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Significant accounting policies (Details)		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019
Brazilian real [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		5.18	4.02
Average foreign exchange rate		5.14	4.11
New Peruvian Sol [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		3.62	3.31
Average foreign exchange rate		3.60	3.35
Argentine peso [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		84.14	59.83
Average foreign exchange rate		82.62	59.86
Japanese yen [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		105.56	108.90
Average foreign exchange rate		103.81	109.12
Euro [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		0.81	0.89
Average foreign exchange rate		0.82	0.90
Mexican peso [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		19.93	18.89
Average foreign exchange rate		19.97	19.11
Australian dollar [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		1.30	1.43
Average foreign exchange rate		1.33	1.45
Pound Sterling [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		0.74	0.76
Average foreign exchange rate		0.74	0.76
South African rand [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		14.61	14.06
Average foreign exchange rate		14.88	14.42
Chilean peso [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		710.95	748.74
Average foreign exchange rate		731.92	767.22
Chinese yuan [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		6.51	6.98
Average foreign exchange rate		6.53	7.01
Indian rupee [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		73.30	71.31
Average foreign exchange rate		73.65	71.16
Thai Baht [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		29.94	29.97
Average foreign exchange rate		30.08	30.22
Turkish lira [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate		7.36	5.94
Average foreign exchange rate		7.70	5.85
Uf [Member]
Significant accounting policies [Line Items]
Closing foreign exchange rate	[1]	40.89	37.81
Average foreign exchange rate	[1]	39.73	36.90
[1] US$ per UF

X

- Definition

The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

+ Details

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Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The spot exchange rate at the end of the reporting period. Exchange rate is the ratio of exchange for two currencies. Spot exchange rate is the exchange rate for immediate delivery.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2020-01-01

+ Details

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Period Type:	instant

X

- References

No definition available.

+ Details

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- Details

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X

- Details

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X

- 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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- 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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Period Type:

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- Details

Name:	ifrs-full_GeographicalAreasAxis=sqm_ThaiBahtMember
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- Details

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- Details

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