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Income Taxes - Summary of Effective Income Tax for Continuing Operations From Statutory Canadian Tax Rates (Detail)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of average effective tax rate and applicable tax rate [abstract]
Income tax expense at statutory Canadian rates	27.10%	27.00%
Increase (decrease) resulting from:
Transition tax related to US tax reform	(4.40%)	11.80%
Rate differential on foreign income	(3.10%)	4.00%
Research and development and other tax credits	(0.70%)	(2.70%)
Unrecognized tax losses and temporary differences	2.00%	(0.50%)
Adjustments in respect of prior years and other	2.60%	0.40%
Non-deductible expenses and non-taxable income	0.80%	(3.50%)
Reorganization of corporate structure		1.20%
Disposition of a subsidiary		30.30%
Statutory rate change on deferred tax balances		(4.80%)
Average effective tax rate	24.30%	63.20%

X

- Definition

The applicable income tax rate.

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- Definition

The tax expense (income) divided by the accounting profit. [Refer: Accounting profit]

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The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from a change in tax rate. [Refer: Average effective tax rate; Applicable tax rate]

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The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the application of foreign tax rates. [Refer: Average effective tax rate; Applicable tax rate]

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The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from tax losses. [Refer: Average effective tax rate; Applicable tax rate]

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Increase decrease in tax rate.

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Tax rate effect of adjustments for current tax of prior periods and Other

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Tax rate effect of disposition of subsidiary.

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Tax rate effect of non deductible expense and non taxable income.

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Tax rate effect of reorganization of corporate structure.

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Tax rate effect of research and development and other tax credits.

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Tax rate effect of transition tax related to tax reform.

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