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Explanation of the Effects of Transition to International Financial Reporting Standards - Schedule of Reconciling ITA GAAP and IFRS Consolidated Statement of Cash Flows (Parenthetical) (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of comparative information prepared under previous GAAP [abstract]      
Bank overdrafts repayable on demand € 1,762 € 0 € 4,416