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Discontinued Operations and Disposition of Subsidiaries - Additional Information (Detail)
$ in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2018
CAD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CAD ($)
Disclosure of disposal of subsidiaries and discontinued operations [line items]        
Current tax expense   $ 54.5   $ 192.9
Deferred taxes   0.5   (26.4)
Repayment of long term debt   0.3   2.5
Disposal of major subsidiary [member]        
Disclosure of disposal of subsidiaries and discontinued operations [line items]        
Gross proceeds       369.1
Current tax expense       124.1
Deferred taxes       29.5
Repayment of long term debt       $ 221.3
Construction services group [member] | Discontinued operations [member]        
Disclosure of disposal of subsidiaries and discontinued operations [line items]        
Goodwill impairment charge $ 53.0      
Gross proceeds   104.2 $ 79.5  
Cash proceeds from the sale of subsidiary   $ 28.8 $ 22.0