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Financial Instruments - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Jun. 27, 2018
CAD ($)
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Maximum amount of credit risk exposure $ 1,681,300,000 $ 1,667,400,000  
Number of target days of revenue in trade receivables 66 days 55 days  
Write off of trade receivables $ 800,000    
Trade and other receivables 1,500,000 $ 2,100,000  
Trade and unbilled receivables [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Trade and other receivables 1,500,000    
Contract assets and holdbacks [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Trade and other receivables 400,000    
0.5% Increase in interest rates [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Equity price impact on comprehensive income 3,200,000    
0.5% Decrease in interest rates [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Equity price impact on comprehensive income 3,200,000    
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 300,000    
1.0% Decrease in equity Price risk [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Equity price impact on comprehensive income $ 300,000    
Top of range [member]      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Net debt to EBITDA ratio 2.5    
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   $ 800,000,000
Unused capacity amount $ 223,400,000 $ 538,300,000