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Adjusted Earnings Before Interest, Tax, Depreciation and Amortisation (Adjusted EBITDA) - Summary of Reconciliation of Adjusted EBITDA to Profit (Loss) (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reconciliation of consolidated adjusted EBITDA [abstract] |  |  |
Profit (Loss) for the year | € 33,119 | € (30,845) | [1]
Income tax expense | 7,429 | 2,886 | [1]
Profit / (loss) before tax | 40,548 | (27,959) | [1]
Adjustments for: |  |  |
Net finance income (costs) | (66,296) | 4,004 | [1]
Share of profit (loss) of equity-method investees | 290 |  |
Depreciation | 10,154 | 10,861 |
Amortisation | 910 | 1,569 |
Government grants | (1,061) | (1,068) |
Adjusted EBITDA | € (15,455) | € (12,593) |
[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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