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Earnings Per Share - Summary of Earnings Per Share Attributable to the Equity Holders (Detail) - € / shares
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings per share [abstract]      
Basic € (0.28) € (0.04) € (5.27)
Diluted € (0.28) € (0.04) € (5.27)