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v3.21.1

Shareholders' capital - Stock Option Activity (Detail) - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Number of awards |  |  |
Beginning balance (in shares) | 3,523,912 | 6,292,642 |
Granted (in shares) | 999,962 | 1,113,775 |
Exercised (in shares) | (2,386,275) | (3,882,505) |
Forfeited (in shares) | (27,151) |  |
Ending balance (in shares) | 2,110,448 | 3,523,912 | 6,292,642
Exercisable (in shares) | 1,710,662 |  |
Weighted average exercise price |  |  |
Beginning balance (CAD per share) | $ 13.09 | $ 11.61 |
Granted (CAD per share) | 16.78 | 14.96 |
Exercised (CAD per share) | 12.52 | 11.23 |
Forfeited (CAD per share) | 14.96 |  |
Ending balance (CAD per share) | 15.45 | $ 13.09 | $ 11.61
Exercisable (CAD per share) | $ 15.22 |  |
Additional Disclosures |  |  |
Outstanding shares, weighted average remaining contractual term | 6 years 6 months 18 days | 5 years 10 months 13 days | 5 years 9 months
Granted, weighted average remaining contractual term | 7 years 3 months 7 days | 8 years |
Exercised shares, weighted average remaining contractual term | 5 years 1 month 28 days | 4 years 5 months 12 days |
Exercisable , weighted average remaining contractual term | 6 years 5 months 8 days |  |
Beginning balance, aggregate intrinsic value | $ 18,609 | $ 13,342 |
Granted, aggregate intrinsic value | 0 | 0 |
Exercised, aggregate intrinsic value | 18,465 | 6,225 |
Ending balance, aggregate intrinsic value | 11,604 | $ 18,609 | $ 13,342
Exercisable, aggregate intrinsic value | $ 9,798 |  |

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