Related Party Transactions and Balances - Summary of Key Management Personnel (Parenthetical) (Detail) - CAD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Disclosure of transactions between related parties [abstract] | ||
| Stock-based compensation, shares issued in lieu of compensation | $ 0 | $ 129 |
| Stock-based compensation, issued to key management | $ 899 | $ 79 |