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Stock-Based Compensation Plans - Summary of Options Outstanding and Exercisable by Range of Exercise Price (Parenthetical) (Detail) - NSRs [Member] | Dec. 31, 2020 $ / shares
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Bottom of Range [Member] | 5.00 to 9.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | $ 5.00
Bottom of Range [Member] | 10.00 to 14.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | 10.00
Bottom of Range [Member] | 15.00 to 19.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | 15.00
Bottom of Range [Member] | 20.00 to 24.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | 20.00
Bottom of Range [Member] | 25.00 to 29.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | 25.00
Bottom of Range [Member] | 30.00 to 34.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | 30.00
Top of Range [Member] | 5.00 to 9.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | 9.99
Top of Range [Member] | 10.00 to 14.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | 14.99
Top of Range [Member] | 15.00 to 19.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | 19.99
Top of Range [Member] | 20.00 to 24.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | 24.99
Top of Range [Member] | 25.00 to 29.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | 29.99
Top of Range [Member] | 30.00 to 34.99 [Member] |
Disclosure of range of exercise prices of outstanding share options [Line Items] |
Exercise price of warrants | $ 34.99

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- Definition The exercise price of outstanding share options. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2020-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2020-en-r&anchor=para_45_d&doctype=Standard -URIDate 2020-01-01 + Details
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