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Dividends (Detail) - CAD CAD / shares in Units, CAD in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Dividends [Line Items]
Dividend declared for common share holders	CAD 242,509	CAD 149,158
Cash dividend declared per common share (CAD per share)	CAD 0.6084	CAD 0.5452
Series A Preferred Stock
Dividends [Line Items]
Dividends declared for preferred share holders	CAD 5,400	CAD 5,400
Dividend declared per preferred share (CAD per share)	CAD 1.1250	CAD 1.1250
Series D Preferred Stock
Dividends [Line Items]
Dividends declared for preferred share holders	CAD 5,000	CAD 5,000
Dividend declared per preferred share (CAD per share)	CAD 1.2500	CAD 1.2500

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- Definition

Dividends [Line Items]

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Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
-Paragraph 1
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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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