,970 24,343 35,573
Share of profit (loss) from continuing operations of associates and joint ventures accounted for using equity method 1,822 1,384 1,270
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax (1,104) 104 (1,062)
Share of total comprehensive income of associates and joint ventures accounted for using equity method $ 718 $ 1,488 $ 208
[1] See subsequent events in Notes 9.2 and 29.2.
[2] These investments include adjustments for unrealized gains.
[3] As of December 31, 2020, these investments were no longer part of the group, see note 9.2 (a).
[4] SQM Vitas Fzco.
[5] As of December 31, 2020, this joint venture has a negative value of ThUS$ (92), which is presented in Other non-current provisions.
[6] Pavoni & C. Spa.