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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Number of awards      
Beginning balance (in shares) 564,116 440,086  
Granted (in shares) 219,315 212,250  
Exercised (in shares) (181,875) (41,131)  
Forfeited (in shares) (22,568) (47,089)  
Ending balance (in shares) 578,988 564,116 440,086
Exercisable (in shares) 215,790    
Weighted average grant-date fair value      
Beginning balance (CAD per share) CAD 7.59 CAD 6.57  
Granted (CAD per share) 11.62 9.72  
Exercised (CAD per share) 8.29 6.86  
Forfeited (CAD per share) 9.64 8.30  
Ending balance (CAD per share) 9.82 CAD 7.59 CAD 6.57
Exercisable (CAD per share) CAD 8.22    
Additional Disclosures      
Outstanding, Weighted average remaining contractual term 1 year 8 months 27 days 1 year 7 months 17 days 1 year 9 months 22 days
Granted, Weighted average remaining contractual term 2 years 2 years 7 months 13 days  
Outstanding, aggregate intrinsic value CAD 6,595 CAD 6,155 CAD 4,242
Granted, aggregate intrinsic value 0 0  
Exercised, aggregate intrinsic value 2,115 381  
Forfeited, aggregate intrinsic value 0 CAD 0  
Exercisable, aggregate intrinsic value CAD 2,458