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Financial risk management - Disclosure of reconciliation of the group's cash net of debt to total consolidated equity (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary of reconciliation of the Groups cash net of debt to total consolidated equity [Line Items]        
Cash net of debt € (58,264) € (21,887)    
Total equity 300,806 290,826 € 250,395 € 323,467
Total capital € 242,542 € 268,939    
Gearing ratio (24.00%) (8.00%)