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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

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