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Dividends (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands |  | 12 Months Ended
--- | --- | ---
Mar. 30, 2019 $ / shares | Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 USD ($) $ / shares | Dec. 31, 2019 CAD ($) $ / shares
Dividends [Line Items] |  |  |  |  |
Dividend declared for common share holders |  | $ 344,382 |  | $ 277,835 |
Cash dividend declared per common share (USD per share) | $ / shares |  | $ 0.6063 |  | $ 0.5512 |
Series A Preferred Stock |  |  |  |  |
Dividends [Line Items] |  |  |  |  |
Dividends declared for preferred share holders |  |  | $ 6,194 |  | $ 6,194
Dividend declared per preferred share (CAD per share) | (per share) |  | 1.2905 |  |  | $ 1.2905
Series D Preferred Stock |  |  |  |  |
Dividends [Line Items] |  |  |  |  |
Dividends declared for preferred share holders |  |  | $ 5,091 |  | $ 5,068
Dividend declared per preferred share (CAD per share) | (per share) | $ 1.25 | $ 1.2728 |  |  | $ 1.2671

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