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Joint Ventures (Details 3) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Cash and cash equivalents   $ 556,066 $ 630,438 $ 514,669 $ 527,259
Other current financial liabilities   23,585 220,328    
Other non-current financial liabilities   1,330,382 1,031,507    
Depreciation and amortisation expense   (221,499) (240,526) (249,792)  
Interest Expense $ (50,124) (59,914) (50,124) (57,498)  
Sichuan SQM Migao Chemical Fertilizers Co Ltda. [Member]          
Cash and cash equivalents   106 6,198    
Other current financial liabilities   0 0    
Other non-current financial liabilities   0 0    
Depreciation and amortisation expense   (948) (696) (691)  
Interest Expense   (1) (25) (433)  
Income Tax Expense (Benefit)   97 303 200  
Coromandel SQM India [Member]          
Cash and cash equivalents   308 1,118    
Other current financial liabilities   0 0    
Other non-current financial liabilities   0 0    
Depreciation and amortisation expense     0 0  
Depreciation and amortisation expense   445      
Interest Expense   (9) (16) (49)  
Income Tax Expense (Benefit)   (38) (485) (44)  
SQM Vitas Fzco. [Member]          
Cash and cash equivalents   19,312 15,307    
Other current financial liabilities   0 0    
Other non-current financial liabilities   0 0    
Depreciation and amortisation expense   (509) (553) (717)  
Interest Expense   (8) (19) (16)  
Income Tax Expense (Benefit)   0 0 0  
SQM Star Qingdao Corp Nutrition Co., Ltd. [Member]          
Cash and cash equivalents   4,543 3,675    
Other current financial liabilities   0 0    
Other non-current financial liabilities   0 0    
Depreciation and amortisation expense   (67) (68) (64)  
Interest Expense   0 0 (1)  
Income Tax Expense (Benefit)   (187) (174) (195)  
SQM Vitas Brazil Agroindustria [Member]          
Cash and cash equivalents   1,869 5,139    
Other current financial liabilities   13,380 7,342    
Other non-current financial liabilities   0 0    
Depreciation and amortisation expense   (408) (453) (438)  
Interest Expense   (886) (1,253) (2,127)  
Income Tax Expense (Benefit)   (117) (283) (337)  
SQM Vitas Peru S.A.C. [Member]          
Cash and cash equivalents   371 687    
Other current financial liabilities   3,819 2,215    
Other non-current financial liabilities   801 1,372    
Depreciation and amortisation expense   (347) (375) (82)  
Interest Expense   (425) (432)  
Income Tax Expense (Benefit)   (230) (214) (362)  
SQM Vitas Plantacote B.V [Member]          
Cash and cash equivalents   0 679    
Other current financial liabilities   0 0    
Other non-current financial liabilities   0 0    
Depreciation and amortisation expense   0 0 0  
Interest Expense   0 (1)  
Income Tax Expense (Benefit)   0 0 0  
SQM Vitas Holland B.V. [Member]          
Cash and cash equivalents   2,692 2,190    
Other current financial liabilities   0 0    
Other non-current financial liabilities   0 0    
Depreciation and amortisation expense   0 0 0  
Interest Expense   0 0 0  
Income Tax Expense (Benefit)   0 0 0  
Miera Exar S.A. [Member]          
Cash and cash equivalents   0 9,189    
Other current financial liabilities   0 0    
Other non-current financial liabilities   0    
Depreciation and amortisation expense   0 (523) 0  
Interest Expense   0 (32) 0  
Income Tax Expense (Benefit)   0 (620) 0  
Joint ventures [member]          
Cash and cash equivalents   29,764 44,182    
Other current financial liabilities   22,663 9,557    
Other non-current financial liabilities   801 1,372    
Depreciation and amortisation expense   (2,392) (2,668) (1,992)  
Interest Expense   (1,669) (1,778) (2,950)  
Income Tax Expense (Benefit)   (521) (1,473) (738)  
Pavoni C Spa [Member]          
Cash and cash equivalents   407 0    
Other current financial liabilities   5,464 0    
Other non-current financial liabilities   0 0    
Depreciation and amortisation expense   (542) 0 0  
Interest Expense   (335) 0 0  
Income Tax Expense (Benefit)   0 0 0  
Arpa Speciali SRL [Member]          
Cash and cash equivalents   0 0    
Other current financial liabilities   0 0    
Other non-current financial liabilities   0 0    
Depreciation and amortisation expense   0 0 0  
Interest Expense   0 0 0  
Income Tax Expense (Benefit)   0 0 0  
Covalent Lithium Pty Ltd [Member]          
Cash and cash equivalents   156 0    
Other current financial liabilities   0 0    
Other non-current financial liabilities   0 0    
Depreciation and amortisation expense   (16) 0 0  
Interest Expense   (5) 0 0  
Income Tax Expense (Benefit)   $ (46) $ 0 $ 0