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Joint Ventures (Details 2) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Current assets $ 2,569,258 $ 2,682,166  
Long-Lived Assets 2,249,205 2,001,985  
Current liabilities 475,882 776,812  
Non-current liabilities 2,180,003 1,772,867  
Revenue 1,817,191 1,943,655 $ 2,265,803
Profit (loss) from continuing operations 168,359 280,603 442,063
Other comprehensive income 19,266 (1,755) (486)
Comprehensive income 187,625 278,848 441,577
Sichuan SQM Migao Chemical Fertilizers Co Ltda. [Member]      
Statement [Line Items]      
Current assets 29,507 28,668 28,577
Long-Lived Assets 4,412 5,129 5,913
Current liabilities 14,156 13,472 12,902
Non-current liabilities 0 0 0
Revenue 9 7 16
Profit (loss) from continuing operations (562) (1,262) (1,301)
Other comprehensive income 0 0 0
Comprehensive income (562) (1,262) (1,301)
Coromandel SQM India [Member]      
Statement [Line Items]      
Current assets 0 4,504 5,905
Long-Lived Assets 0 633 852
Current liabilities 0 1,704 3,050
Non-current liabilities 0 0 0
Revenue 0 8,197 11,605
Profit (loss) from continuing operations 0 (197) 348
Other comprehensive income 0 (77) (318)
Comprehensive income 0 (274) 30
SQM Vitas Fzco. [Member]      
Statement [Line Items]      
Current assets (496) 9,695 30,430
Long-Lived Assets 20,431 1 17,592
Current liabilities 496 1,136 2,678
Non-current liabilities 0 0 0
Revenue 0 36 16,583
Profit (loss) from continuing operations 4,019 3,595 3,561
Other comprehensive income 0 (876) (1,806)
Comprehensive income 4,019 2,719 1,755
SQM Star Qingdao Corp Nutrition Co., Ltd. [Member]      
Statement [Line Items]      
Current assets 0 7,534 7,754
Long-Lived Assets 0 26 114
Current liabilities 0 632 1,533
Non-current liabilities 0 0 0
Revenue 0 12,003 13,004
Profit (loss) from continuing operations 0 592 377
Other comprehensive income 0 0 0
Comprehensive income 0 592 377
SQM Vitas Brazil Agroindustria [Member]      
Statement [Line Items]      
Current assets 40,064 46,118 36,648
Long-Lived Assets 5,527 7,299 7,566
Current liabilities 33,410 40,334 31,808
Non-current liabilities 0 0 0
Revenue 78,960 87,901 82,625
Profit (loss) from continuing operations 2,036 1,128 2,879
Other comprehensive income (2,938) (451) (1,585)
Comprehensive income (902) 677 1,294
SQM Vitas Peru S.A.C. [Member]      
Statement [Line Items]      
Current assets 34,548 29,452 22,365
Long-Lived Assets 7,928 8,378 7,785
Current liabilities 33,145 24,855 18,996
Non-current liabilities 1,080 6,044 5,966
Revenue 37,591 28,590 28,619
Profit (loss) from continuing operations 1,319 421 (550)
Other comprehensive income 0 1,322 (223)
Comprehensive income 1,319 1,743 (773)
SQM Vitas BV [Member]      
Statement [Line Items]      
Current assets   2,609 2,692
Long-Lived Assets   0 0
Current liabilities   2 1
Non-current liabilities   0 0
Revenue   0 0
Profit (loss) from continuing operations   (30) (28)
Other comprehensive income   (53) (139)
Comprehensive income   (83) (167)
Joint ventures [member]      
Statement [Line Items]      
Current assets 115,686 139,640 144,672
Long-Lived Assets 47,922 29,498 46,412
Current liabilities 93,300 92,712 79,299
Non-current liabilities 2,826 7,162 6,664
Revenue 132,518 151,030 167,913
Profit (loss) from continuing operations 6,596 4,318 5,313
Other comprehensive income (2,207) (670) (3,931)
Comprehensive income 4,389 3,648 1,382
Pavoni C Spa [Member]      
Statement [Line Items]      
Current assets 10,645 9,444 10,062
Long-Lived Assets 7,493 7,074 6,490
Current liabilities 9,270 8,466 8,098
Non-current liabilities 836 735 698
Revenue 15,958 14,296 15,461
Profit (loss) from continuing operations 16 71 (79)
Other comprehensive income 698 (510) 140
Comprehensive income 714 (439) 61
Covalent Lithium Pty Ltd [Member]      
Statement [Line Items]      
Current assets 1,418 1,616 239
Long-Lived Assets 2,131 958 100
Current liabilities 2,823 2,111 233
Non-current liabilities 910 383 0
Revenue 0 0 0
Profit (loss) from continuing operations (232) 0 106
Other comprehensive income 33 (25) 0
Comprehensive income $ (199) $ (25) $ 106