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Expenses by Nature - Summary of Employee Benefit Expense (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Employee Benefit Expenses [line items]      
Salary and wages € 19,060 € 20,023 € 19,364
Total 129,051 134,622 137,904
Cost of sales [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Salary and wages 60,756 62,815 57,401
Social security costs 17,251 18,310 18,854
Employees' leaving entitlement 3,704 3,827 3,710
Other costs 4,498 4,875 12,365
Total 86,209 89,827 92,330
Selling expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Salary and wages 18,736 19,754 20,475
Social security costs 3,800 4,019 4,376
Employees' leaving entitlement 557 350 660
Other costs 689 649 699
Total 23,782 24,772 26,210
Administrative expenses [member]      
Disclosure Of Employee Benefit Expenses [line items]      
Salary and wages 13,725 14,585 13,843
Social security costs 3,502 3,638 3,570
Employees' leaving entitlement 664 635 831
Other costs 1,169 1,165 1,120
Total € 19,060 € 20,023 € 19,364