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Intangible assets and goodwill (Details 5) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance $ 34,866 $ 37,972
Additional 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 34,726 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses (140) (3,254)
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 (3,106)
Total increase (decrease) (140) (3,106)
Total increase (decrease) (1,132) 72,457
Goodwill Ending Balance 34,726 34,866
Gross carrying amount [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 38,120 37,972
Additional 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 148
Total increase (decrease) 0 148
Total increase (decrease) 4,268 83,460
Goodwill Ending Balance 38,120 38,120
Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance (3,254) 0
Additional 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses (140) 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 (3,254)
Total increase (decrease) (140) (3,254)
Goodwill Ending Balance (3,394) (3,254)
SQM Industrial S.A. [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 3,214 3,214
Additional 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses (3,214) 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 (3,214)
Total increase (decrease) 0 (3,214)
Goodwill Ending Balance 3,214 3,214
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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance   3,214
SQM Industrial S.A. [Member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance (3,214) 0
Additional 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 (3,214)
Total increase (decrease) 0 (3,214)
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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance   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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 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 0
Additional 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 148
Total increase (decrease) 0 148
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 0
Additional 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 148
Total increase (decrease) 0 148
Goodwill Ending Balance   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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance   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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 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 280 320
Additional 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 140 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses (180) 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 (40)
Total increase (decrease) (140) (40)
Goodwill Ending Balance 140 280
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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance   320
Soquimich Comercial S.A. [Member] | Accumulated impairment [member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance (40) 0
Additional 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses (140) 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 (40)
Total increase (decrease) (140) (40)
Goodwill Ending Balance (180) (40)
Soquimich European Holding B.V. [Member]    
Disclosure of reconciliation of changes in goodwill [line items]    
Goodwill Begining Balance 11,373 11,373
Additional 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 11,373 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance 11,373 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 0 0
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance   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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 0
Total increase (decrease) 0 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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance   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
Recognition subsequent to deferred tax assets 0 0
Decreases for classification as held for sale 0 0
Goodwill write-off without having been included previously in disposal groups classified as held for sale 0 0
Impairment losses 0 0
Increase (decrease) for net exchange differences 0 0
Increase (decrease) due to other changes 0 0
Total increase (decrease) 0 0
Goodwill Ending Balance $ 0 $ 0