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Financial instruments (Details 15) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Oct. 31, 2018
Jan. 15, 2018
Financial instruments [Line Items]        
Tax ID Total Foreign    
Company   SQM S.A.    
Effective rate       3.25%
Notional Amount $ 148,728 $ 16,796    
Borrowing costs $ 0 $ (1,651)    
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 04-21-2020 04-21-2019    
Currency or adjustment index US$ US$    
Payment of interest Semiannual Semiannual    
Repayment Upon maturity Upon maturity    
Effective rate 0.43% 0.95%    
Nominal rate 5.50% 5.50%    
Notional Amount $ 252,674 $ 2,674    
Borrowing costs $ (386) $ (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 01-28-2020 01-28-2019    
Currency or adjustment index US$ US$    
Payment of interest Semiannual Semiannual    
Repayment Upon maturity Upon maturity    
Effective rate 2.35% 2.75%    
Nominal rate 4.38% 4.38%    
Notional Amount $ 4,648 $ 4,648    
Borrowing costs $ (433) $ (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 04-03-2020 04-03-2019    
Currency or adjustment index US$ US$    
Payment of interest Semiannual Semiannual    
Repayment Upon maturity Upon maturity    
Effective rate 1.42% 1.77%    
Nominal rate 3.63% 3.63%    
Notional Amount $ 2,658 $ 2,658    
Borrowing costs $ (614) $ (614)    
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 01-05-2020 01-05-2019    
Currency or adjustment index UF UF    
Payment of interest Semiannual Semiannual    
Repayment Semiannual Semiannual    
Effective rate 1.36% 1.90%    
Nominal rate 4.90% 4.90%    
Notional Amount $ 17,166 $ 3,756    
Borrowing costs $ (139) $ (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 02-01-2020 02-01-2019    
Currency or adjustment index UF UF    
Payment of interest Semiannual Semiannual    
Repayment Upon maturity Upon maturity    
Effective rate 2.41% 2.60%    
Nominal rate 3.80% 3.80%    
Notional Amount $ 890 $ 934    
Borrowing costs $ (67) $ (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 06-01-2020 06-01-2019    
Currency or adjustment index UF UF    
Payment of interest Semiannual Semiannual    
Repayment Upon maturity Upon maturity    
Effective rate 3.11% 3.34% 3.45%  
Nominal rate 3.45% 3.45%    
Notional Amount $ 323 $ 342    
Borrowing costs (6) 0    
Non current bonds issued [Member]        
Financial instruments [Line Items]        
Notional Amount 1,414,192 1,256,274    
Non-current maturities 1,414,192 1,256,274    
Borrowing costs (11,084) (6,795)    
Total 1,403,108 1,249,479    
Non current bonds issued [Member] | Over 1 year to 2 [member]        
Financial instruments [Line Items]        
Notional Amount 13,749 264,428    
Non-current maturities 13,749 264,428    
Non current bonds issued [Member] | Over 2 years to 3 [member]        
Financial instruments [Line Items]        
Notional Amount 13,749 14,428    
Non-current maturities 13,749 14,428    
Non current bonds issued [Member] | Over 3 years to 4 [member]        
Financial instruments [Line Items]        
Notional Amount 313,749 314,428    
Non-current maturities 313,749 314,428    
Non current bonds issued [Member] | Over 4 Years to 5 [Member]        
Financial instruments [Line Items]        
Notional Amount 13,749 14,428    
Non-current maturities 13,749 14,428    
Non current bonds issued [Member] | Over 5 Years [Member]        
Financial instruments [Line Items]        
Notional Amount 1,059,196 648,562    
Non-current maturities $ 1,059,196 $ 648,562    
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 04-21-2020    
Currency or adjustment index US$ US$    
Payment of interest Semiannual Semiannual    
Repayment Upon maturity Upon maturity    
Effective rate 4.08% 5.50%    
Nominal rate 4.38% 5.50%    
Notional Amount $ 250,000 $ 250,000    
Non-current maturities 250,000 250,000    
Borrowing costs (1,514) (131)    
Total 248,486 249,869    
Non current bonds issued [Member] | Single series bond One [Member] | Over 1 year to 2 [member]        
Financial instruments [Line Items]        
Notional Amount 0 250,000    
Non-current maturities 0 250,000    
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 0 0    
Non-current maturities 0 0    
Non current bonds issued [Member] | Single series bond One [Member] | Over 5 Years [Member]        
Financial instruments [Line Items]        
Notional Amount 250,000 0    
Non-current maturities $ 250,000 $ 0    
Non current bonds issued [Member] | 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 04-03-2023 01-28-2025    
Currency or adjustment index US$ US$    
Payment of interest Semiannual Semiannual    
Repayment Upon maturity Upon maturity    
Effective rate 3.43% 4.38%    
Nominal rate 3.63% 4.38%    
Notional Amount $ 300,000 $ 250,000    
Non-current maturities 300,000 250,000    
Borrowing costs (1,393) (2,202)    
Total 298,607 247,798    
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 0 0    
Non-current maturities 0 0    
Non current bonds issued [Member] | Single series bond Two [Member] | Over 3 years to 4 [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 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 0 250,000    
Non-current maturities $ 0 $ 250,000    
Non current bonds issued [Member] | 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 05-07-2029 04-03-2023    
Currency or adjustment index US$ US$    
Payment of interest Semiannual Semiannual    
Repayment Upon maturity Upon maturity    
Effective rate 4.19% 3.63%    
Nominal rate 4.25% 3.63%    
Notional Amount $ 450,000 $ 300,000    
Non-current maturities 450,000 300,000    
Borrowing costs (5,923) (2,006)    
Total 444,077 297,994    
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 0 300,000    
Non-current maturities 0 300,000    
Non current bonds issued [Member] | Single series bond Three [Member] | Over 4 Years to 5 [Member]        
Financial instruments [Line Items]        
Notional Amount   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 0    
Non-current maturities $ 450,000 $ 0    
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 4.78% 4.90%    
Nominal rate 4.90% 4.90%    
Notional Amount $ 130,617 $ 158,704    
Non-current maturities 130,617 158,704    
Borrowing costs (1,253) (1,392)    
Total 129,364 157,312    
Non current bonds issued [Member] | Series H bonds [Member] | Over 1 year to 2 [member]        
Financial instruments [Line Items]        
Notional Amount 13,749 14,428    
Non-current maturities 13,749 14,428    
Non current bonds issued [Member] | Series H bonds [Member] | Over 2 years to 3 [member]        
Financial instruments [Line Items]        
Notional Amount 13,749 14,428    
Non-current maturities 13,749 14,428    
Non current bonds issued [Member] | Series H bonds [Member] | Over 3 years to 4 [member]        
Financial instruments [Line Items]        
Notional Amount 13,749 14,428    
Non-current maturities 13,749 14,428    
Non current bonds issued [Member] | Series H bonds [Member] | Over 4 Years to 5 [Member]        
Financial instruments [Line Items]        
Notional Amount 13,749 14,428    
Non-current maturities 13,749 14,428    
Non current bonds issued [Member] | Series H bonds [Member] | Over 5 Years [Member]        
Financial instruments [Line Items]        
Notional Amount 75,621 100,992    
Non-current maturities $ 75,621 $ 100,992    
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 3.70% 3.80%    
Nominal rate 5.50% 5.50%    
Notional Amount $ 56,715 $ 59,514    
Non-current maturities 56,715 59,514    
Borrowing costs (811) (878)    
Total 55,904 58,636    
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 56,715 59,514    
Non-current maturities $ 56,715 $ 59,514    
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% 3.25%    
Nominal rate 3.25% 3.25%    
Notional Amount $ 113,430 $ 119,028    
Non-current maturities 113,430 119,028    
Borrowing costs (89) (101)    
Total 113,341 118,927    
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 113,430 119,028    
Non-current maturities $ 113,430 $ 119,028    
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 3.45% 3.45%    
Nominal rate 3.45% 3.45%    
Notional Amount $ 113,430 $ 119,028    
Non-current maturities 113,430 119,028    
Borrowing costs (101) (85)    
Total 113,329 118,943    
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 113,430 119,028    
Non-current maturities $ 113,430 $ 119,028