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Financial Instruments - Fair Values and Risk Management - Summary of Maturity Profile of Financial Liabilities Based on Contractual Undiscounted Payments (Detail) - EUR (€) € in Thousands | Dec. 31, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Disclosure Of Maturity Analysis For Financial Liabilities [line items] |  |  |
Long-term borrowings | € 20,943 | € 25,717 | € 17,961
Bank overdraft and short-term borrowings | 35,148 | 25,967 | 24,427
Trade and other payables | 104,815 | 103,622 | 99,864
Losses on derivative financial instruments | 320 | 267 | 1,293
Total financial liabilities | 161,226 | 155,573 | 143,545
Not later than two months [member] |  |  |
Disclosure Of Maturity Analysis For Financial Liabilities [line items] |  |  |
Long-term borrowings | 860 | 314 | 659
Bank overdraft and short-term borrowings | 35,148 | 25,967 | 24,427
Trade and other payables | 26,914 | 27,587 | 29,407
Losses on derivative financial instruments | 320 | 267 | 1,293
Total financial liabilities | 63,242 | 54,135 | 55,786
Later than two months and not later than twelve months [member] |  |  |
Disclosure Of Maturity Analysis For Financial Liabilities [line items] |  |  |
Long-term borrowings | 9,722 | 4,526 | 10,973
Trade and other payables | 77,901 | 76,035 | 70,457
Total financial liabilities | 87,623 | 80,561 | 81,430
2020 [member] |  |  |
Disclosure Of Maturity Analysis For Financial Liabilities [line items] |  |  |
Long-term borrowings | 3,177 | 10,576 | 2,853
Total financial liabilities | 3,177 | 10,576 | 2,853
Between 2 and 5 years [member] |  |  |
Disclosure Of Maturity Analysis For Financial Liabilities [line items] |  |  |
Long-term borrowings | 5,381 | 7,455 | 3,476
Total financial liabilities | 5,381 | 7,455 | € 3,476
Later than five years [member] |  |  |
Disclosure Of Maturity Analysis For Financial Liabilities [line items] |  |  |
Long-term borrowings | 1,803 | 2,846 |
Total financial liabilities | € 1,803 | € 2,846 |

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