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Long-term debt - Schedule of Long-term Debt (Detail) | Dec. 31, 2017 CAD | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CAD
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Less: current portion | CAD (15,511,000) |  | CAD (10,075,000)
Long-term debt, excluding current portion | 3,847,785,000 |  | 3,903,340,000
Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 3,863,296,000 |  | 3,913,415,000
Less: current portion | (15,511,000) |  | (10,075,000)
Long-term debt, excluding current portion | CAD 3,847,785,000 |  | 3,903,340,000
Senior Unsecured Notes | Canadian Dollar Senior Unsecured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average coupon | 4.61% | 4.61% |
Par value | CAD 785,669,000 |  |
Long-term debt | CAD 781,833,000 |  | 487,389,000
Senior Unsecured Notes | Canadian Dollar Senior Secured Project Notes |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average coupon | 10.27% | 10.27% |
Par value | CAD 33,568,000 |  |
Long-term debt | CAD 33,507,000 |  | 35,600,000
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 | CAD 1,527,726,000 |  | 700,600,000
Senior Unsecured Notes | U.S. Dollar Senior Unsecured Utility Notes |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average coupon | 5.98% | 5.98% |
Par value | $ |  | $ 227,000,000 |
Long-term debt | CAD 309,309,000 |  | 174,206,000
Senior Unsecured Notes | U.S Dollar Senior Secured Utility Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Weighted average coupon | 4.95% | 4.95% |
Par value | $ |  | $ 752,500,000 |
Long-term debt | CAD 969,567,000 |  | 132,551,000
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 (a) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | CAD 65,017,000 |  | 242,947,000
Revolving Credit Facility | Senior Unsecured Notes | Senior Unsecured Bank Credit Facilities (b) |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | 169,343,000 |  | 2,140,122,000
Revolving Credit Facility | Senior Unsecured Notes | Commercial Paper |  |  |
Debt Instrument [Line Items] |  |  |
Long-term debt | CAD 6,994,000 |  | CAD 0

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