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Segmented Information - Schedule of Operating Segments (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]    
Gross revenue $ 4,827.3 $ 4,283.8
Gross revenue 4,827.3 4,283.8
Less subconsultants and other direct expenses 1,116.0 928.6
Net revenue 3,711.3 3,355.2
Gross margin 2,008.4 1,815.2
Adjustments and Eliminations [member]    
Disclosure of operating segments [line items]    
Gross revenue (111.4) (135.8)
Less inter-segment revenue (111.4) (135.8)
Total Segments [member]    
Disclosure of operating segments [line items]    
Gross revenue 4,938.7 4,419.6
Gross revenue 4,827.3 4,283.8
Less inter-segment revenue 111.4 135.8
Less subconsultants and other direct expenses 1,116.0 928.6
Net revenue 3,711.3 3,355.2
Gross margin 2,008.4 1,815.2
Canada [member]    
Disclosure of operating segments [line items]    
Gross revenue 1,283.1 1,275.8
Canada [member] | Total Segments [member]    
Disclosure of operating segments [line items]    
Gross revenue 1,314.7 1,311.0
Gross revenue 1,283.1 1,275.8
Less inter-segment revenue 31.6 35.2
Less subconsultants and other direct expenses 173.6 188.0
Net revenue 1,109.5 1,087.8
Gross margin 571.1 557.0
United States [member]    
Disclosure of operating segments [line items]    
Gross revenue 2,688.1 2,334.6
United States [member] | Total Segments [member]    
Disclosure of operating segments [line items]    
Gross revenue 2,709.8 2,365.9
Gross revenue 2,688.1 2,334.6
Less inter-segment revenue 21.7 31.3
Less subconsultants and other direct expenses 740.5 560.2
Net revenue 1,947.6 1,774.4
Gross margin 1,070.2 982.5
Global [member] | Total Segments [member]    
Disclosure of operating segments [line items]    
Gross revenue 914.2 742.7
Gross revenue 856.1 673.4
Less inter-segment revenue 58.1 69.3
Less subconsultants and other direct expenses 201.9 180.4
Net revenue 654.2 493.0
Gross margin $ 367.1 $ 275.7