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Financial instruments (Details 14) - 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 amount $ 148,728 $ 16,796  
Borrowing costs $ 0 $ (1,651)  
Bank Borrowings Chilean Tax [Member]      
Financial instruments [Line Items]      
Tax ID No. 93.007.000-9 93.007.000-9  
Company SQM S.A. SQM S.A  
Country Chile Chile  
Tax ID No. Foreign Foreign  
Financial institution Scotiabank Cayman Scotiabank Cayman  
Country USA USA  
Currency or adjustment index USD USD  
Effective rate 2.84% 3.98%  
Nominal rate 3.01% 3.98%  
Non current bonds issued [Member]      
Financial instruments [Line Items]      
Notional amount $ 70,000 $ 70,000  
Non-current maturities 70,000 70,000  
Borrowing costs (862) (1,130)  
Total $ 69,138 $ 68,870  
Non current bonds issued [Member] | Bank Borrowings Chilean Tax [Member]      
Financial instruments [Line Items]      
Company SQM S.A. SQM S.A.  
Financial institution Scotiabank Cayman Scotiabank Cayman  
Notional amount $ 70,000 $ 70,000  
Non-current maturities 70,000 70,000  
Borrowing costs (862) (1,130)  
Total 69,138 68,870  
Non current bonds issued [Member] | Between 1 year to 2 [member]      
Financial instruments [Line Items]      
Notional amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Between 1 year to 2 [member] | Bank Borrowings Chilean Tax [Member]      
Financial instruments [Line Items]      
Notional amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Between 2 years to 3 [member]      
Financial instruments [Line Items]      
Notional amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Between 2 years to 3 [member] | Bank Borrowings Chilean Tax [Member]      
Financial instruments [Line Items]      
Notional amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Between 3 Years to 4 [member]      
Financial instruments [Line Items]      
Notional amount 70,000 70,000  
Non-current maturities 70,000 70,000  
Non current bonds issued [Member] | Between 3 Years to 4 [member] | Bank Borrowings Chilean Tax [Member]      
Financial instruments [Line Items]      
Notional amount 70,000 70,000  
Non-current maturities $ 70,000 $ 70,000