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Investments in Joint Ventures and Associates - Summary of Material Joint Ventures, Based on Financial Statements (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of joint operations [line items]      
Revenue CAD 5,140.1 CAD 4,300.1  
Income tax expense 166.5 50.3  
Net income for the year 97.0 130.5  
Total comprehensive income (20.8) 132.2  
Aggregate carrying value 9.7 9.2 CAD 4.5
Aggregated individually immaterial joint ventures and associates [member]      
Disclosure of joint operations [line items]      
Total comprehensive income 1.8 2.2  
Aggregate carrying value 5.0 5.1  
PAE Limited [member]      
Disclosure of joint operations [line items]      
Revenue 61.3 28.6  
Other expenses 58.7 27.6  
Income tax expense 0.6 0.6  
Net income for the year 2.0 0.4  
Total comprehensive income 2.0 CAD 0.4  
ESH MWH Limited. [member]      
Disclosure of joint operations [line items]      
Revenue 30.1    
Other expenses CAD 30.1