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Inventories - Summary of Changes in the Provision for Slow Moving and Obsolete Raw Materials and Finished Products (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Classes of current inventories [abstract]    
Beginning balance € 8,464 € 9,172
Additions 1,564 212
Reductions (687) (920)
Ending balance € 9,341 € 8,464