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Significant Events in the Reporting Period - Additional Information (Detail)
€ in Thousands
3 Months Ended
Mar. 21, 2025
EUR (€)
Feb. 12, 2025
EUR (€)
Mar. 31, 2025
EUR (€)
shares
Mar. 31, 2025
$ / shares
Mar. 31, 2025
kr / shares
Dec. 31, 2024
EUR (€)
Mar. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Significant Events In The Reporting Period LineItems                
Impairment charge     € 7,500          
Nominal value per share | kr / shares         kr 1      
Share price | $ / shares       $ 53.15        
Equity     € (189,807)     € (105,706) € (238,179) € (145,697)
Share Repuchase Program [member] | American depository shares [member]                
Significant Events In The Reporting Period LineItems                
Payment for repurchase of shares   € 18,250            
Shares authorized to repurchase | shares     1,726,015          
VISEN [member]                
Significant Events In The Reporting Period LineItems                
Shares agreement description     additionally, certain significant shareholders of VISEN, including the Company, are subject to an additional lock-up obligation during the period commencing on the date that is six months after the IPO and ending on the date that is 12 months after the IPO during which such shareholders may not sell shares of VISEN to an extent that would cause such shareholder to cease being a controlling shareholder of VISEN pursuant to applicable listing rules.          
Present ownership percentage 39.20%              
Carrying amount of equity method investment     € 28,400          
Non-cash gain recognized € 33,600              
Equity     € 260,000