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Dividends (Detail) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 $ / shares | Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 $ / shares | Jun. 30, 2019 USD ($) $ / shares | Jun. 30, 2019 $ / shares | Jun. 30, 2018 USD ($) $ / shares | Jun. 30, 2018 $ / shares
Dividends [Line Items] |  |  |  |  |  |  |  |
Dividend declared for common share holders | $ | $ 69,868 |  | $ 60,739 |  | $ 133,149 |  | $ 111,359 |
Cash dividend declared per common share (USD per share) | $ / shares | $ 0.1410 |  | $ 0.1282 |  | $ 0.2692 |  | $ 0.2447 |
Series A Preferred Stock |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |
Dividends declared for preferred share holders | $ | $ 1,549 |  | $ 1,350 |  | $ 3,097 |  | $ 2,700 |
Dividend declared per preferred share (CAD per share) | $ / shares |  | $ 0.3226 |  | $ 0.2813 |  | $ 0.6452 |  | $ 0.5626
Series D Preferred Stock |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |
Dividends declared for preferred share holders | $ | $ 1,273 |  | $ 1,250 |  | $ 2,523 |  | $ 2,500 |
Dividend declared per preferred share (CAD per share) | $ / shares |  | $ 0.3182 |  | $ 0.3125 |  | $ 0.6307 |  | $ 0.625

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