Income Taxes - Components of Tax Provision (Recovery) (Detail) - CAD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Major components of tax expense (income) [abstract] | ||
| Current | $ 0 | $ 0 |
| Deferred | 298 | (568) |
| Tax provision (recovery) | $ 298 | $ (568) |