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Summary of Per Share Amounts (Detail) - CAD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Weighted Average Shares And Adjusted Weighted Average Shares [Abstract]    
Net earnings (loss) for the period $ 6,618 $ (294,270)
Weighted average shares outstanding – basic 290,782 293,560
Effect of stock options and other equity compensation plans 6,397 0
Weighted average shares outstanding – diluted 297,179 293,560