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Dividends (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2023 USD ($) $ / shares | Jun. 30, 2023 CAD ($) $ / shares | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2022 CAD ($) $ / shares | Jun. 30, 2023 USD ($) $ / shares | Jun. 30, 2023 CAD ($) $ / shares | Jun. 30, 2022 USD ($) $ / shares | Jun. 30, 2022 CAD ($) $ / shares
Dividends [Line Items] |  |  |  |  |  |  |  |
Dividend declared for common share holders | $ | $ 75,379 |  | $ 122,636 |  | $ 150,765 |  | $ 238,209 |
Cash dividend declared per common share (USD per share) | $ / shares | $ 0.1085 |  | $ 0.1808 |  | $ 0.2170 |  | $ 0.3514 |
Series A preferred shares |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |
Dividends declared for preferred share holders | $ |  | $ 1,549 |  | $ 1,549 |  | $ 3,097 |  | $ 3,097
Dividend declared per preferred share (CAD per share) | $ / shares |  | $ 0.3226 |  | $ 0.3226 |  | $ 0.6453 |  | $ 0.6453
Series D preferred shares |  |  |  |  |  |  |  |
Dividends [Line Items] |  |  |  |  |  |  |  |
Dividends declared for preferred share holders | $ |  | $ 1,273 |  | $ 1,273 |  | $ 2,546 |  | $ 2,546
Dividend declared per preferred share (CAD per share) | $ / shares |  | $ 0.3182 |  | $ 0.3182 |  | $ 0.6364 |  | $ 0.6364

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