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Expenses by Nature - Summary of Employee Benefit Expense (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Employee Benefit Expenses [Line Items]      
Labour costs € 15,578 € 19,060 € 20,023
Employee benefits expenses 107,592 129,051 134,622
Cost of sales [member]      
Disclosure Of Employee Benefit Expenses [Line Items]      
Labour costs 48,514 60,756 62,815
Social security contributions 12,138 17,251 18,310
Employees’ leaving entitlement 4,915 3,704 3,827
Other costs 6,370 4,498 4,875
Employee benefits expenses 71,937 86,209 89,827
Selling expenses [member]      
Disclosure Of Employee Benefit Expenses [Line Items]      
Labour costs 15,912 18,736 19,754
Social security contributions 3,059 3,800 4,019
Employees’ leaving entitlement 542 557 350
Other costs 564 689 649
Employee benefits expenses 20,077 23,782 24,772
Administrative expenses [member]      
Disclosure Of Employee Benefit Expenses [Line Items]      
Labour costs 11,272 13,725 14,585
Social security contributions 2,717 3,502 3,638
Employees’ leaving entitlement 605 664 635
Other costs 984 1,169 1,165
Employee benefits expenses € 15,578 € 19,060 € 20,023