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Financial instruments (Details 12) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Jan. 15, 2018
Financial instruments [Line Items]      
Tax ID No. Total Foreign  
Company   SQM S.A.  
Financial institution   Scotiabank Cayman  
Effective rate     3.25%
Notional amounts $ 148,728 $ 16,796  
Current amounts 199    
Borrowing costs 0 (1,651)  
Total 199    
Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts 12    
Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts $ 187    
Bank borrowings [Member]      
Financial instruments [Line Items]      
Current amounts   300  
Borrowing costs   0  
Total   300  
Bank borrowings [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts   52  
Bank borrowings [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts   248  
Bank borrowing One [Member]      
Financial instruments [Line Items]      
Tax ID No. 93.007.000-9    
Company SQM S.A.    
Country Chile    
Tax ID No. Foreign    
Financial institution Scotiabank Cayman    
Country USA    
Currency or adjustment index US$    
Repayment Upon maturity    
Borrowings Expiration Date May 29, 2023    
Effective rate 2.11%    
Nominal rate 3.01%    
Current amounts   248  
Borrowing costs   0  
Total   248  
Bank borrowing One [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts   0  
Bank borrowing One [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts   $ 248  
Bank borrowing Two [Member]      
Financial instruments [Line Items]      
Company   Nitratos Naturais do Chile Lim  
Financial institution   Banco ITAU Brasil  
Current amounts   $ 11  
Borrowing costs   0  
Total   11  
Bank borrowing Two [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts   11  
Bank borrowing Two [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts   $ 0  
Bank borrowing Three [Member]      
Financial instruments [Line Items]      
Tax ID No. SQM S.A. 93.007.000-9  
Company   SQM Brasil Limitada  
Country   Chile  
Tax ID No.   Foreign  
Financial institution Scotiabank Cayman Banco ITAU Brasil  
Country   USA  
Currency or adjustment index   US$  
Repayment   Upon maturity  
Borrowings Expiration Date   May 29, 2023  
Effective rate   3.60%  
Nominal rate   3.98%  
Notional amounts $ 0    
Current amounts 187 $ 41  
Borrowing costs 0 0  
Total 187 41  
Bank borrowing Three [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 0 41  
Current amounts 0    
Bank borrowing Three [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 0 $ 0  
Current amounts $ 187    
Foreign Bank Borrowings One [Member]      
Financial instruments [Line Items]      
Tax ID No. Nitratos Naturais do Chile Foreign  
Company Nitratos Naturais do Chile Lim. Nitratos Naturais do Chile Lim  
Country Brazil Brazil  
Tax ID No. Foreign Foreign  
Financial institution Banco Itau Brasil Banco ITAU Brasil  
Country Brazil Brazil  
Currency or adjustment index BRL BRL  
Repayment Upon maturity Upon maturity  
Borrowings Expiration Date Dec. 31, 2019 Jan. 31, 2019  
Effective rate 13.57% 5.17%  
Nominal rate 4.25% 5.17%  
Notional amounts $ 0    
Current amounts 12    
Borrowing costs 0    
Total 12    
Foreign Bank Borrowings One [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts $ 12    
Foreign Bank Borrowings Two [Member]      
Financial instruments [Line Items]      
Tax ID No.   Foreign  
Company   SQM Brasil Limitada  
Country   Brazil  
Tax ID No.   Foreign  
Financial institution   Banco ITAU Brasil  
Country   Brazil  
Currency or adjustment index   BRL  
Repayment   Upon maturity  
Borrowings Expiration Date   Jan. 31, 2019  
Effective rate   5.50%  
Nominal rate   5.50%