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Expenses by Nature - Summary of Expenses by Nature (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Expense By Nature [Abstract]      
Changes in inventories € 5,776 € 14,542 € 6,850
Purchases of raw materials 105,643 122,728 158,172
Purchases of finished products 15,161 16,477 19,419
Services costs 68,613 91,526 107,074
Employee benefits expenses 107,592 129,051 134,622
Depreciation and amortization, net of government grants 22,924 23,487 10,003
Other 13,404 13,396 22,451
Total cost of sales, selling and administrative expenses € 339,113 € 411,207 € 458,591