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Tax credit and other receivables/Other payables - Summary Of Information About Offset Of Unrecognized Tax Losses (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Detailed Information Of Tax losses [Line Items]    
Unrecognized tax losses € 182,567 € 140,087
2015    
Disclosure Of Detailed Information Of Tax losses [Line Items]    
Unrecognized tax losses 47 47
2016    
Disclosure Of Detailed Information Of Tax losses [Line Items]    
Unrecognized tax losses 439 439
2017    
Disclosure Of Detailed Information Of Tax losses [Line Items]    
Unrecognized tax losses 56 56
2018    
Disclosure Of Detailed Information Of Tax losses [Line Items]    
Unrecognized tax losses 1,579 1,579
2019    
Disclosure Of Detailed Information Of Tax losses [Line Items]    
Unrecognized tax losses 3,318 3,318
2020    
Disclosure Of Detailed Information Of Tax losses [Line Items]    
Unrecognized tax losses 9,025 9,025
2021    
Disclosure Of Detailed Information Of Tax losses [Line Items]    
Unrecognized tax losses 122,456 122,456
2022    
Disclosure Of Detailed Information Of Tax losses [Line Items]    
Unrecognized tax losses 3,167 3,167
2023    
Disclosure Of Detailed Information Of Tax losses [Line Items]    
Unrecognized tax losses € 42,480 € 0