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Earnings Per Share - Summary of Earnings Per Share (Detail) - EUR (€)
€ / shares in Units, € in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per share [abstract]      
Net income of the reporting period € (147,693) € (114,531) € (44,674)
Adjusted weighted average number of outstanding shares 24,757,176 24,454,850 21,522,342
Basic / Diluted earnings per share (€/share) € (5.97) € (4.68) € (2.08)