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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

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- Definition The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 24 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_24_a&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B16 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B16&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_e&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, net of tax. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2018-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=4&date=2018-03-02&anchor=para_39M_b&doctype=Standard&book=b -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B16 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B16_c&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The entity's share of the other comprehensive income of associates and joint ventures accounted for using the equity method, before tax. [Refer: Associates [member]; Investments accounted for using equity method; Joint ventures [member]; Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective on first application of IFRS 9 -Name IFRS -Number 4 -IssueDate 2018-01-01 -Paragraph 39M -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=4&date=2018-03-02&anchor=para_39M_b&doctype=Standard&book=b -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The entity's share of the profit (loss) from continuing operations of associates and joint ventures accounted for using the equity method. [Refer: Associates [member]; Continuing operations [member]; Investments accounted for using equity method; Joint ventures [member]; Profit (loss) from continuing operations] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B16 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B16_a&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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