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Equity - Summary of Outstanding Share Options (Detail) pure in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($)
Disclosure of terms and conditions of share-based payment arrangement [abstract] |  |
Share options, Outstanding at beginning of year | 22,068 | 22,854
Share options, Granted | 1,575 | 2,011
Share options, Exercised | (3,710) | (2,275)
Share options, Forfeited | (107) | (78)
Share options, Expired | (51) | (444)
Share options, Outstanding at end of year | 19,775 | 22,068
Share options, Vested and exercisable at end of year | 14,036 | 12,266
Weighted Average Exercise Price, Outstanding at beginning of year | $ 19.52 | $ 18.38
Weighted Average Exercise Price, Granted | 37.44 | 27.79
Weighted Average Exercise Price, Exercised | 14.58 | 11.47
Weighted Average Exercise Price, Forfeited | 32.92 | 16.25
Weighted Average Exercise Price, Expired | 37.56 | 40.40
Weighted Average Exercise Price, Outstanding at end of year | 21.75 | 19.52
Weighted Average Exercise Price, Vested and exercisable at end of year | $ 22.83 | $ 24.94

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