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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Number of awards |  |  |
Beginning balance (in shares) | 955,028 | 578,988 |
Granted, including dividends (in shares) | 791,524 | 811,974 |
Exercised (in shares) | (285,551) | (374,973) |
Forfeited (in shares) | (68,869) | (60,961) |
Ending balance (in shares) | 1,392,132 | 955,028 | 578,988
Exercisable (in shares) | 173,533 |  |
Weighted average grant-date fair value |  |  |
Beginning balance (CAD per share) | $ 12.30 | $ 9.82 |
Granted, including dividends (CAD per share) | 12.41 | 13.54 |
Exercised (CAD per share) | 10.02 | 8.33 |
Forfeited (CAD per share) | 13.02 | 12.61 |
Ending balance (CAD per share) | 12.75 | $ 12.30 | $ 9.82
Exercisable (CAD per share) | $ 11.66 |  |
Additional Disclosures |  |  |
Outstanding, Weighted average remaining contractual term | 1 year 7 months 6 days | 1 year 10 months 2 days | 1 year 8 months 26 days
Granted, including dividends, Weighted average remaining contractual term | 2 years | 2 years |
Outstanding, aggregate intrinsic value | $ 19,114 | $ 13,428 | $ 6,595
Granted, including dividends, aggregate intrinsic value | 0 | 0 |
Exercised, aggregate intrinsic value | 3,691 | 4,394 |
Forfeited, aggregate intrinsic value | 0 | $ 0 |
Exercisable, aggregate intrinsic value | $ 2,383 |  |

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