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Equity-accounted investees (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Equity-accounted investees [Line Items]        
Investments accounted for using equity method   $ 111,549 $ 152,630 $ 133,140
Share in profit (loss) of associates and joint ventures accounted for using the equity method   5,081 13,004 10,192
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax   (1,177) 26 2,845
Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax $ 3,904   13,030 10,776
Sales de Magnesio Ltda.        
Equity-accounted investees [Line Items]        
Investments accounted for using equity method   0 0  
Share in profit (loss) of associates and joint ventures accounted for using the equity method   0 0 514
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax   0 0  
Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax 0   0 514
Abu Dhabi Fertilizer Industries WWL        
Equity-accounted investees [Line Items]        
Investments accounted for using equity method   10,821 15,936  
Share in profit (loss) of associates and joint ventures accounted for using the equity method   596 1,483 1,482
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax   0 0  
Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax 596   1,483 1,482
Doktor Tarsa Tarim Sanayi AS        
Equity-accounted investees [Line Items]        
Investments accounted for using equity method   21,582 21,788  
Share in profit (loss) of associates and joint ventures accounted for using the equity method   241 6,427 4,026
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax   489 0  
Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax 730   6,427 4,616
Ajay North America        
Equity-accounted investees [Line Items]        
Investments accounted for using equity method   14,951 14,432  
Share in profit (loss) of associates and joint ventures accounted for using the equity method   3,728 3,677 2,794
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax   0 0  
Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax 3,728   3,677 2,794
Ajay Europe SARL        
Equity-accounted investees [Line Items]        
Investments accounted for using equity method   7,845 8,144  
Share in profit (loss) of associates and joint ventures accounted for using the equity method   1,373 1,049 1,132
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax   (439) 26  
Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax 934   1,075 1,126
Charlee SQM Thailand Co, Ltd,        
Equity-accounted investees [Line Items]        
Investments accounted for using equity method   0 2,301  
Share in profit (loss) of associates and joint ventures accounted for using the equity method   316 393 244
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax   0 0  
Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax 316   393 244
SQM Eastmed Turkey,        
Equity-accounted investees [Line Items]        
Investments accounted for using equity method   310 0  
Share in profit (loss) of associates and joint ventures accounted for using the equity method   370 (25) 0
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax   (21) 0  
Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax 349   (25) 0
Kore Potash Ltd        
Equity-accounted investees [Line Items]        
Investments accounted for using equity method   20,467 20,000  
Share in profit (loss) of associates and joint ventures accounted for using the equity method   (1,543) 0 0
Share of other comprehensive income of associates and joint ventures accounted for using equity method, net of tax   $ (1,206) 0  
Share of other comprehensive income of associates and joint ventures accounted for using equity method, before tax $ (2,749)   $ 0 $ 0