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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Effects of IFRS Adjustments on Income Tax Expense (Detail) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Effects of IFRS adjustments on income tax expense | € (7,556) | € (3,817) |
Effects of IFRS adjustments on deferred income tax expense | 127 | 931 |
Total | (7,429) | (2,886) | [1]
Domestic [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Effects of IFRS adjustments on income tax expense | (4,504) | (40) |
Effects of IFRS adjustments on deferred income tax expense | 270 | (310) |
Foreign [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Effects of IFRS adjustments on income tax expense | (3,052) | (3,777) |
Effects of IFRS adjustments on deferred income tax expense | € (143) | 1,241 |
Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Effects of IFRS adjustments on income tax expense |  | (3,817) |
Effects of IFRS adjustments on deferred income tax expense |  | 1,241 |
Total |  | (2,576) |
Previous GAAP [member] | Domestic [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Effects of IFRS adjustments on income tax expense |  | (40) |
Previous GAAP [member] | Foreign [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Effects of IFRS adjustments on income tax expense |  | (3,777) |
Effects of IFRS adjustments on deferred income tax expense |  | 1,241 |
Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Effects of IFRS adjustments on deferred income tax expense |  | (310) |
Total |  | (310) |
Effect of transition to IFRSs [member] | Domestic [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Effects of IFRS adjustments on deferred income tax expense |  | € (310) |
[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.

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