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Joint Ventures - Investments Accounted for Under Equity Method of Accounting (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement [Line Items]      
Investments accounted for using equity method $ 54,386 $ 39,824 $ 85,993
Sichuan SQM Migao Chemical Fertilizers Co Ltd.      
Statement [Line Items]      
Investments accounted for using equity method 0 0 9,028
Share in profit (loss) of joint ventures accounted for using the equity method 0 0 (280)
Share on other comprehensive income joint ventures accounted for using the equity method 0 0 0
Share on total comprehensive income of joint ventures accounted for using the equity method 0 0 (280)
Coromandel SQM India      
Statement [Line Items]      
Share on other comprehensive income joint ventures accounted for using the equity method 0 0 0
Share on total comprehensive income of joint ventures accounted for using the equity method 0 0  
SQM Vitas Fzco.      
Statement [Line Items]      
Investments accounted for using equity method 20,793 8,682 9,720
Share in profit (loss) of joint ventures accounted for using the equity method 8,208 6,304 2,010
Share on other comprehensive income joint ventures accounted for using the equity method 674 429 (1,469)
Share on total comprehensive income of joint ventures accounted for using the equity method 8,882 6,733 541
SQM Qinqdao Star Corp Nutrition Co. Ltd.      
Statement [Line Items]      
Investments accounted for using equity method 0 0  
Share in profit (loss) of joint ventures accounted for using the equity method 0 0 83
Share on other comprehensive income joint ventures accounted for using the equity method 0 0 0
Share on total comprehensive income of joint ventures accounted for using the equity method 0 0 83
SQM Vitas Brasil Agroindustria      
Statement [Line Items]      
Investments accounted for using equity method 14,667 0 3,511
Share in profit (loss) of joint ventures accounted for using the equity method 5,834 4,582 1,018
Share on other comprehensive income joint ventures accounted for using the equity method 551 (429) (1,469)
Share on total comprehensive income of joint ventures accounted for using the equity method 6,385 4,153 (451)
SQM Vitas Peru S.A.C.      
Statement [Line Items]      
Investments accounted for using equity method 1,340 4,681 1,659
Share in profit (loss) of joint ventures accounted for using the equity method 2,293 1,645 660
Share on other comprehensive income joint ventures accounted for using the equity method 0 0  
Share on total comprehensive income of joint ventures accounted for using the equity method 2,293 1,645 660
SQM Vitas B.V.      
Statement [Line Items]      
Share on other comprehensive income joint ventures accounted for using the equity method 0 0 0
Share on total comprehensive income of joint ventures accounted for using the equity method 0 0  
Joint ventures      
Statement [Line Items]      
Investments accounted for using equity method 16,007 4,681 5,170
Share in profit (loss) of joint ventures accounted for using the equity method 8,127 6,227 1,678
Share on other comprehensive income joint ventures accounted for using the equity method 551 (429) (1,469)
Share on total comprehensive income of joint ventures accounted for using the equity method 8,678 5,798 209
Pavoni & C. Spa      
Statement [Line Items]      
Investments accounted for using equity method 7,315 7,030 7,222
Share in profit (loss) of joint ventures accounted for using the equity method 470 174 9
Share on other comprehensive income joint ventures accounted for using the equity method (210) (317) 349
Share on total comprehensive income of joint ventures accounted for using the equity method 260 (143) 358
Covalent Lithium Pty Ltd.      
Statement [Line Items]      
Investments accounted for using equity method 0 0  
Share in profit (loss) of joint ventures accounted for using the equity method 0 0 0
Share on other comprehensive income joint ventures accounted for using the equity method 90 37 16
Share on total comprehensive income of joint ventures accounted for using the equity method 90 37 16
Joint Venture Total [Member]      
Statement [Line Items]      
Investments accounted for using equity method 28,108 15,712 25,970
Share in profit (loss) of joint ventures accounted for using the equity method 8,678 6,478 1,822
Share on other comprehensive income joint ventures accounted for using the equity method 554 149 (1,104)
Share on total comprehensive income of joint ventures accounted for using the equity method $ 9,232 $ 6,627 $ 718