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Disposition of a Subsidiary - Additional Information (Detail) CAD in Millions, $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
May 05, 2017 CAD | May 05, 2017 USD ($) | Jun. 30, 2017 CAD | Dec. 31, 2017 CAD | Dec. 31, 2016 CAD
Disclosure of disposal of subsidiaries [line items] |  |  |  |  |
Current tax expense |  |  |  | CAD 192.9 | CAD 37.7
Deferred taxes |  |  |  | (26.4) | CAD 12.6
Disposal of major subsidiary [member] |  |  |  |  |
Disclosure of disposal of subsidiaries [line items] |  |  |  |  |
Name of subsidiary | Innovyze | Innovyze |  |  |
Gross proceeds from sale of subsidiaries | CAD 369.1 | $ 270.0 |  | 369.1 |
Cash proceeds from sale of subsidiaries | CAD 336.9 |  |  | 336.9 |
Repayment of long term debt |  |  |  | CAD 221.3 |
Current tax expense |  |  | CAD 124.1 |  |
Deferred taxes |  |  | CAD 29.6 |  |

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