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Earnings/(losses) per share - Summary of Basic and Diluted Earnings (Losses) per Share (Detail) - € / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings per share [abstract]      
Weighted average number of ordinary shares 54,853,045 54,853,045 54,853,045
Basic earnings/(losses) per share € (0.61) € 0.61 € (0.55) [1]
Diluted earnings/(losses) per share € (0.61) € 0.61 € (0.55) [1]
[1] The Group has initially applied IFRS 9 as at January 1, 2018. Under the transition method chosen, comparative information has not been restated except for separately presenting impairment losses on trade receivables. See note 5(c).