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Income Tax Expense - Summary of Tax Loss Carry Forward (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Tax Loss Carryforwards [line items]    
Total € 367,620 € 366,175
Not More than Five Years [Member]    
Disclosure Of Tax Loss Carryforwards [line items]    
Total € 4,582 € 5,132
Expiration Date 2024-2028 2023-2027
More than Five Years [Member]    
Disclosure Of Tax Loss Carryforwards [line items]    
Total € 378 € 347
Expiration Date 2028 2027
No expiration [member]    
Disclosure Of Tax Loss Carryforwards [line items]    
Total € 362,660 € 360,696