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Share-based compensation - Options on USD-denominated listed share (Detail)
12 Months Ended
Dec. 31, 2023
$ / shares
Share-based compensation [Line Items]  
Number of share options granted in share-based payment arrangement 3,831,000
US Dollar [Member]  
Share-based compensation [Line Items]  
Number of share options granted in share-based payment arrangement 2,179,500
Weighted average exercise price of share options granted in share-based payment arrangement $ 24.42
Number of share options forfeited in share-based payment arrangement (250,500)
Weighted average exercise price of share options forfeited in share-based payment arrangement $ 24.42
Number of share options outstanding in share-based payment arrangement 1,929,000
Weighted average exercise price of share options outstanding in share-based payment arrangement $ 24.42