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Financial instruments - Summary of Commodity Volumes Associated with Derivative Contracts (Detail) | Dec. 31, 2017 MMBTU
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Derivative [Line Items] |
Commodity volumes, Gas | 15,457,678
Swap |
Derivative [Line Items] |
Commodity volumes, Gas | 2,518,812
Options |
Derivative [Line Items] |
Commodity volumes, Gas | 518,866
Forward contracts |
Derivative [Line Items] |
Commodity volumes, Gas | 12,420,000

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- Definition Volume of Energy Commodity Contracts, Natural Gas + References No definition available. + Details
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Namespace Prefix: | aqunf_
Data Type: | num:energyItemType
Balance Type: | na
Period Type: | instant

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForwardContractsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |