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Share-based Payment - Number and Weighted Average Exercise Prices ("WAEP") of, and Movements in Share Options (Detail)
12 Months Ended
Dec. 31, 2021
shares
Associate
$ / shares
Dec. 31, 2020
shares
Associate
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]    
Outstanding at January 1 | shares 470,000 470,000
Cancelled during the year | Associate (200,000) 0
Number of share options outstanding | shares 270,000 470,000
Number of share options exercisable | shares 270,000 470,000
Beginning balance $ 21.11 $ 21.11
Cancelled during the year 21.11 0
WAEP outstanding 21.11 21.11
WAEP exercisable $ 21.11 $ 21.11