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Segmented Information - Schedule of Gross Revenue by Services (Detail) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Disclosure of products and services [line items] |  |
Gross revenue | CAD 5,140.1 | CAD 4,300.1
Consulting Services [member] | Buildings Services [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | 898.1 | 818.2
Consulting Services [member] | Energy and Resources Services [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | 479.2 | 418.5
Consulting Services [member] | Environmental Services [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | 683.8 | 636.5
Consulting Services [member] | Infrastructure [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | 1,090.4 | 1,059.7
Consulting Services [member] | Water Services [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | 877.2 | 722.0
Construction Services [member] |  |
Disclosure of products and services [line items] |  |
Gross revenue | CAD 1,111.4 | CAD 645.2

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