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Long-term debt - Schedule of Long-term Debt (Detail) | Jun. 30, 2019 CAD ($) | Jun. 30, 2019 USD ($) | May 23, 2019 USD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($)
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Less: current portion |  | $ (8,429,000) |  |  | $ (13,048,000)
Long-term debt, excluding current portion |  | 3,773,477,000 |  |  | 3,323,747,000
Senior Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Long-term debt |  | 3,781,906,000 |  |  | 3,336,795,000
Less: current portion |  | (8,429,000) |  |  | (13,048,000)
Long-term debt, excluding current portion |  | $ 3,773,477,000 |  |  | 3,323,747,000
Senior Unsecured Notes | U.S. Dollar Senior Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 4.09% | 4.09% |  |  |
Par value |  | $ 1,225,000,000 |  |  |
Long-term debt |  | $ 1,219,124,000 |  |  | 1,218,680,000
Senior Unsecured Notes | U.S. Dollar Senior Unsecured Utility Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 5.99% | 5.99% |  |  |
Par value |  | $ 222,000,000 |  |  |
Long-term debt |  | $ 239,476,000 |  |  | 240,161,000
Senior Unsecured Notes | U.S Dollar Senior Secured Utility Bonds |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 4.75% | 4.75% |  |  |
Par value |  | $ 662,500,000 |  |  |
Long-term debt |  | $ 674,517,000 |  |  | 676,697,000
Senior Unsecured Notes | U.S. Dollar Subordinated Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 6.50% | 6.50% |  |  |
Par value |  | $ 637,500,000 | $ 350,000 |  |
Long-term debt |  | $ 621,458,000 |  |  | 278,771,000
Senior Unsecured Notes | Canadian Dollar Senior Unsecured Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 4.48% | 4.48% |  |  |
Par value | $ 950,669,000 |  |  |  |
Long-term debt | $ 722,901,000 |  |  | $ 474,764,000 |
Senior Unsecured Notes | Canadian Dollar Senior Secured Project Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 10.24% | 10.24% |  |  |
Par value | $ 29,956,000 |  |  |  |
Long-term debt | 22,890,000 |  |  | $ 22,915,000 |
Revolving Credit Facility | Senior Unsecured Revolving Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Par value | $ 165,000,000 |  |  |  |
Revolving Credit Facility | Senior Unsecured Notes | Senior Unsecured Revolving Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 0.00% | 0.00% |  |  |
Long-term debt |  | $ 145,290,000 |  |  | 97,000,000
Revolving Credit Facility | Senior Unsecured Notes | Senior Unsecured Bank Credit Facilities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 0.00% | 0.00% |  |  |
Long-term debt |  | $ 135,000,000 |  |  | 321,807,000
Revolving Credit Facility | Senior Unsecured Notes | Commercial Paper |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average coupon | 0.00% | 0.00% |  |  |
Long-term debt |  | $ 1,250,000 |  |  | $ 6,000,000

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