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Goodwill and Intangible Assets - Additional Information (Detail)	12 Months Ended
	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%

X

- 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
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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
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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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
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The pre tax discount rate applied to cash flow projections for a cash-generating unit (group of units).

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The tax rate applied to cash flow projections for a cash-generating unit (group of units).

+ References

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