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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - EUR (€)
€ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Cash and cash equivalents [abstract]        
Cash € 61,726 € 77,236    
Cash equivalent term deposits 45,539 45,534    
Total cash and cash equivalents as reported in the statement of financial position 107,265 122,770 € 202,245 € 137,880
Bank overdrafts 0 0    
Total net cash and cash equivalents as reported in the statement of cash flows € 107,265 € 122,770 € 202,245 € 137,880