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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.