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Share Capital and Earnings Per Share - Summary of Further Information on Preferred Shares Outstanding (Parenthetical) (Detail) - $ / shares |  |  | 12 Months Ended
--- | --- | --- | ---
Sep. 19, 2018 | Mar. 19, 2018 | Dec. 31, 2018
Class 1, Series 4 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Annual dividend rate |  |  | Floating
Class 1, Series 4 Preferred shares [Member] | If redeemed on June 19, 2021 [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Price per share |  |  | $ 25.00
Class 1, Series 4 Preferred shares [Member] | If redeemed after June 19, 2021 [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Price per share |  |  | $ 25.50
Class 1, Series 4 Preferred shares [Member] | Major ordinary share transactions [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Basis spread on dividend rate |  |  | 1.41%
Floating dividend rate, description |  |  | Three-month Government of Canada Treasury bill yield plus 1.41%.
Class 1, Series 3 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 1.41%
Class 1, Series 5 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 2.90%
Class 1, Series 7 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 3.13%
Annual dividend rate | 4.414% |  |
Class 1, Series 9 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 2.86%
Class 1, Series 11 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 2.61%
Annual dividend rate |  | 4.731% |
Class 1, Series 13 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 2.22%
Class 1, Series 15 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 2.16%
Class 1, Series 17 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 2.36%
Class 1, Series 19 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 2.30%
Class 1, Series 21 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 4.97%
Class 1, Series 23 Preferred shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 3.83%
Class 1, Series 25 Preferred Shares [Member] |  |  |
Disclosure of classes of share capital [Line Items] |  |  |
Specified yield percentage |  |  | 2.55%

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