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Share-based payments - Summary of Range of Exercise Prices of Outstanding Share Options (Detail) | Dec. 31, 2017 CAD ($) shares yr | Dec. 31, 2016 shares | Dec. 31, 2015 shares
--- | --- | --- | ---
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | 29,722,573 | 28,896,035 | 25,519,434
Employee stock option plan [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | 29,722,573 |  |
Option outstanding, weighted average remaining contractual life (years) | yr | 2.3 |  |
Option outstanding, Weighted average exercise price | $ | $ 6.04 |  |
Exercisable options, Shares | 18,583,426 |  |
Exercisable options, Weighted average exercise price | $ | $ 7.34 |  |
Employee stock option plan [member] | $3.00 to $3.99 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | 7,835,899 |  |
Option outstanding, weighted average remaining contractual life (years) | yr | 3.1 |  |
Option outstanding, Weighted average exercise price | $ | $ 3.23 |  |
Exercisable options, Shares | 2,514,519 |  |
Exercisable options, Weighted average exercise price | $ | $ 3.25 |  |
Employee stock option plan [member] | $4.00 to $4.99 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | 5,842,935 |  |
Option outstanding, weighted average remaining contractual life (years) | yr | 4.1 |  |
Option outstanding, Weighted average exercise price | $ | $ 4.43 |  |
Exercisable options, Shares | 33,333 |  |
Exercisable options, Weighted average exercise price | $ | $ 4.23 |  |
Employee stock option plan [member] | $5.00 to $5.99 [Member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | 12,247 |  |
Option outstanding, weighted average remaining contractual life (years) | yr | 3.4 |  |
Option outstanding, Weighted average exercise price | $ | $ 5.91 |  |
Exercisable options, Shares | 4,082 |  |
Exercisable options, Weighted average exercise price | $ | $ 5.91 |  |
Employee stock option plan [member] | $6.00 to $6.99 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | 6,916,166 |  |
Option outstanding, weighted average remaining contractual life (years) | yr | 2.1 |  |
Option outstanding, Weighted average exercise price | $ | $ 6.66 |  |
Exercisable options, Shares | 6,916,166 |  |
Exercisable options, Weighted average exercise price | $ | $ 6.66 |  |
Employee stock option plan [member] | $7.00 to $7.99 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | 4,903,752 |  |
Option outstanding, weighted average remaining contractual life (years) | yr | 1.1 |  |
Option outstanding, Weighted average exercise price | $ | $ 7.81 |  |
Exercisable options, Shares | 4,903,752 |  |
Exercisable options, Weighted average exercise price | $ | $ 7.81 |  |
Employee stock option plan [member] | $8.00 to $8.99 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | 45,405 |  |
Option outstanding, weighted average remaining contractual life (years) | yr | 0.3 |  |
Option outstanding, Weighted average exercise price | $ | $ 8.19 |  |
Exercisable options, Shares | 45,405 |  |
Exercisable options, Weighted average exercise price | $ | $ 8.19 |  |
Employee stock option plan [member] | $10.00 to $10.99 [member] |  |  |
Disclosure of range of exercise prices of outstanding share options [line items] |  |  |
Option outstanding, Shares | 4,166,169 |  |
Option outstanding, weighted average remaining contractual life (years) | yr | 0.2 |  |
Option outstanding, Weighted average exercise price | $ | $ 10.42 |  |
Exercisable options, Shares | 4,166,169 |  |
Exercisable options, Weighted average exercise price | $ | $ 10.42 |  |

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