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Shareholder's capital - Performance Stock Units (Detail) - Performance share units - CAD CAD / shares in Units, CAD in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Number of awards |  |  |
Beginning balance (in shares) | 578,988 | 564,116 |
Granted (in shares) | 811,974 | 219,315 |
Exercised (in shares) | (374,973) | (181,875) |
Forfeited (in shares) | (60,961) | (22,568) |
Ending balance (in shares) | 955,028 | 578,988 | 564,116
Exercisable (in shares) | 172,031 |  |
Weighted average grant-date fair value |  |  |
Beginning balance (CAD per share) | CAD 9.82 | CAD 7.59 |
Granted (CAD per share) | 13.54 | 11.62 |
Exercised (CAD per share) | 8.33 | 8.29 |
Forfeited (CAD per share) | 12.61 | 9.64 |
Ending balance (CAD per share) | 12.30 | CAD 9.82 | CAD 7.59
Exercisable (CAD per share) | CAD 9.75 |  |
Additional Disclosures |  |  |
Outstanding, Weighted average remaining contractual term | 1 year 10 months 2 days | 1 year 8 months 26 days | 1 year 7 months 17 days
Granted, Weighted average remaining contractual term | 2 years | 2 years |
Outstanding, aggregate intrinsic value | CAD 13,428 | CAD 6,595 | CAD 6,155
Granted, aggregate intrinsic value | 0 | 0 |
Exercised, aggregate intrinsic value | 4,394 | 2,115 |
Forfeited, aggregate intrinsic value | 0 | CAD 0 |
Exercisable, aggregate intrinsic value | CAD 2,423 |  |

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