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Summary of Per Share Amounts (Detail) - CAD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Weighted Average Shares And Adjusted Weighted Average Shares [Abstract]
Net loss for the period	$ (132,036)	$ (155,555)
Weighted average shares outstanding – basic	293,239	293,133
Effect of stock options and other equity compensation plans	0	0
Weighted average shares outstanding – diluted	293,239	293,133

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, excluding the components of other comprehensive income. [Refer: Other comprehensive income]

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