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Significant accounting policies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Significant accounting policies [Line Items]    
Discount Rate For Pension Obligations 3.68% 4.642%
Amortization Period 10 years  
Bottom of range [member]    
Significant accounting policies [Line Items]    
Cash dividend rate 30.00%  
Top of range [member]    
Significant accounting policies [Line Items]    
Exemption From Lease As Low Value Asset $ 5,000  
SQM North America [Member]    
Significant accounting policies [Line Items]    
Discount Rate For Pension Obligations 4.00% 3.75%