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Stock-Based Compensation - Schedule of Other Equity Instruments (Detail) - Deferred Share Units [Member] - Equity	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of range of exercise prices of outstanding share options [Line Items]
Issued	101,000	145,400
Board of Director [Member]
Disclosure of range of exercise prices of outstanding share options [Line Items]
Beginning balance	2,169,000	2,395,000
Issued	161,000	214,000
Reinvested	100,000	145,000
Redeemed	(345,000)	(576,000)
Forfeitures and cancellations	(6,000)	(9,000)
Ending balance	2,079,000	2,169,000

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

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The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2021-01-01
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The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

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Number of other equity instruments issued in share-based payment arrangement.

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Number of other equity instruments redeemed in share-based payment arrangement.

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Number of other equity instruments reinvested in share-based payment arrangement.

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