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Share-based payments - Summary of Movements in Number of Share Options Outstanding and Weighted Average Exercise Prices (Detail) - Employee stock option plan [member] | 12 Months Ended
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Dec. 31, 2018 CAD ($) shares | Dec. 31, 2017 CAD ($) shares
Disclosure Of Number And Weighted Average Exercise Price Of Outstanding Share Options [Line Items] |  |
Weighted average exercise price, At January 1, | $ | $ 30.18 | $ 37.75
Weighted average exercise price, Regular options granted | $ | 6.20 | 22.15
Weighted average exercise price, Exercised | $ | 0.00 | 16.10
Weighted average exercise price, Expired | $ | 51.46 | 73.89
Weighted average exercise price, Forfeited | $ | 26.99 | 33.78
Weighted average exercise price, At December 31, | $ | $ 22.56 | $ 30.18
Number of options, At January 1, | shares | 5,944,510 | 5,779,205
Number of options, Regular options granted | shares | 1,078,797 | 1,160,905
Number of options, Exercised | shares | 0 | (48,529)
Number of options, Expired | shares | (870,904) | (788,672)
Number of options, Forfeited | shares | (561,175) | (158,399)
Number of options, At December 31, | shares | 5,591,228 | 5,944,510

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