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Financial instruments (Details 11) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Apr. 05, 2018
Financial instruments [Line Items]      
Effective rate     3.25%
Notional amounts $ 290,397,000 $ 95,623,000  
Current amounts (177,062,000) (160,243,000)  
Borrowing costs (1,639,000) (9,886,000)  
Bank borrowings [Member]      
Financial instruments [Line Items]      
Notional amounts 163,000,000 100,412,000  
Current amounts 163,568,000 101,270  
Borrowing costs 0 0  
Total 163,568,000 101,270,000  
Bank borrowings [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 63,000,000 20,000,000  
Current amounts 63,059,000 20,242,000  
Bank borrowings [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 100,000,000 80,412,000  
Current amounts $ 100,509,000 $ 81,028,000  
Bank borrowing 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  
Tax ID No. 97,018,000-1 97,018,000-1  
Financial institution Scotiabank Sud Americano Scotiabank Sud Americano  
Country Chile Chile  
Currency or adjustment index US$ US$  
Repayment Upon maturity Upon maturity  
Effective rate 1.63% 1.00%  
Nominal rate 1.63% 1.00%  
Notional amounts $ 20,000,000 $ 20,000,000  
Current amounts 20,137,000 20,030,000  
Borrowing costs 0 0  
Total 20,137,000 20,030,000  
Bank borrowing One [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 0 0  
Current amounts 0 30,000  
Bank borrowing One [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 20,000,000 20,000,000  
Current amounts $ 20,137,000 $ 20,000,000  
Bank borrowing 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  
Tax ID No. 97,018,000-1 97,030,000-7  
Financial institution Scotiabank Sud Americano Banco Estado  
Country Chile Chile  
Currency or adjustment index US$ US$  
Repayment Upon maturity Upon maturity  
Effective rate 1.73% 4.30%  
Nominal rate 1.73% 4.30%  
Notional amounts $ 17,000,000 $ 20,412,000  
Current amounts 17,140,000 20,919,000  
Borrowing costs 0 0  
Total 17,140,000 20,919,000  
Bank borrowing Two [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 0 0  
Current amounts 0 0  
Bank borrowing Two [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 17,000,000 20,412,000  
Current amounts $ 17,140,000 $ 20,919,000  
Bank borrowing 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  
Tax ID No. 97,018,000-1 97,018,000-1  
Financial institution Scotiabank Sud Americano Scotiabank Sud Americano  
Country Chile Chile  
Currency or adjustment index US$ US$  
Repayment Upon maturity Upon maturity  
Effective rate 1.73% 0.74%  
Nominal rate 1.73% 0.85%  
Notional amounts $ 3,000,000 $ 17,000,000  
Current amounts 3,025,000 17,057,000  
Borrowing costs 0 0  
Total 3,025,000 17,057,000  
Bank borrowing Three [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 0 0  
Current amounts 0 0  
Bank borrowing Three [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 3,000,000 17,000,000  
Current amounts $ 3,025,000 $ 17,057,000  
Bank borrowing 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  
Tax ID No. 97,018,000-1 97,018,000-1  
Financial institution Banco Estado Scotiabank Sud Americano  
Country Chile Chile  
Currency or adjustment index US$ US$  
Repayment Upon maturity Upon maturity  
Effective rate 1.64% 0.74%  
Nominal rate 1.64% 0.84%  
Notional amounts $ 15,000,000 $ 3,000,000  
Current amounts 15,011,000 3,010,000  
Borrowing costs 0 0  
Total 15,011,000 3,010,000  
Bank borrowing Four [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 15,000,000 0  
Current amounts 15,011,000 0  
Bank borrowing Four [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 0 3,000,000  
Current amounts $ 0 $ 3,010,000  
Bank borrowing Five [Member]      
Financial instruments [Line Items]      
Tax ID No. 93,007,000-9 79,626,800-K  
Company SQM S.A. SQM Salar S.A.  
Country Chile Chile  
Tax ID No. 97,018,000-1 97,018,000-1  
Financial institution Banco Estado Scotiabank Sud Americano  
Country Chile Chile  
Currency or adjustment index US$ US$  
Repayment Upon maturity Upon maturity  
Effective rate 1.67% 1.34%  
Nominal rate 1.67% 0.84%  
Notional amounts $ 15,000,000 $ 20,000,000  
Current amounts 15,011,000 20,042,000  
Borrowing costs 0 0  
Total 15,011,000 20,042,000  
Bank borrowing Five [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 15,000,000 0  
Current amounts 15,011,000 0  
Bank borrowing Five [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 0 20,000,000  
Current amounts $ 0 $ 20,042,000  
Bank borrowing Six [Member]      
Financial instruments [Line Items]      
Tax ID No. 93,007,000-9 79,947,100-0  
Company SQM S.A. SQM Industrial S.A.  
Country Chile Chile  
Tax ID No. 97,018,000-1 97,030,000-7  
Financial institution Banco Estado Banco Estado  
Country Chile Chile  
Currency or adjustment index US$ US$  
Repayment Upon maturity Upon maturity  
Effective rate 1.67% 1.20%  
Nominal rate 1.67% 1.20%  
Notional amounts $ 15,000,000 $ 20,000,000  
Current amounts 15,011,000 20,212,000  
Borrowing costs 0 0  
Total 15,011,000 20,212,000  
Bank borrowing Six [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 15,000,000 20,000,000  
Current amounts 15,011,000 20,212,000  
Bank borrowing Six [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 0 0  
Current amounts $ 0 $ 0  
Bank borrowing Seven [Member]      
Financial instruments [Line Items]      
Tax ID No. 79,626,800-K    
Company SQM Salar S.A.    
Country Chile    
Tax ID No. 97,018,000-1    
Financial institution Banco Estado    
Country Chile    
Currency or adjustment index US$    
Repayment Upon maturity    
Effective rate 1.91%    
Nominal rate 1.91%    
Notional amounts $ 20,000,000    
Current amounts 20,071,000    
Borrowing costs 0    
Total 20,071,000    
Bank borrowing Seven [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts 0    
Bank borrowing Seven [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 20,000,000    
Current amounts $ 20,071,000    
Bank borrowing Eight [Member]      
Financial instruments [Line Items]      
Tax ID No. 79,626,800-K    
Company SQM Salar S.A.    
Country Chile    
Tax ID No. 97,018,000-1    
Financial institution Scotiabank Sud Americano    
Country Chile    
Currency or adjustment index US$    
Repayment Upon maturity    
Effective rate 1.94%    
Nominal rate 1.94%    
Notional amounts $ 20,000,000    
Current amounts 20,072,000    
Borrowing costs 0    
Total 20,072,000    
Bank borrowing Eight [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts 0    
Bank borrowing Eight [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 20,000,000    
Current amounts $ 20,072,000    
Bank borrowing Nine [Member]      
Financial instruments [Line Items]      
Tax ID No. 79,947,100-0    
Company SQM Industrial S.A.    
Country Chile    
Tax ID No. 97,030,000-7    
Financial institution Banco Estado    
Country Chile    
Currency or adjustment index US$    
Repayment Upon maturity    
Effective rate 1.74%    
Nominal rate 1.74%    
Notional amounts $ 20,000,000    
Current amounts 20,064,000    
Borrowing costs 0    
Total 20,064,000    
Bank borrowing Nine [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts 0    
Bank borrowing Nine [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 20,000,000    
Current amounts $ 20,064,000    
Bank borrowing Ten [Member]      
Financial instruments [Line Items]      
Tax ID No. 79,947,100-0    
Company SQM Industrial S.A.    
Country Chile    
Tax ID No. 97,030,000-7    
Financial institution Banco Estado    
Country Chile    
Currency or adjustment index US$    
Repayment Upon maturity    
Effective rate 1.65%    
Nominal rate 1.65%    
Notional amounts $ 18,000,000    
Current amounts 18,026,000    
Borrowing costs 0    
Total 18,026,000    
Bank borrowing Ten [Member] | Not later than three months [member]      
Financial instruments [Line Items]      
Notional amounts 18,000,000    
Current amounts 18,026,000    
Bank borrowing Ten [Member] | Later than three months and not later than one year [member]      
Financial instruments [Line Items]      
Notional amounts 0    
Current amounts $ 0