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Financial Instruments - Fair Values and Risk Management - Summary of Information about Credit Risk Exposure on Trade Receivables Using a Provision Matrix (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure of credit risk exposure [line items] |  |  |  |
Total gross carrying amount | € 40,967 |  | € 37,549 | € 40,138
Gross carrying amount [member] |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Total gross carrying amount | 50,594 |  | € 48,324 | € 49,682
Credit risk [member] | Gross carrying amount [member] |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Outstanding trade receivables | 11,368 | € 12,739 |  |
Trade receivables subject to specific valuation | 39,226 | 35,585 |  |
Total gross carrying amount | 50,594 | 48,324 |  |
Expected credit loss | 64 | 37 |  |
Credit risk [member] | Less than Thirty days [member] | Gross carrying amount [member] |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Outstanding trade receivables | € 9,288 | € 11,661 |  |
Default rate | 0.10% | 0.11% |  |
Expected credit loss | € 9 | € 13 |  |
Credit risk [member] | Thirty to sixty days [member] | Gross carrying amount [member] |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Outstanding trade receivables | € 1,323 | € 651 |  |
Default rate | 0.99% | 1.04% |  |
Expected credit loss | € 13 | € 7 |  |
Credit risk [member] | Sixty One Days To Ninety Days [member] | Gross carrying amount [member] |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Outstanding trade receivables | € 88 | € 254 |  |
Default rate | 2.90% | 2.99% |  |
Expected credit loss | € 3 | € 8 |  |
Credit risk [member] | Past Due Greater Than Ninety One Days [member] | Gross carrying amount [member] |  |  |  |
Disclosure of credit risk exposure [line items] |  |  |  |
Outstanding trade receivables | € 669 | € 173 |  |
Default rate | 5.80% | 5.33% |  |
Expected credit loss | € 39 | € 9 |  |

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