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Equity - Summary of Outstanding Share Options (Detail) | 12 Months Ended
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Dec. 31, 2017 CAD | Dec. 31, 2016 CAD
Disclosure of terms and conditions of share-based payment arrangement [abstract] |  |
Share options, Outstanding at beginning of year | 22,854,000 | 15,929,000
Share options, Granted | 2,011,000 | 8,946,000
Share options, Exercised | (2,275,000) | (647,000)
Share options, Forfeited | (78,000) | (219,000)
Share options, Expired | (444,000) | (1,155,000)
Share options, Outstanding at end of year | 22,068,000 | 22,854,000
Share options, Vested and exercisable at end of year | 12,266,000 | 9,090,000
Weighted Average Exercise Price, Outstanding at beginning of year | CAD 18.38 | CAD 26.53
Weighted Average Exercise Price, Granted | 27.79 | 5.48
Weighted Average Exercise Price, Exercised | 11.47 | 12.15
Weighted Average Exercise Price, Forfeited | 16.25 | 10.74
Weighted Average Exercise Price, Expired | 40.40 | 35.73
Weighted Average Exercise Price, Outstanding at end of year | 19.52 | 18.38
Weighted Average Exercise Price, Vested and exercisable at end of year | CAD 24.94 | CAD 29.70

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