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Shareholders Equity and Share Based Compensation - Summary of Non-vested Stock Option (Detail) - CAD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Beginning balance	745,329
Granted	1,081,488
Vested	(362,664)
Forfeited	(14,999)
Ending balance	1,449,154	745,329
Beginning balance	$ 7.43
Granted	5.83	$ 9.58	$ 3.22
Vested	6.36
Forfeited	6.05
Ending balance	$ 6.52	$ 7.43
Ending balance	$ 4,931

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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Number of non-vested options outstanding.

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Weighted average grant-date fair value of non-vested options forfeited.

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Weighted average grant-date fair value of non-vested options outstanding.

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Share based compensation arrangement by share based payment award options nonvested outstanding intrinsic value

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