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Income Taxes - Summary of Effective Income Tax for Continuing Operations From Statutory Canadian Tax Rates (Detail) | 12 Months Ended
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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%

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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The tax expense (income) divided by the accounting profit. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition 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] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition 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] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition 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] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_c_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Increase decrease in tax rate. + References No definition available. + Details
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- Definition Tax rate effect of adjustments for current tax of prior periods and Other + References No definition available. + Details
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