Long-Term Debt - Additional Information (Detail) - CAD |
1 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Oct. 31, 2016 |
Aug. 31, 2016 |
Sep. 30, 2016 |
Jul. 31, 2015 |
|
| Line of Credit Facility [Line Items] | ||||
| Long-term capital lease obligation | CAD 480,000,000 | |||
| Revolving demand loan | ||||
| Line of Credit Facility [Line Items] | ||||
| Debt instrument, maturity date | Oct. 31, 2017 | |||
| Line of credit maximum borrowing capacity | CAD 500,000,000 | CAD 500,000,000 | ||
| Revolving demand loan | Subsequent Event | ||||
| Line of Credit Facility [Line Items] | ||||
| Debt instrument, maturity date | Nov. 30, 2018 | |||
| Line of credit maximum borrowing capacity | CAD 250,000,000 | |||
| Floating Rate Loan Facility | Exxon Mobil | ||||
| Line of Credit Facility [Line Items] | ||||
| Decrease in long-term debt drawn from credit facility | CAD 495,000,000 | |||