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Financial instruments (Details 7) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financial instruments [Line Items] |  |  |
Effect on profit or loss for the period Derivative instruments | $ 0 | $ (229,000) | $ 1,062,000
Debt [Member] | Cross currency swap contracts [Member] |  |  |
Financial instruments [Line Items] |  |  |
Derivative instruments | 17,128,000 | 43,235,000 | 74,786
Effect on profit or loss for the period Derivative instruments | 33,696,000 | 28,108,000 | (29,245)
Hedging reserve in gross equity | 41,000 | (29,000) | 86,000
Deferred tax hedging reserve in equity | 0 | 5,000 | 96,000
Hedging reserve in equity | 41,000 | (24,000) | $ 182,000
Debt [Member] | Forward contract [member] |  |  |
Financial instruments [Line Items] |  |  |
Derivative instruments | 8,910,000 | 830,000 |
Effect on profit or loss for the period Derivative instruments | 5,641,000 | 789,000 |
Hedging reserve in gross equity | 2,170,000 | 41,000 |
Deferred tax hedging reserve in equity | 0 | (9,000) |
Hedging reserve in equity | 2,170,000 | 32,000 |
Investments [Member] | Cross currency swap contracts [Member] |  |  |
Financial instruments [Line Items] |  |  |
Derivative instruments | (20,159,000) | 218,000 |
Effect on profit or loss for the period Derivative instruments | (20,256,000) | (294,000) |
Hedging reserve in gross equity | 97,000 | 76,000 |
Deferred tax hedging reserve in equity | 0 | (19,000) |
Hedging reserve in equity | $ 97,000 | $ 57,000 |

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- Definition The gains (losses) on hedging instruments in fair value hedges. [Refer: Fair value hedges [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24 -Subparagraph a -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-02&anchor=para_24_a_i&doctype=Standard&book=B -URIDate 2017-03-09 + Details
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Period Type: | duration

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- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 24A -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_24A_a&doctype=Standard -URIDate 2017-03-09 + Details
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- References No definition available. + Details
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Namespace Prefix: | sqm_
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- Definition A component of equity representing the hedging reserve. + References No definition available. + Details
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- Definition A component of gross equity representing the hedging reserve. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition A component of equity representing the reserve of deffered tax hedging. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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