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Income taxes - Non Capital Losses Carry Forwards (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
2020 and onwards
Capital Loss Carryforwards [Line Items]
Non-capital loss carryforwards	$ 925,439

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	aqunf_CapitalLossCarryforwardsLineItems
Namespace Prefix:	aqunf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319

+ Details

Name:	us-gaap_OperatingLossCarryforwards
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_TaxCreditCarryforwardAxis=aqunf_ExpireIn2020andOnwardsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: