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Events after the Reporting Period - Additional Information (Detail) - CAD ($)
$ / shares in Units, $ in Millions
 1 Months Ended 2 Months Ended 12 Months Ended
Feb. 27, 2019
Jan. 31, 2019
Feb. 19, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of non-adjusting events after reporting period [Line Items]          
Aggregate price of common shares repurchased and cancelled       $ 76.7 $ 14.4
Dividend transaction [member]          
Disclosure of non-adjusting events after reporting period [Line Items]          
Dividends payable declared date Feb. 27, 2019        
Dividends payable amount per share $ 0.145        
Dividend payable date Apr. 15, 2019        
Dividends payable record date Mar. 29, 2019        
Events after reporting period [member]          
Disclosure of non-adjusting events after reporting period [Line Items]          
Agreement expiry date   Jun. 27, 2023      
Interest rate swap agreement, Amount   $ 160.0      
Interest rate swap agreement, Fixed Interest rate   2.295%      
Interest rate swap, description   The swap agreement has the effect of converting the variable interest rate on $160.0 of the Company’s revolving credit facility into a fixed rate of 2.295%, plus an applicable basis points spread.      
Events after reporting period [member] | Normal Course Issuer Bid (NCIB) [member]          
Disclosure of non-adjusting events after reporting period [Line Items]          
Number of Common shares repurchased and cancelled     195,064    
Average price of common shares repurchased and cancelled     $ 30.63    
Aggregate price of common shares repurchased and cancelled     $ 6.0