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Long-term debt - Narrative (Detail) |  |  |  |  | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jul. 12, 2019 CAD ($) | Jul. 01, 2019 USD ($) | May 23, 2019 USD ($) | Oct. 17, 2018 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Feb. 24, 2020 USD ($) | Feb. 14, 2020 CAD ($) | Dec. 31, 2019 CAD ($) | Oct. 24, 2019 USD ($) | Jul. 12, 2019 USD ($) | Jun. 27, 2019 USD ($) | Jan. 29, 2019 CAD ($) | Jul. 25, 2018 CAD ($) | Mar. 07, 2018 USD ($) | Feb. 23, 2018 USD ($) | Feb. 16, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt |  |  |  |  | $ 377,015,000 |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 3,931,868,000 | $ 3,336,795,000 |  |  |  |  |  |  |  |  |  |  |
Interest on long term debt |  |  |  |  | 44,229,000 | 33,822,000 |  |  |  |  |  |  |  |  |  |  |
Interest expense during the year on long-term liabilities |  |  |  |  | 175,664,000 | 146,310,000 |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | U.S. Dollar Subordinated Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  | $ 350,000,000 | $ 287,500 | $ 637,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Weighted average coupon |  |  |  | 6.875% | 6.50% |  |  |  | 6.50% |  |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 621,049,000 | 278,771,000 |  |  |  |  |  |  |  |  |  |  |
Senior Unsecured Notes | Senior Unsecured Debenture Due February 2027 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 135,000,000 |  |  |
Senior Unsecured Notes | Senior Unsecured Notes Due January 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  |  |  |  |  |  | $ 300,000,000 |  |  |  |
Weighted average coupon |  |  |  |  |  |  |  |  |  |  |  |  | 4.60% |  |  |  |
Debt at issuance price per C$100 |  |  |  |  |  |  |  |  |  |  |  |  | $ 99.952 |  |  |  |
Debt instrument, sales price ratio |  |  |  |  | 0.99952 |  |  |  | 0.99952 |  |  |  |  |  |  |  |
Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  | $ 135,000,000 |  |  |  |  |  |  |  |
Revolving Credit Facility | Senior Unsecured Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  |  |  | $ 75,000,000 | $ 500,000,000 |  |  |  |  |  |
Credit facility, amount canceled | $ 165,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Commercial Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum maturity of amounts drawn under the commercial paper program |  | 270 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Senior Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average coupon |  |  |  |  | 0.00% |  |  |  | 0.00% |  |  |  |  |  |  |  |
Revolving Credit Facility | Senior Unsecured Notes | Senior Unsecured Revolving Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000 |
Long-term debt |  |  |  |  | $ 141,577,000 | 97,000,000 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Senior Unsecured Notes | Algonquin Power Senior Unsecured Revolving Facility Maturing July 2019 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000,000 |  | $ 200,000,000
Revolving Credit Facility | Senior Unsecured Notes | Senior Unsecured Bank Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 75,000,000 | 321,807,000 |  |  |  |  |  |  |  |  |  |  |
Revolving Credit Facility | Senior Unsecured Notes | Commercial Paper |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 218,000,000 | $ 6,000,000 |  |  |  |  |  |  |  |  |  |  |
Line of Credit | Senior Unsecured Bank Credit Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | $ 135,000,000 |  |  |  |  |
Repayment of debt |  |  | $ 186,807,000 |  | $ 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Reset, Period One | Senior Unsecured Notes | U.S. Dollar Subordinated Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 4.01% | 3.677% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Reset, Period Two | Senior Unsecured Notes | U.S. Dollar Subordinated Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 4.26% | 3.927% |  |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate Reset, Period Three | Senior Unsecured Notes | U.S. Dollar Subordinated Unsecured Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  | 5.01% | 4.677% |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Senior Unsecured Notes | Senior Unsecured Debentures Due February 2050 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Par value |  |  |  |  |  |  |  | $ 200,000,000 |  |  |  |  |  |  |  |  |
Weighted average coupon |  |  |  |  |  |  |  | 3.315% |  |  |  |  |  |  |  |  |
Subsequent Event | Revolving Credit Facility | Senior Unsecured Notes | Algonquin Power Senior Unsecured Revolving Facility Maturing June 2021 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  | $ 350,000,000 |  |  |  |  |  |  |  |  |  |

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