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Financial Instruments - Fair Values and Risk Management - Summary of Trade Receivables Past Due (Detail) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about financial instruments [line items] |  |  |
Current trade receivables | € 29,187 | € 40,967 | € 37,549
Gross carrying amount [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current trade receivables | 37,886 | 50,594 |
Accumulated impairment [member] |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current trade receivables | (8,699) | (9,627) |
Current (not past due) |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current trade receivables | 15,179 | 24,251 |
From 1 to 29 days past due |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current trade receivables | 8,570 | 8,614 |
From 30 to 60 days past due |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current trade receivables | 1,298 | 1,409 |
From 61 to 90 days past due |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current trade receivables | 2,531 | 1,274 |
More than 90 days past due |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Current trade receivables | € 10,308 | € 15,046 |

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