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Joint Ventures (Details Textual)
$ in Thousands, in Thousands
 1 Months Ended 12 Months Ended
May 15, 2018
USD ($)
Dec. 01, 2017
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
MT
Dec. 31, 2016
USD ($)
Apr. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Oct. 06, 2017
USD ($)
Oct. 06, 2017
CLF ( )
Percentage of voting equity interests acquired       50.00%          
Other cash payments to acquire interests in joint ventures, classified as investing activities     $ 19,989 $ 38,088 $ 45,000        
Volume of lithium metallic equivalent authorised to process and sell | MT       45,000          
Payments for development project expenditure       $ 7,500          
Contingent Consideration Initial Payment       15,000          
Payments Of Deferrred Contingent Consideration       30,000          
Amounts recognised for transaction recognised separately from acquisition of assets and assumption of liabilities in business combination       10,000          
Contingent Consideration Deferred Payment       55,000          
Kidman [Member]                  
Capital commitments       37,500          
Payments for development project expenditure       7,500          
Minera Exar S.A. [Member]                  
Percentage of voting equity interests acquired   50.00%              
Other cash payments to acquire interests in joint ventures, classified as investing activities   $ 6,205              
Gain (loss) that relates to identifiable assets acquired or liabilities assumed in business combination and is of such size, nature or incidence that disclosure is relevant to understanding combined entity's financial statements     14,507            
Capital contributions made by related entities           $ 7,000 $ 13,000 $ 13,300 2,304,225
Percentage of interest held by other entities               50.00% 50.00%
SQM Potasio S.A. [Member]                  
Impairment loss     8,802            
Pavoni C Spa [Member]                  
Acquisitions through business combinations, intangible assets and goodwill     $ 3,206            
SQM Australia Pty [Member]                  
Consideration transferred, acquisition-date fair value       $ 70,000          
Soquimich European Holding B.V. [Member]                  
Percentage of voting equity interests acquired 50.00%                
Other cash payments to acquire interests in joint ventures, classified as investing activities $ 6,800