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Intangible assets and goodwill (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance $ 34,726 $ 34,866
Additional 7,380 0
Impairment losses (140) (140)
Total increase (decrease) 7,240 (140)
Goodwill Ending Balance 41,966 34,726
Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 38,120 38,120
Additional 7,380 0
Impairment losses 0 0
Total increase (decrease) 7,380 0
Goodwill Ending Balance 45,500 38,120
Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance (3,394) (3,254)
Additional 0 0
Impairment losses (140) (140)
Total increase (decrease) (140) (140)
Goodwill Ending Balance (3,534) (3,394)
SQM Industrial S.A. [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 0 0
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 0 0
SQM Industrial S.A. [Member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 3,214 3,214
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 3,214 3,214
SQM Industrial S.A. [Member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance (3,214) (3,214)
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance (3,214) (3,214)
SQM S.A [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 22,255 22,255
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 22,255 22,255
SQM S.A [Member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 22,255 22,255
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 22,255 22,255
SQM S.A [Member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 0 0
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 0 0
SQM Iberian S.A. [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 148 148
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 148 148
SQM Iberian S.A. [Member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 148 148
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 148 148
SQM Iberian S.A. [Member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 0 0
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 0 0
SQM Investment Corporation N.V. [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 86 86
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 86 86
SQM Investment Corporation N.V. [Member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 86 86
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 86 86
SQM Investment Corporation N.V. [Member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 0 0
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 0 0
Soquimich Comercial S.A. [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 140 280
Additional 0 0
Impairment losses (140) (140)
Total increase (decrease) (140) (140)
Goodwill Ending Balance 0 140
Soquimich Comercial S.A. [Member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 320 320
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 320 320
Soquimich Comercial S.A. [Member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance (180) (40)
Additional 0 0
Impairment losses (140) (140)
Total increase (decrease) (140) (140)
Goodwill Ending Balance (320) (180)
Soquimich European Holding B.V. [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 11,373 11,373
Additional 10 0
Impairment losses 0 0
Total increase (decrease) 10 0
Goodwill Ending Balance 11,383 11,373
Soquimich European Holding B.V. [Member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 11,373 11,373
Additional 10 0
Impairment losses 0 0
Total increase (decrease) 10 0
Goodwill Ending Balance 11,383 11,373
Soquimich European Holding B.V. [Member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 0 0
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 0 0
Sqm Holland Bv [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 0  
Additional 7,370  
Impairment losses 0  
Total increase (decrease) 7,370  
Goodwill Ending Balance 7,370 0
Sqm Holland Bv [Member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 0  
Additional 7,370  
Impairment losses 0  
Total increase (decrease) 7,370  
Goodwill Ending Balance 7,370 0
Sqm Holland Bv [Member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 0  
Additional 0  
Impairment losses 0  
Total increase (decrease) 0  
Goodwill Ending Balance 0 0
SQM Potasio S.A. [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 724 724
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 724 724
SQM Potasio S.A. [Member] | Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 724 724
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 724 724
SQM Potasio S.A. [Member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 0 0
Additional 0 0
Impairment losses 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance $ 0 $ 0