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Share-based compensation - Options on EUR-denominated listed share (Detail) - Euro [Member]
12 Months Ended
Dec. 31, 2022
€ / shares
Dec. 31, 2021
€ / shares
Share-based compensation [Line Items]    
Number of share options outstanding in share-based payment arrangement 750  
Option plans [Member]    
Share-based compensation [Line Items]    
Number of share options outstanding in share-based payment arrangement 750 239,077
Weighted average exercise price of share options outstanding in share-based payment arrangement € 22.43 € 14.93
Number of share options exercised in share-based payment arrangement (226,177)  
Weighted average exercise price of share options exercised in share-based payment arrangement € 14.91  
Number of share options expired in share-based payment arrangement (12,150)  
Weighted average exercise price of share options expired in share-based payment arrangement € 14.82  
Number of share options exercisable in share-based payment arrangement 750  
Weighted average exercise price of share options exercisable in share-based payment arrangement € 22.43