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Financial instruments (Details 15) - 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  
Borrowing costs $ (2,250) $ (2,336)  
Single series bond One [Member]      
Financial instruments [Line Items]      
Tax ID 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  
Repayment Upon maturity Upon maturity  
Effective rate 1.95% 0.43%  
Nominal rate 4.38% 5.50%  
Notional Amount $ 4,648 $ 252,674  
Borrowing costs $ (433) $ (386)  
Single series bond Two [Member]      
Financial instruments [Line Items]      
Tax ID 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  
Repayment Upon maturity Upon maturity  
Effective rate 1.08% 2.35%  
Nominal rate 3.63% 4.38%  
Notional Amount $ 2,658 $ 4,648  
Borrowing costs $ (614) $ (433)  
Single series bond Three [Member]      
Financial instruments [Line Items]      
Tax ID 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  
Repayment Upon maturity Upon maturity  
Effective rate 3.59% 1.42%  
Nominal rate 4.25% 3.63%  
Notional Amount $ 7,508 $ 2,658  
Borrowing costs $ (679) $ (614)  
Single series bond Four [Member]      
Financial instruments [Line Items]      
Tax ID 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  
Repayment Upon maturity Upon maturity  
Effective rate 4.17% 4.07%  
Nominal rate 4.25% 4.25%  
Notional Amount $ 2,869 $ 2,869  
Borrowing costs $ (237) $ (679)  
Series H bonds [Member]      
Financial instruments [Line Items]      
Tax ID 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  
Repayment Semiannual Semiannual  
Effective rate 0.58% 1.36%  
Nominal rate 4.90% 4.90%  
Notional Amount $ 18,212 $ 17,166  
Borrowing costs $ (172) $ (139)  
Series O bonds [Member]      
Financial instruments [Line Items]      
Tax ID 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  
Repayment Upon maturity Upon maturity  
Effective rate 2.24% 2.41%  
Nominal rate 3.80% 3.80%  
Notional Amount $ 962 $ 890  
Borrowing costs $ (82) $ (67)  
Series Q bonds [Member]      
Financial instruments [Line Items]      
Tax ID 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  
Repayment Upon maturity Upon maturity  
Effective rate 2.92% 3.11% 3.45%
Nominal rate 3.45% 3.45%  
Notional Amount $ 350 $ 323  
Borrowing costs (21) (6)  
Non current bonds issued [Member]      
Financial instruments [Line Items]      
Notional Amount 1,833,056 1,414,192  
Non-current maturities 1,833,056 1,414,192  
Borrowing costs (16,430) (11,084)  
Total 1,816,626 1,403,108  
Non current bonds issued [Member] | Over 1 year to 2 [member]      
Financial instruments [Line Items]      
Notional Amount 0 13,749  
Non-current maturities 0 13,749  
Non current bonds issued [Member] | Over 2 years to 3 [member]      
Financial instruments [Line Items]      
Notional Amount 300,000 13,749  
Non-current maturities 300,000 13,749  
Non current bonds issued [Member] | Over 3 years to 4 [member]      
Financial instruments [Line Items]      
Notional Amount 0 313,749  
Non-current maturities 0 313,749  
Non current bonds issued [Member] | Over 4 Years to 5 [Member]      
Financial instruments [Line Items]      
Notional Amount 250,000 13,749  
Non-current maturities 250,000 13,749  
Non current bonds issued [Member] | Over 5 Years [Member]      
Financial instruments [Line Items]      
Notional Amount 1,283,056 1,059,196  
Non-current maturities $ 1,283,056 $ 1,059,196  
Non current bonds issued [Member] | Single series bond One [Member]      
Financial instruments [Line Items]      
Tax ID 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 01/28/2025 01/28/2025  
Currency or adjustment index US$ US$  
Payment of interest Semiannual Semiannual  
Repayment Upon maturity Upon maturity  
Effective rate 4.08% 4.08%  
Nominal rate 4.38% 4.38%  
Notional Amount $ 250,000 $ 250,000  
Non-current maturities 250,000 250,000  
Borrowing costs (1,336) (1,514)  
Total 248,664 248,486  
Non current bonds issued [Member] | Single series bond One [Member] | Over 1 year to 2 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Single series bond One [Member] | Over 2 years to 3 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Single series bond One [Member] | Over 3 years to 4 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Single series bond One [Member] | Over 4 Years to 5 [Member]      
Financial instruments [Line Items]      
Notional Amount 250,000 0  
Non-current maturities 250,000 0  
Non current bonds issued [Member] | Single series bond One [Member] | Over 5 Years [Member]      
Financial instruments [Line Items]      
Notional Amount 0 250,000  
Non-current maturities $ 0 $ 250,000  
Non current bonds issued [Member] | Single series bond Two [Member]      
Financial instruments [Line Items]      
Tax ID   93.007.000-9  
Company SQM S.A. SQM S.A.  
Country Chile Chile  
Number of registration or ID of the instrument - -  
Maturity date 04/03/2023 04/03/2023  
Currency or adjustment index US$ US$  
Payment of interest Semiannual Semiannual  
Repayment Upon maturity Upon maturity  
Effective rate 3.43% 3.43%  
Nominal rate 3.63% 3.63%  
Notional Amount $ 300,000 $ 300,000  
Non-current maturities 300,000 300,000  
Borrowing costs (781) (1,393)  
Total 299,219 298,607  
Non current bonds issued [Member] | Single series bond Two [Member] | Over 1 year to 2 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Single series bond Two [Member] | Over 2 years to 3 [member]      
Financial instruments [Line Items]      
Notional Amount 300,000 0  
Non-current maturities 300,000 0  
Non current bonds issued [Member] | Single series bond Two [Member] | Over 3 years to 4 [member]      
Financial instruments [Line Items]      
Notional Amount 0 300,000  
Non-current maturities 0 300,000  
Non current bonds issued [Member] | Single series bond Two [Member] | Over 4 Years to 5 [Member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Single series bond Two [Member] | Over 5 Years [Member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities $ 0 $ 0  
Non current bonds issued [Member] | Single series bond Three [Member]      
Financial instruments [Line Items]      
Tax ID   93.007.000-9  
Company SQM S.A. SQM S.A.  
Country Chile Chile  
Number of registration or ID of the instrument - -  
Maturity date 05/07/2029 05/07/2029  
Currency or adjustment index US$ US$  
Payment of interest Semiannual Semiannual  
Repayment Upon maturity Upon maturity  
Effective rate 4.18% 4.19%  
Nominal rate 4.25% 4.25%  
Notional Amount $ 450,000 $ 450,000  
Non-current maturities 450,000 450,000  
Borrowing costs (5,020) (5,923)  
Total 444,980 444,077  
Non current bonds issued [Member] | Single series bond Three [Member] | Over 1 year to 2 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Single series bond Three [Member] | Over 2 years to 3 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Single series bond Three [Member] | Over 3 years to 4 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Single series bond Three [Member] | Over 4 Years to 5 [Member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Single series bond Three [Member] | Over 5 Years [Member]      
Financial instruments [Line Items]      
Notional Amount 450,000 450,000  
Non-current maturities $ 450,000 $ 450,000  
Non current bonds issued [Member] | Single series bond Four [Member]      
Financial instruments [Line Items]      
Tax ID 93.007.000-9    
Company SQM S.A.    
Country Chile    
Number of registration or ID of the instrument -    
Maturity date 01/22/2050    
Currency or adjustment index US$    
Payment of interest Semiannual    
Repayment Upon maturity    
Effective rate 4.22%    
Nominal rate 4.25%    
Notional Amount $ 400,000    
Non-current maturities 400,000    
Borrowing costs (6,582)    
Total 393,418    
Non current bonds issued [Member] | Single series bond Four [Member] | Over 1 year to 2 [member]      
Financial instruments [Line Items]      
Notional Amount 0    
Non-current maturities 0    
Non current bonds issued [Member] | Single series bond Four [Member] | Over 2 years to 3 [member]      
Financial instruments [Line Items]      
Notional Amount 0    
Non-current maturities 0    
Non current bonds issued [Member] | Single series bond Four [Member] | Over 3 years to 4 [member]      
Financial instruments [Line Items]      
Notional Amount 0    
Non-current maturities 0    
Non current bonds issued [Member] | Single series bond Four [Member] | Over 4 Years to 5 [Member]      
Financial instruments [Line Items]      
Notional Amount 0    
Non-current maturities 0    
Non current bonds issued [Member] | Single series bond Four [Member] | Over 5 Years [Member]      
Financial instruments [Line Items]      
Notional Amount 400,000    
Non-current maturities $ 400,000    
Non current bonds issued [Member] | Series H bonds [Member]      
Financial instruments [Line Items]      
Tax ID 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 01/05/2030 01/05/2030  
Currency or adjustment index UF UF  
Payment of interest Semiannual Semiannual  
Repayment   Semiannual  
Effective rate 4.76% 4.78%  
Nominal rate 4.90% 4.90%  
Notional Amount $ 126,386 $ 130,617  
Non-current maturities 126,386 130,617  
Borrowing costs (1,378) (1,253)  
Total 125,008 129,364  
Non current bonds issued [Member] | Series H bonds [Member] | Over 1 year to 2 [member]      
Financial instruments [Line Items]      
Notional Amount 0 13,749  
Non-current maturities 0 13,749  
Non current bonds issued [Member] | Series H bonds [Member] | Over 2 years to 3 [member]      
Financial instruments [Line Items]      
Notional Amount 0 13,749  
Non-current maturities 0 13,749  
Non current bonds issued [Member] | Series H bonds [Member] | Over 3 years to 4 [member]      
Financial instruments [Line Items]      
Notional Amount 0 13,749  
Non-current maturities 0 13,749  
Non current bonds issued [Member] | Series H bonds [Member] | Over 4 Years to 5 [Member]      
Financial instruments [Line Items]      
Notional Amount 0 13,749  
Non-current maturities 0 13,749  
Non current bonds issued [Member] | Series H bonds [Member] | Over 5 Years [Member]      
Financial instruments [Line Items]      
Notional Amount 126,386 75,621  
Non-current maturities $ 126,386 $ 75,621  
Non current bonds issued [Member] | Series O bonds [Member]      
Financial instruments [Line Items]      
Tax ID 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 02/01/2033 02/01/2033  
Currency or adjustment index UF UF  
Payment of interest Semiannual Semiannual  
Repayment Upon maturity Upon maturity  
Effective rate 3.68% 3.70%  
Nominal rate 3.80% 5.50%  
Notional Amount $ 61,334 $ 56,715  
Non-current maturities 61,334 56,715  
Borrowing costs (904) (811)  
Total 60,430 55,904  
Non current bonds issued [Member] | Series O bonds [Member] | Over 1 year to 2 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series O bonds [Member] | Over 2 years to 3 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series O bonds [Member] | Over 3 years to 4 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series O bonds [Member] | Over 4 Years to 5 [Member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series O bonds [Member] | Over 5 Years [Member]      
Financial instruments [Line Items]      
Notional Amount 61,334 56,715  
Non-current maturities $ 61,334 $ 56,715  
Non current bonds issued [Member] | Series P Bonds [Member]      
Financial instruments [Line Items]      
Tax ID 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 01/15/2028 01/15/2028  
Currency or adjustment index UF UF  
Payment of interest Semiannual Semiannual  
Repayment Upon maturity Upon maturity  
Effective rate 3.24% 3.24%  
Nominal rate 3.25% 3.25%  
Notional Amount $ 122,668 $ 113,430  
Non-current maturities 122,668 113,430  
Borrowing costs (77) (89)  
Total 122,591 113,341  
Non current bonds issued [Member] | Series P Bonds [Member] | Over 1 year to 2 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series P Bonds [Member] | Over 2 years to 3 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series P Bonds [Member] | Over 3 years to 4 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series P Bonds [Member] | Over 4 Years to 5 [Member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series P Bonds [Member] | Over 5 Years [Member]      
Financial instruments [Line Items]      
Notional Amount 122,668 113,430  
Non-current maturities $ 122,668 $ 113,430  
Non current bonds issued [Member] | Series Q bonds [Member]      
Financial instruments [Line Items]      
Tax ID 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 06/01/2038 06/01/2038  
Currency or adjustment index UF UF  
Payment of interest Semiannual Semiannual  
Repayment Upon maturity Upon maturity  
Effective rate 3.43% 3.45%  
Nominal rate 3.45% 3.45%  
Notional Amount $ 122,668 $ 113,430  
Non-current maturities 122,668 113,430  
Borrowing costs (352) (101)  
Total 122,316 113,329  
Non current bonds issued [Member] | Series Q bonds [Member] | Over 1 year to 2 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series Q bonds [Member] | Over 2 years to 3 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series Q bonds [Member] | Over 3 years to 4 [member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series Q bonds [Member] | Over 4 Years to 5 [Member]      
Financial instruments [Line Items]      
Notional Amount 0 0  
Non-current maturities 0 0  
Non current bonds issued [Member] | Series Q bonds [Member] | Over 5 Years [Member]      
Financial instruments [Line Items]      
Notional Amount 122,668 113,430  
Non-current maturities $ 122,668 $ 113,430