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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Impacts of IFRS Adjustments for Inventories (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Inventories | € 84,227 | € 91,077 | € 91,014
Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Inventories |  | 80,273 | 78,384
Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Inventories |  | 10,804 | 12,630
Revenue of finished goods derecognised [member] | Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Inventories |  | € 10,804 | € 12,630

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