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Share-based payments - Summary of Movements in Number of Share Options Outstanding and Weighted Average Exercise Prices (Detail) | 12 Months Ended
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Dec. 31, 2017 CAD ($) shares | Dec. 31, 2016 CAD ($) shares
Disclosure of number and weighted average exercise price of share options [abstract] |  |
Weighted average exercise price, At January 1, | $ | $ 7.55 | $ 9.97
Weighted average exercise price, Regular options granted | $ | 4.43 | 3.24
Weighted average exercise price, Exercised | $ | 3.22 |
Weighted average exercise price, Forfeited | $ | 13.44 | 11.49
Weighted average exercise price, At December 31, | $ | $ 6.04 | $ 7.55
Number of options, At January 1, | shares | 28,896,035 | 25,519,434
Number of options, Regular options granted | shares | 5,804,535 | 9,101,164
Number of options, Exercised | shares | (242,648) |
Number of options, Forfeited | shares | (4,735,349) | (5,724,563)
Number of options, At December 31, | shares | 29,722,573 | 28,896,035

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