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Income Tax Expense - Summary of Tax Loss Carry Forward (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Tax Loss Carryforwards [line items]    
Total € 380,522 € 367,620
Not More than Five Years [Member]    
Disclosure Of Tax Loss Carryforwards [line items]    
Total € 7,720 € 4,582
Expiration Date 2025-2029 2024-2028
More than Five Years [Member]    
Disclosure Of Tax Loss Carryforwards [line items]    
Total € 127 € 378
Expiration Date 2029 2028
No expiration [member]    
Disclosure Of Tax Loss Carryforwards [line items]    
Total € 372,675 € 362,660