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Financial instruments (Details 13) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Oct. 31, 2018
Financial instruments [Line Items]      
Company SQM S.A.    
Notional amount $ 39,031 $ 282,914  
Current maturities 39,031 282,914  
Borrowing costs (2,250) (2,336)  
Total 36,781 280,578  
NotLaterThanThreeMonths [Member]      
Financial instruments [Line Items]      
Notional amount 33,154 24,390  
Current maturities 33,154 24,390  
LaterThanThreeMonthsAndNotLaterThanOneYear [Member]      
Financial instruments [Line Items]      
Notional amount 5,877 258,524  
Current maturities $ 5,877 $ 258,524  
Single series bond One [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  
Number of registration or ID of the instrument - -  
Maturity date 01/28/2021 04/21/2020  
Currency or adjustment index US$ US$  
Payment of interest Semiannual Semiannual  
Nominal rate 4.38% 5.50%  
Effective rate 1.95% 0.43%  
Repayment Upon maturity Upon maturity  
Notional amount $ 4,648 $ 252,674  
Current maturities 4,648 252,674  
Borrowing costs (433) (386)  
Total 4,215 252,288  
Single series bond One [Member] | NotLaterThanThreeMonths [Member]      
Financial instruments [Line Items]      
Notional amount 4,648 0  
Current maturities 4,648 0  
Single series bond One [Member] | LaterThanThreeMonthsAndNotLaterThanOneYear [Member]      
Financial instruments [Line Items]      
Notional amount 0 252,674  
Current maturities $ 0 $ 252,674  
Single series bond Two [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  
Number of registration or ID of the instrument - -  
Maturity date 04/03/2021 01/28/2020  
Currency or adjustment index US$ US$  
Payment of interest Semiannual Semiannual  
Nominal rate 3.63% 4.38%  
Effective rate 1.08% 2.35%  
Repayment Upon maturity Upon maturity  
Notional amount $ 2,658 $ 4,648  
Current maturities 2,658 4,648  
Borrowing costs (614) (433)  
Total 2,044 4,215  
Single series bond Two [Member] | NotLaterThanThreeMonths [Member]      
Financial instruments [Line Items]      
Notional amount 0 4,648  
Current maturities 0 4,648  
Single series bond Two [Member] | LaterThanThreeMonthsAndNotLaterThanOneYear [Member]      
Financial instruments [Line Items]      
Notional amount 2,658 0  
Current maturities $ 2,658 $ 0  
Single series bond Three [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  
Number of registration or ID of the instrument - -  
Maturity date 05/07/2021 04/03/2020  
Currency or adjustment index US$ US$  
Payment of interest Semiannual Semiannual  
Nominal rate 4.25% 3.63%  
Effective rate 3.59% 1.42%  
Repayment Upon maturity Upon maturity  
Notional amount $ 7,508 $ 2,658  
Current maturities 7,508 2,658  
Borrowing costs (679) (614)  
Total 6,829 2,044  
Single series bond Three [Member] | NotLaterThanThreeMonths [Member]      
Financial instruments [Line Items]      
Notional amount 7,508 0  
Current maturities 7,508 0  
Single series bond Three [Member] | LaterThanThreeMonthsAndNotLaterThanOneYear [Member]      
Financial instruments [Line Items]      
Notional amount 0 2,658  
Current maturities $ 0 $ 2,658  
Single Series Bond Four [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  
Number of registration or ID of the instrument - -  
Maturity date 01/22/2021 05/07/2020  
Currency or adjustment index US$ US$  
Payment of interest Semiannual Semiannual  
Nominal rate 4.25% 4.25%  
Effective rate 4.17% 4.07%  
Repayment Upon maturity Upon maturity  
Notional amount $ 2,869 $ 2,869  
Current maturities 2,869 2,869  
Borrowing costs (237) (679)  
Total 2,632 2,190  
Single Series Bond Four [Member] | NotLaterThanThreeMonths [Member]      
Financial instruments [Line Items]      
Notional amount 0 0  
Current maturities 0 0  
Single Series Bond Four [Member] | LaterThanThreeMonthsAndNotLaterThanOneYear [Member]      
Financial instruments [Line Items]      
Notional amount 2,869 2,869  
Current maturities $ 2,869 $ 2,869  
Series H bonds [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  
Number of registration or ID of the instrument 564 564  
Maturity date 01/05/2021 01/05/2020  
Currency or adjustment index UF UF  
Payment of interest Semiannual Semiannual  
Nominal rate 4.90% 4.90%  
Effective rate 0.58% 1.36%  
Repayment Semiannual Semiannual  
Notional amount $ 18,212 $ 17,166  
Current maturities 18,212 17,166  
Borrowing costs (172) (139)  
Total 18,040 17,027  
Series H bonds [Member] | NotLaterThanThreeMonths [Member]      
Financial instruments [Line Items]      
Notional amount 18,212 17,166  
Current maturities 18,212 17,166  
Series H bonds [Member] | LaterThanThreeMonthsAndNotLaterThanOneYear [Member]      
Financial instruments [Line Items]      
Notional amount 0 0  
Current maturities $ 0 $ 0  
Series O bonds [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  
Number of registration or ID of the instrument 699 699  
Maturity date 02/01/2021 02/01/2020  
Currency or adjustment index UF UF  
Payment of interest Semiannual Semiannual  
Nominal rate 3.80% 3.80%  
Effective rate 2.24% 2.41%  
Repayment Upon maturity Upon maturity  
Notional amount $ 962 $ 890  
Current maturities 962 890  
Borrowing costs (82) (67)  
Total 880 823  
Series O bonds [Member] | NotLaterThanThreeMonths [Member]      
Financial instruments [Line Items]      
Notional amount 962 890  
Current maturities 962 890  
Series O bonds [Member] | LaterThanThreeMonthsAndNotLaterThanOneYear [Member]      
Financial instruments [Line Items]      
Notional amount 0 0  
Current maturities $ 0 $ 0  
Series P bonds [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  
Number of registration or ID of the instrument 563 563  
Maturity date 01/15/2021 01/15/2020  
Currency or adjustment index UF UF  
Payment of interest Semiannual Semiannual  
Nominal rate 3.25% 3.25%  
Effective rate 2.37% 2.71%  
Repayment Upon maturity Upon maturity  
Notional amount $ 1,824 $ 1,686  
Current maturities 1,824 1,686  
Borrowing costs (12) (12)  
Total 1,812 1,674  
Series P bonds [Member] | NotLaterThanThreeMonths [Member]      
Financial instruments [Line Items]      
Notional amount 1,824 1,686  
Current maturities 1,824 1,686  
Series P bonds [Member] | LaterThanThreeMonthsAndNotLaterThanOneYear [Member]      
Financial instruments [Line Items]      
Notional amount 0 0  
Current maturities $ 0 $ 0  
Series Q bonds [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  
Number of registration or ID of the instrument 700 700  
Maturity date 06/01/2021 06/01/2020  
Currency or adjustment index UF UF  
Payment of interest Semiannual Semiannual  
Nominal rate 3.45% 3.45%  
Effective rate 2.92% 3.11% 3.45%
Repayment Upon maturity Upon maturity  
Notional amount $ 350 $ 323  
Current maturities 350 323  
Borrowing costs (21) (6)  
Total 329 317  
Series Q bonds [Member] | NotLaterThanThreeMonths [Member]      
Financial instruments [Line Items]      
Notional amount 0 0  
Current maturities 0 0  
Series Q bonds [Member] | LaterThanThreeMonthsAndNotLaterThanOneYear [Member]      
Financial instruments [Line Items]      
Notional amount 350 323  
Current maturities $ 350 $ 323