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Share Capital, Reserves and Retained Earnings - Disclosure of Disaggregation of Changes of OCI (Detail) - EUR (€)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of Share Capital Reserves and Other Equity Interest [line items]      
Exchange difference on translation of foreign operations € 524,000 € 1,709,000 € (3,575,000)
Share of OCI of equity-method investees (784,000) 2,328,000 (373,000)
Actuarial losses on employees' leaving entitlement 2,309,000 (627,000) (212,000)
Total 2,049,000 3,410,000 (4,160,000)
Translation reserve [member]      
Disclosure of Share Capital Reserves and Other Equity Interest [line items]      
Exchange difference on translation of foreign operations 524,000 1,709,000 (3,575,000)
Share of OCI of equity-method investees (784,000) 2,328,000 (373,000)
Total 260,000 4,037,000 (3,948,000)
Remeasurement of defined benefit obligation [member]      
Disclosure of Share Capital Reserves and Other Equity Interest [line items]      
Actuarial losses on employees' leaving entitlement 2,309,000 (627,000) (212,000)
Total € 2,309,000 € (627,000) € (212,000)