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Goodwill and Intangible Assets - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 CAD ($) Multiple | Dec. 31, 2017 CAD ($) Multiple
Disclosure of detailed information about intangible assets [Line Items] |  |
Impairment loss recognised in profit or loss good will | $ | $ 0 | $ 0
Canada [member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Tax rate applied to cash flow projections | 30.80% | 30.80%
U.S. [member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Tax rate applied to cash flow projections | 26.80% | 26.80%
Japan [Member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Tax rate applied to cash flow projections | 21.00% | 35.00%
Bottom of range [Member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Price-to-earnings multiples | 9.0 | 10.6
Growth rate used to extrapolate cash flow projections | 0.00% | (5.00%)
After-tax discount rate applied to cash flow projections | 7.50% | 9.20%
Pre-tax discount rate applied to cash flow projections | 10.20% | 11.30%
Top of range [Member] |  |
Disclosure of detailed information about intangible assets [Line Items] |  |
Price-to-earnings multiples | 11.7 | 14.8
Growth rate used to extrapolate cash flow projections | 17.00% | 17.00%
After-tax discount rate applied to cash flow projections | 14.20% | 14.20%
Pre-tax discount rate applied to cash flow projections | 20.40% | 20.40%

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- Definition The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 134 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_d_v&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 134 -Subparagraph e -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_e_v&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Cash-generating units [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 134 -Subparagraph d -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_d_iv&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 134 -Subparagraph e -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_134_e_iv&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B67 -Subparagraph d -Clause v -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B67_d_v&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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