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Income Taxes - Schedule of Significant Components of the Company's Net Deferred Income Tax Assets (Liabilities) (Detail) - CAD CAD in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Deferred income tax assets (liabilities) |  |  |
Deferred income tax assets (liabilities) | CAD (31.4) | CAD (53.4) | CAD (10.0)
Non-capital and capital tax losses [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred income tax assets | 36.1 | 69.3 |
Loss and tax credit carryforwards [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred income tax assets | 9.6 | 22.2 |
Deferred tax defined benefit obligation [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred income tax assets | 3.3 | 8.7 |
Property, plant and equipment [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred tax liabilities | (3.6) | 4.6 |
Intangible asset [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred tax liabilities | (78.8) | (150.7) |
Deferred tax arising in business acquisition [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred tax liabilities | (2.5) | (7.8) |
Other temporary differences [member] |  |  |
Deferred income tax assets (liabilities) |  |  |
Deferred income tax assets | CAD 4.5 | CAD 0.3 |

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