Share-based Payment Expense - Share Option Schemes - Summary of Weighted Average Remaining Contractual Life for Share Options Outstanding (Detail)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share option schemes [member]
Disclosure Of Share Based Compensation Expense [line items]
Weighted average remaining contractual life for the share options outstanding at 31 December (years)	1 year 3 months 18 days	2 years 3 months 18 days	3 years 3 months 18 days

The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2021-01-01
-Paragraph 45
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_d&doctype=Standard
-URIDate 2021-03-24

Name:	ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration