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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Impacts of IFRS Adjustments for Employee's Leaving Entitlement (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of comparative information prepared under previous GAAP [line items]      
Non current recognised liabilities defined benefit plan € 17,181 € 18,820 € 19,426
Previous GAAP [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Non current recognised liabilities defined benefit plan   17,210 17,791
Effect of transition to IFRSs [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Non current recognised liabilities defined benefit plan   1,610 1,635
IAS 19 adjustment - employees' leaving entitlement [member] | Effect of transition to IFRSs [member]      
Disclosure of comparative information prepared under previous GAAP [line items]      
Non current recognised liabilities defined benefit plan   € 1,610 € 1,635