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Financial instruments (Details 12) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Financial instruments [Line Items]    
Tax ID No. 96,529,340-k Oman
Country Jordan [1] United States
Notional amount $ 16,796 $ 1,039,755
Non-current maturities 300,000 1,039,755
Borrowing costs (1,651) (8,248)
Total $ 68,870 1,031,507
Bank Borrowings Chilean Tax [Member]    
Financial instruments [Line Items]    
Tax ID No. 93,007,000-9  
Company SQM.S.A.  
Country Chile  
Tax ID No. 0-E  
Financial institution Scotiabank Cayman  
Country USA  
Currency or adjustment index US$  
Repayment Upon maturity  
Effective rate 3.60%  
Nominal rate 3.98%  
Notional amount $ 0  
Borrowing costs 0  
Between 1 year to 2 [member]    
Financial instruments [Line Items]    
Notional amount 0 250,000
Non-current maturities 0 250,000
Between 2 years to 3 [member]    
Financial instruments [Line Items]    
Notional amount 0 0
Non-current maturities 0 $ 0
Between 3 Years to 4 [member]    
Financial instruments [Line Items]    
Notional amount 70,000  
Non-current maturities $ 70,000  
Non current bonds issued [Member] | Bank Borrowings Chilean Tax [Member]    
Financial instruments [Line Items]    
Tax ID No. 93,007,000-9  
Company SQM.S.A.  
Country Chile  
Tax ID No. 0-E  
Financial institution Scotiabank Cayman  
Country USA  
Currency or adjustment index USD  
Repayment Maturity  
Effective rate 3.98%  
Nominal rate 3.98%  
Notional amount $ 70,000  
Non-current maturities 70,000  
Borrowing costs (1,130)  
Total 68,870  
Non current bonds issued [Member] | Between 1 year to 2 [member] | Bank Borrowings Chilean Tax [Member]    
Financial instruments [Line Items]    
Non-current maturities 0  
Non current bonds issued [Member] | Between 2 years to 3 [member] | Bank Borrowings Chilean Tax [Member]    
Financial instruments [Line Items]    
Notional amount 0  
Non-current maturities 0  
Non current bonds issued [Member] | Between 3 Years to 4 [member] | Bank Borrowings Chilean Tax [Member]    
Financial instruments [Line Items]    
Notional amount 70,000  
Non-current maturities $ 70,000  
[1] These Companies are subsidiaries of the joint venture Abu Dhabi Fertilizer Industries WWL