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Stock-Based Compensation - Schedule of Other Equity Instruments (Detail) - Deferred Share Units [Member] - Board of Director [Member] - Equity	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Disclosure of range of exercise prices of outstanding share options [Line Items]
Beginning balance	2,645,000	2,682,000
Issued	141,000	156,000
Reinvested	98,000	88,000
Redeemed	(346,000)	(279,000)
Forfeitures and cancellations		(2,000)
Ending balance	2,538,000	2,645,000

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

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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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