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Earnings/(loss) per share - Summary of Basic and Diluted Earnings (Losses) per Share (Detail) - € / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Weighted average number of ordinary shares 54,853,045 54,853,045 54,853,045
Basic earnings/(loss) per share € (0.45) € (0.61) € 0.61
Diluted earnings/(loss) per share € (0.45) € (0.61) € 0.61