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Financial Instruments - Additional Information (Detail)
£ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2019
GBP (£)
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Maximum amount of credit risk exposure $ 1,682,400,000 $ 1,687,800,000  
Number of target days of revenue in trade receivables 61 days 66 days  
Decrease through write-off, financial assets $ 1,700,000 $ 800,000  
Interest rate impact on comprehensive income 2,200,000    
Unrealized loss on interest rate swap 200,000    
Cash flow hedges [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest rate swap agreement, Amount 160,000,000    
Unrealized loss on interest rate swap $ 1,500,000    
Hedge ratio description The Company has established a hedge ratio of 1:1 for the hedging relationship as the underlying risk of the interest rate swap is identical to the hedged risk component.    
Interest rate swap agreement, Fixed Interest rate 2.295%   2.295%
Gains (losses) on cash flow hedges, net of tax $ 1,100,000    
Forward contract [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Derivative notional amount 31,000,000   £ 18.0
1.0% Increase in equity price risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Equity price impact on comprehensive income 400,000    
1.0% Decrease in equity Price risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Interest rate impact on comprehensive income 400,000    
Revolving credit facilities [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Amount of revolving credit facility 800,000,000    
Unused capacity amount $ 282,600,000 $ 223,400,000