XML 147 R127.htm IDEA: XBRL DOCUMENT
v3.20.4

Financial instruments - Liabilities Mature (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Derivative [Line Items] |  |
Long-term debt obligations | $ 4,534,031 |
Interest on long-term debt | 1,884,209 |
Purchase obligations | 561,690 |
Environmental obligation | 66,133 |
Advances in aid of construction | 79,864 | $ 60,828
Other obligations | 216,261 |
Total obligations | 7,452,598 |
Cross currency swap |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 84,542 |
Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 19,325 |
Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 6,543 |
Due less than 1 year |  |
Derivative [Line Items] |  |
Long-term debt obligations | 334,352 |
Interest on long-term debt | 195,876 |
Purchase obligations | 561,690 |
Environmental obligation | 16,955 |
Advances in aid of construction | 1,236 |
Other obligations | 79,219 |
Total obligations | 1,231,308 |
Due less than 1 year | Cross currency swap |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 37,338 |
Due less than 1 year | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 2,725 |
Due less than 1 year | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 1,917 |
Due 2 to 3 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 821,535 |
Interest on long-term debt | 337,199 |
Purchase obligations | 0 |
Environmental obligation | 26,409 |
Advances in aid of construction | 0 |
Other obligations | 6,601 |
Total obligations | 1,225,856 |
Due 2 to 3 years | Cross currency swap |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 29,999 |
Due 2 to 3 years | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 4,346 |
Due 2 to 3 years | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | (233) |
Due 4 to 5 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 285,600 |
Interest on long-term debt | 267,112 |
Purchase obligations | 0 |
Environmental obligation | 1,251 |
Advances in aid of construction | 0 |
Other obligations | 5,232 |
Total obligations | 584,358 |
Due 4 to 5 years | Cross currency swap |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 19,875 |
Due 4 to 5 years | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 4,369 |
Due 4 to 5 years | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 919 |
Due after 5 years |  |
Derivative [Line Items] |  |
Long-term debt obligations | 3,092,544 |
Interest on long-term debt | 1,084,022 |
Purchase obligations | 0 |
Environmental obligation | 21,518 |
Advances in aid of construction | 78,628 |
Other obligations | 125,209 |
Total obligations | 4,411,076 |
Due after 5 years | Cross currency swap |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | (2,670) |
Due after 5 years | Interest rate swaps |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | 7,885 |
Due after 5 years | Energy derivative and commodity contracts |  |
Derivative [Line Items] |  |
Derivative financial instruments, liabilities | $ 3,940 |

X
- Definition Advances in Aid of Construction + References No definition available. + Details
Name: | aqunf_AdvancesinAidofConstruction
Namespace Prefix: | aqunf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings and long-term debt. + References No definition available. + Details
Name: | aqunf_DebtObligations
Namespace Prefix: | aqunf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Future Interest Payable + References No definition available. + Details
Name: | aqunf_FutureInterestPayable
Namespace Prefix: | aqunf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Other Noncurrent Obligations + References No definition available. + Details
Name: | aqunf_OtherNoncurrentObligations
Namespace Prefix: | aqunf_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of liabilities incurred and payable to vendors for goods and services received, and accrued liabilities classified as other. + References No definition available. + Details
Name: | us-gaap_AccountsPayableAndOtherAccruedLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Undiscounted amount of the accrual for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 5.Y.Q1) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
Name: | us-gaap_AccrualForEnvironmentalLossContingenciesGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
Name: | us-gaap_DerivativeLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of long-term debt and lease obligation, classified as noncurrent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebtAndCapitalLeaseObligations
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

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

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

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=aqunf_PeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=aqunf_PeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=aqunf_PeriodThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=aqunf_PeriodFourMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |