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Segmented Information - Schedule of Operating Segments (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]    
Gross revenue $ 4,283.8 $ 4,028.7
Gross revenue 4,283.8 4,028.7
Less subconsultants and other direct expenses 928.6 854.9
Net revenue 3,355.2 3,173.8
Gross margin 1,815.2 1,761.9
Adjustments and Eliminations [member]    
Disclosure of operating segments [line items]    
Gross revenue 135.8  
Gross revenue   111.9
Gross revenue (135.8)  
Total Segments [member]    
Disclosure of operating segments [line items]    
Gross revenue 4,419.6  
Gross revenue   4,140.6
Consulting Services Canada [member]    
Disclosure of operating segments [line items]    
Gross revenue 1,275.8 1,191.7
Gross revenue 35.2  
Less subconsultants and other direct expenses 188.0 164.1
Net revenue 1,087.8 1,027.6
Gross margin 557.0 551.5
Consulting Services Canada [member] | Adjustments and Eliminations [member]    
Disclosure of operating segments [line items]    
Gross revenue 35.2  
Gross revenue   30.2
Consulting Services Canada [member] | Total Segments [member]    
Disclosure of operating segments [line items]    
Gross revenue 1,311.0  
Gross revenue   1,221.9
Consulting Services United States [member]    
Disclosure of operating segments [line items]    
Gross revenue 2,334.6 2,226.0
Less subconsultants and other direct expenses 560.2 511.3
Net revenue 1,774.4 1,714.7
Gross margin 982.5 958.7
Consulting Services United States [member] | Adjustments and Eliminations [member]    
Disclosure of operating segments [line items]    
Gross revenue 31.3  
Gross revenue   28.0
Consulting Services United States [member] | Total Segments [member]    
Disclosure of operating segments [line items]    
Gross revenue 2,365.9  
Gross revenue   2,254.0
Consulting Services Global [member]    
Disclosure of operating segments [line items]    
Gross revenue 673.4 611.0
Less subconsultants and other direct expenses 180.4 179.5
Net revenue 493.0 431.5
Gross margin 275.7 251.7
Consulting Services Global [member] | Adjustments and Eliminations [member]    
Disclosure of operating segments [line items]    
Gross revenue 69.3  
Gross revenue   53.7
Consulting Services Global [member] | Total Segments [member]    
Disclosure of operating segments [line items]    
Gross revenue $ 742.7  
Gross revenue   $ 664.7