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Segmented Information - Schedule of Operating Segments (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of operating segments [line items]    
Gross revenue CAD 5,140.1 CAD 4,300.1
Less subconsultants and other direct expenses 1,722.8 1,201.7
Total net revenue 3,417.3 3,098.4
Gross margin 1,827.9 1,676.3
Consulting Services Canada [member]    
Disclosure of operating segments [line items]    
Gross revenue 1,191.7 1,168.8
Less subconsultants and other direct expenses 164.1 148.2
Total net revenue 1,027.6 1,020.6
Gross margin 551.5 549.7
Consulting Services United States [member]    
Disclosure of operating segments [line items]    
Gross revenue 2,226.0 2,063.0
Less subconsultants and other direct expenses 511.3 467.1
Total net revenue 1,714.7 1,595.9
Gross margin 958.7 883.0
Consulting Services Global [member]    
Disclosure of operating segments [line items]    
Gross revenue 611.0 423.1
Less subconsultants and other direct expenses 179.5 112.9
Total net revenue 431.5 310.2
Gross margin 251.7 180.1
Construction Services [member]    
Disclosure of operating segments [line items]    
Gross revenue 1,111.4 645.2
Less subconsultants and other direct expenses 867.9 473.5
Total net revenue 243.5 171.7
Gross margin 66.0 63.5
Total Segments [member]    
Disclosure of operating segments [line items]    
Gross revenue 5,266.8 4,431.5
Total Segments [member] | Consulting Services Canada [member]    
Disclosure of operating segments [line items]    
Gross revenue 1,221.9 1,200.3
Total Segments [member] | Consulting Services United States [member]    
Disclosure of operating segments [line items]    
Gross revenue 2,254.0 2,078.5
Total Segments [member] | Consulting Services Global [member]    
Disclosure of operating segments [line items]    
Gross revenue 664.7 495.8
Total Segments [member] | Construction Services [member]    
Disclosure of operating segments [line items]    
Gross revenue 1,126.2 656.9
Adjustments and Eliminations [member]    
Disclosure of operating segments [line items]    
Gross revenue 126.7 131.4
Adjustments and Eliminations [member] | Consulting Services Canada [member]    
Disclosure of operating segments [line items]    
Gross revenue 30.2 31.5
Adjustments and Eliminations [member] | Consulting Services United States [member]    
Disclosure of operating segments [line items]    
Gross revenue 28.0 15.5
Adjustments and Eliminations [member] | Consulting Services Global [member]    
Disclosure of operating segments [line items]    
Gross revenue 53.7 72.7
Adjustments and Eliminations [member] | Construction Services [member]    
Disclosure of operating segments [line items]    
Gross revenue CAD 14.8 CAD 11.7