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Explanation of the Effects of Transition to International Financial Reporting Standards - Summary of Reconciliation Consolidated Shareholders Equity and Consolidated Economic Result (Detail) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | € 104,534 | € 143,999 |
Dividends distribution | (453) | (726) |
Profit / (loss) for the period | 33,119 | (30,845) | [1]
Other comprehensive loss for the period | 824 | (7,894) |
Equity, ending balance | 138,181 | 104,534 |
Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | 108,485 | 152,482 |
Profit / (loss) for the period |  | (31,852) |
Other comprehensive loss for the period |  | (11,419) |
Equity, ending balance |  | 108,485 |
Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | (3,951) | (8,483) |
Profit / (loss) for the period |  | 1,007 |
Other comprehensive loss for the period |  | 3,525 |
Equity, ending balance |  | (3,951) |
Share capital [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | 54,853 | 54,853 |
Dividends distribution |  |  |
Profit / (loss) for the period |  |  |
Other comprehensive loss for the period |  |  |
Equity, ending balance | 54,853 | 54,853 |
Share capital [member] | Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  | 54,853 |
Share capital [member] | Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  |  |
IFRS translation reserve [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | 5,055 | 12,606 |
Dividends distribution |  |  |
Profit / (loss) for the period |  |  |
Other comprehensive loss for the period | 227 | (7,551) |
Equity, ending balance | 5,282 | 5,055 |
IFRS translation reserve [member] | Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  | 4,980 |
IFRS translation reserve [member] | Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  | 7,626 |
IAS 19 reserve [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | (116) |  |
Dividends distribution |  |  |
Profit / (loss) for the period |  |  |
Other comprehensive loss for the period | 573 | (116) |
Equity, ending balance | 457 | (116) |
IAS 19 reserve [member] | Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  |  |
IAS 19 reserve [member] | Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  |  |
Other reserves [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | 11,459 | 11,459 |
Dividends distribution |  |  |
Profit / (loss) for the period |  |  |
Other comprehensive loss for the period |  |  |
Equity, ending balance | 11,459 | 11,459 |
Other reserves [member] | Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  | 11,459 |
Other reserves [member] | Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  |  |
Retained earnings [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | 31,244 | 61,636 |
Dividends distribution |  |  |
Profit / (loss) for the period | 33,289 | (30,392) |
Other comprehensive loss for the period |  |  |
Equity, ending balance | 64,496 | 31,244 |
Retained earnings [member] | Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  | 77,745 |
Retained earnings [member] | Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  | (16,109) |
Attributable to Owners of the Company [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | 102,495 | 140,554 |
Dividends distribution |  |  |
Profit / (loss) for the period | 33,289 | (30,392) |
Other comprehensive loss for the period | 800 | (7,667) |
Equity, ending balance | 136,547 | 102,495 |
Attributable to Owners of the Company [member] | Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | 106,446 | 149,037 |
Profit / (loss) for the period |  | (31,399) |
Equity, ending balance |  | 106,446 |
Attributable to Owners of the Company [member] | Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  | (8,483) |
Attributable to Non-controlling interests [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | 2,039 | 3,445 |
Dividends distribution | (453) | (726) |
Profit / (loss) for the period | (170) | (453) |
Other comprehensive loss for the period | 24 | (227) |
Equity, ending balance | 1,634 | 2,039 |
Attributable to Non-controlling interests [member] | Previous GAAP [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance | € 2,039 | 3,445 |
Profit / (loss) for the period |  | (453) |
Equity, ending balance |  | 2,039 |
Attributable to Non-controlling interests [member] | Effect of transition to IFRSs [member] |  |  |
Disclosure of comparative information prepared under previous GAAP [line items] |  |  |
Equity, beginning balance |  |  |
[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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