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Income taxes - Summary of Valuation Allowance for Deferred Tax Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Deferred Tax Assets, Valuation Allowance [Roll Forward]
Beginning balance	$ 27,471	$ 29,824
Charged to income tax expense (recovery)	41,702	(118)
Charged (reduction) to OCI	40,613	(1,707)
Reductions to other accounts	(2,203)	(528)
Ending balance	$ 107,583	$ 27,471

X

- Definition

Deferred Tax Assets, Valuation Allowance

+ References

No definition available.

+ Details

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Namespace Prefix:	aqunf_
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Balance Type:	na
Period Type:	duration

X

- Definition

Valuation Allowance Deferred Tax Asset, Charged To Income Tax Expense (Recovery)

+ References

No definition available.

+ Details

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Namespace Prefix:	aqunf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Valuation Allowance Deferred Tax Asset, Reduction To Other Comphrensive Income OCI

+ References

No definition available.

+ Details

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Namespace Prefix:	aqunf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Valuation Allowance Deferred Tax Asset, Reductions To Other Assets

+ References

No definition available.

+ Details

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Namespace Prefix:	aqunf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant