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Goodwill - Schedule of Goodwill Allocated (Detail) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Disclosure of goodwill allocated [line items] |  |  |
Goodwill | CAD 1,556.6 | CAD 1,828.1 | CAD 966.5
Consulting Services Canada [member] |  |  |
Disclosure of goodwill allocated [line items] |  |  |
Goodwill | 337.8 | 337.6 |
Consulting Services United States [member] |  |  |
Disclosure of goodwill allocated [line items] |  |  |
Goodwill | 917.7 | 1,073.2 |
Consulting Services Global [member] |  |  |
Disclosure of goodwill allocated [line items] |  |  |
Goodwill | 183.2 | 287.9 |
Construction Services [member] |  |  |
Disclosure of goodwill allocated [line items] |  |  |
Goodwill | CAD 117.9 | CAD 129.4 |

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- Definition The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Business combinations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2017-01-01 -Paragraph B67 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2017-03-01&anchor=para_B67_d&doctype=Appendix&seq=2 -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 134 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_134_a&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2017-01-01 -Paragraph 135 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2017-03-01&anchor=para_135_a&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_54_c&doctype=Standard -URIDate 2017-03-09 + Details
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