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Share Capital - Summary of Granted Share Options (Detail) | 12 Months Ended
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Dec. 31, 2017 CAD Options | Dec. 31, 2016 CAD Options
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share options, beginning of the year | Options | 3,655,020 |
Share options, Granted | 1,229,689 | 995,904
Share options, end of the year | Options | 4,426,237 | 3,655,020
Officers and employees [member] |  |
Disclosure of terms and conditions of share-based payment arrangement [line items] |  |
Share options, beginning of the year | 3,655,020 | 2,980,601
Share options, Granted | 1,229,689 | 995,904
Share options, Exercised | (376,160) | (254,156)
Share options, Forfeited | (82,312) | (67,329)
Share options, end of the year | 4,426,237 | 3,655,020
Weighted Average Exercise Price, Share option, beginning of the year | CAD 28.33 | CAD 26.17
Weighted Average Exercise Price, Share option, Granted | 31.75 | 32.83
Weighted Average Exercise Price, Share option, Exercised | 21.09 | 19.76
Weighted Average Exercise Price, Share option, Forfeited | 31.57 | 31.45
Weighted Average Exercise Price, Share option, end of the year | CAD 29.84 | CAD 28.33

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