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Expenses by Nature - Summary of Employee Benefit Expense (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Employee Benefit Expenses [line items]    
Salary and wages € 20,023 € 19,364
Total 137,425 141,433
Cost of sales [member]    
Disclosure Of Employee Benefit Expenses [line items]    
Salary and wages 62,815 57,401
Social security costs 18,310 18,854
Employees' leaving entitlement 3,827 3,710
Other costs 4,881 12,342
Total 89,833 92,307
Selling expenses [member]    
Disclosure Of Employee Benefit Expenses [line items]    
Salary and wages 19,754 20,475
Social security costs 4,019 4,376
Employees' leaving entitlement 350 660
Other costs 3,472 1,064
Total 27,595 26,575
Administrative expenses [member]    
Disclosure Of Employee Benefit Expenses [line items]    
Salary and wages 14,585 13,843
Social security costs 3,638 3,570
Employees' leaving entitlement 635 831
Other costs 1,139 4,307
Total € 19,997 € 22,551