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Share-based compensation - Summary of Performance Share Unit Plan (Detail) - PSU Plan [member] - Options granted from June 2017 [member]	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [line items]
Outstanding, beginning of year	92,424	163,129
Granted	376,310	144,211
Vested		(22,929)
Forfeited	(4,173)	(191,987)
Outstanding, end of year	464,561	92,424

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- Definition

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) granted in a share-based payment arrangement.

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