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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

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