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Summary of Per Share Amounts (Detail) - CAD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Weighted Average Shares And Adjusted Weighted Average Shares [Abstract]
Net earnings (loss) for the period	$ (120,138)	$ 6,618
Weighted average shares outstanding – basic	13,722	14,539
Effect of share options and other equity compensation plans		320
Weighted average shares outstanding – diluted	13,722	14,859

X

- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The total of income less expenses from continuing and discontinued operations, excluding the components of other comprehensive income. [Refer: Other comprehensive income]

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