XML 173 R163.htm IDEA: XBRL DOCUMENT v3.19.1
Revenue - Summary of Information About Receivables, Contract Assets And Contract Liabilities From Contracts With Customers (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Receivables from contracts with customers [abstract]      
Trade receivables € 40,967 € 37,549 € 40,138
Contract liabilities € 22,099 € 15,533 € 12,299