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Dividends (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2018 CAD ($) $ / shares | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 CAD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares
Dividends [Line Items] |  |  |  |
Dividend declared for common share holders | $ |  | $ 235,440 |  | $ 185,915
Cash dividend declared per common share (USD per share) | $ / shares |  | $ 0.5011 |  | $ 0.4660
Series A Preferred Stock |  |  |  |
Dividends [Line Items] |  |  |  |
Dividends declared for preferred share holders | $ | $ 5,400 |  | $ 5,400 |
Dividend declared per preferred share (CAD per share) | $ / shares | $ 1.1250 |  | $ 1.1250 |
Series D Preferred Stock |  |  |  |
Dividends [Line Items] |  |  |  |
Dividends declared for preferred share holders | $ | $ 5,000 |  | $ 5,000 |
Dividend declared per preferred share (CAD per share) | $ / shares | $ 1.2500 |  | $ 1.2500 |

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