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Joint Ventures (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement [Line Items]        
Cash and cash equivalents $ 588,530 $ 556,066 $ 630,438 $ 514,669
Other current financial liabilities 298,822 23,585    
Other non-current financial liabilities 1,518,926 1,330,382    
Depreciation and amortisation expense (202,264) (220,827) (240,526)  
Interest Expense (76,939) (57,807) (50,124)  
Sichuan SQM Migao Chemical Fertilizers Co Ltda. [Member]        
Statement [Line Items]        
Cash and cash equivalents 33 106    
Other current financial liabilities 0 0    
Other non-current financial liabilities 0 0    
Depreciation and amortisation expense (743) (948) (691)  
Interest Expense 0 (1) (433)  
Income Tax Expense (Benefit) 153 97 200  
Coromandel SQM India [Member]        
Statement [Line Items]        
Cash and cash equivalents 2,240 308    
Other current financial liabilities 0 0    
Other non-current financial liabilities 0 0    
Depreciation and amortisation expense   (445) 0  
Depreciation and amortisation expense (291)      
Interest Expense (4) (9) (49)  
Income Tax Expense (Benefit) (27) (38) (44)  
SQM Vitas Fzco. [Member]        
Statement [Line Items]        
Cash and cash equivalents 3,071 19,312    
Other current financial liabilities 0 0    
Other non-current financial liabilities 0 0    
Depreciation and amortisation expense 0 (509) (717)  
Interest Expense (7) (8) (16)  
Income Tax Expense (Benefit) 0 0 0  
SQM Star Qingdao Corp Nutrition Co., Ltd. [Member]        
Statement [Line Items]        
Cash and cash equivalents 4,640 4,543    
Other current financial liabilities 0 0    
Other non-current financial liabilities 0 0    
Depreciation and amortisation expense (62) (67) (64)  
Interest Expense 0 0 (1)  
Income Tax Expense (Benefit) (241) (187) (195)  
SQM Vitas Brazil Agroindustria [Member]        
Statement [Line Items]        
Cash and cash equivalents 2,101 1,869    
Other current financial liabilities 9,106 13,380    
Other non-current financial liabilities 0 0    
Depreciation and amortisation expense (33) (408) (438)  
Interest Expense (1,176) (886) (2,127)  
Income Tax Expense (Benefit) 181 (117) 0  
SQM Vitas Peru S.A.C. [Member]        
Statement [Line Items]        
Cash and cash equivalents 225 371    
Other current financial liabilities 258 3,819    
Other non-current financial liabilities 895 801    
Depreciation and amortisation expense (287) (347) (82)  
Interest Expense (435) (425)  
Income Tax Expense (Benefit) (316) (230) (362)  
SQM Vitas Plantacote B.V [Member]        
Statement [Line Items]        
Depreciation and amortisation expense 0 0 0  
Interest Expense 0 0  
Income Tax Expense (Benefit) 0 0 0  
SQM Vitas Holland B.V. [Member]        
Statement [Line Items]        
Cash and cash equivalents 2,609 2,692    
Other current financial liabilities 0 0    
Other non-current financial liabilities 0 0    
Depreciation and amortisation expense 0 0 0  
Interest Expense (1) 0 0  
Income Tax Expense (Benefit) 0 0 (337)  
Joint ventures [member]        
Statement [Line Items]        
Cash and cash equivalents 15,926 29,764    
Other current financial liabilities 15,345 22,663    
Other non-current financial liabilities 895 801    
Depreciation and amortisation expense (1,691) (2,392) (1,992)  
Interest Expense (1,655) (1,669) (2,950)  
Income Tax Expense (Benefit) (464) (521) (738)  
Pavoni C Spa [Member]        
Statement [Line Items]        
Cash and cash equivalents 314 407    
Other current financial liabilities 5,509 5,464    
Other non-current financial liabilities 0 0    
Depreciation and amortisation expense (149) (542) 0  
Interest Expense 0 (335) 0  
Income Tax Expense (Benefit) (214) 0 0  
Covalent Lithium Pty Ltd [Member]        
Statement [Line Items]        
Cash and cash equivalents 693 156    
Other current financial liabilities 472 0    
Other non-current financial liabilities 0 0    
Depreciation and amortisation expense (126) (16) 0  
Interest Expense (32) (5) 0  
Income Tax Expense (Benefit) $ 0 $ (46) $ 0