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Shareholder's capital - Performance Stock Units (Detail) - Performance and restricted share units - CAD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Number of awards |  |  |
Beginning balance (in shares) | 1,392,132 | 955,028 |
Granted, including dividends (in shares) | 1,471,442 | 791,524 |
Exercised (in shares) | (344,340) | (285,551) |
Forfeited (in shares) | (107,191) | (68,869) |
Ending balance (in shares) | 2,412,043 | 1,392,132 | 955,028
Exercisable (in shares) | 743,787 |  |
Weighted average grant-date fair value |  |  |
Beginning balance (CAD per share) | $ 12.75 | $ 12.30 |
Granted, including dividends (CAD per share) | 14.69 | 12.41 |
Exercised (CAD per share) | 11.55 | 10.02 |
Forfeited (CAD per share) | 13.84 | 13.02 |
Ending balance (CAD per share) | 14.00 | $ 12.75 | $ 12.30
Exercisable (CAD per share) | $ 13.21 |  |
Additional Disclosures |  |  |
Outstanding, Weighted average remaining contractual term | 1 year 10 months 9 days | 1 year 7 months 6 days | 1 year 10 months 2 days
Granted, including dividends, Weighted average remaining contractual term | 2 years | 2 years |
Outstanding, aggregate intrinsic value | $ 44,309 | $ 19,114 | $ 13,428
Granted, including dividends, aggregate intrinsic value | 16,302 | 10,098 |
Exercised, aggregate intrinsic value | 5,148 | 3,691 |
Forfeited, aggregate intrinsic value | 0 | $ 0 |
Exercisable, aggregate intrinsic value | $ 13,663 |  |

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