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Dividends (Detail) - CAD CAD / shares in Units, CAD in Thousands | 12 Months Ended
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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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