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Discontinued Operations and Disposition of Subsidiaries - Additional Information (Detail) $ in Millions, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 CAD ($) | Dec. 31, 2018 CAD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 CAD ($)
Disclosure of disposal of subsidiaries and discontinued operations [line items] |  |  |  |
Current tax expense |  | $ 54.5 |  | $ 192.9
Deferred taxes |  | 0.5 |  | (26.4)
Repayment of long term debt |  | 0.3 |  | 2.5
Disposal of major subsidiary [member] |  |  |  |
Disclosure of disposal of subsidiaries and discontinued operations [line items] |  |  |  |
Gross proceeds |  |  |  | 369.1
Current tax expense |  |  |  | 124.1
Deferred taxes |  |  |  | 29.5
Repayment of long term debt |  |  |  | $ 221.3
Construction services group [member] | Discontinued operations [member] |  |  |  |
Disclosure of disposal of subsidiaries and discontinued operations [line items] |  |  |  |
Goodwill impairment charge | $ 53.0 |  |  |
Gross proceeds |  | 104.2 | $ 79.5 |
Cash proceeds from the sale of subsidiary |  | $ 28.8 | $ 22.0 |

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