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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash and cash equivalents [abstract]        
Cash € 32,054 € 146,374 € 178,895  
Cash equivalent term deposits 105,826 110,100 144,486  
Total cash and cash equivalent as reported in statement of financial position 137,880 256,473 323,381 € 114,555
Bank overdrafts 0 0 0  
Total net cash and cash equivalents as reported in the statement of cash flow € 137,880 € 256,473 € 323,381 € 114,555