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Investments in Joint Ventures and Associates - Summary of Material Joint Ventures, Based on Financial Statements (Detail) - CAD CAD in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of joint operations [line items] |  |  |
Revenue | CAD 5,140.1 | CAD 4,300.1 |
Income tax expense | 166.5 | 50.3 |
Net income for the year | 97.0 | 130.5 |
Total comprehensive income | (20.8) | 132.2 |
Aggregate carrying value | 9.7 | 9.2 | CAD 4.5
Aggregated individually immaterial joint ventures and associates [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Total comprehensive income | 1.8 | 2.2 |
Aggregate carrying value | 5.0 | 5.1 |
PAE Limited [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Revenue | 61.3 | 28.6 |
Other expenses | 58.7 | 27.6 |
Income tax expense | 0.6 | 0.6 |
Net income for the year | 2.0 | 0.4 |
Total comprehensive income | 2.0 | CAD 0.4 |
ESH MWH Limited. [member] |  |  |
Disclosure of joint operations [line items] |  |  |
Revenue | 30.1 |  |
Other expenses | CAD 30.1 |  |

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