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Shareholder's capital - Share-Based Compensation Expense (Detail) - CAD CAD in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Share-based compensation expense	CAD 10,804	CAD 5,675
Share options
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Share-based compensation expense	3,990	3,006
Directors deferred share units
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Share-based compensation expense	771	683
Employee share purchase
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Share-based compensation expense	568	238
Performance share units
Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]
Share-based compensation expense	CAD 5,475	CAD 1,748

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- Definition

Schedule Of Employee Service Share Based Compensation Expense Allocation [Line Items]

+ References

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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