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Financial Instruments - Fair Values and Risk Management - Summary of Changes in Liabilities Arising from Financing Activities (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | € 56,411 | € 51,951 | € 43,681
Cash flows |  | 4,407 | 9,296
Changes in fair value |  | 53 | (1,026)
Ending balance |  | 56,411 | 51,951
Long-term borrowings [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 20,943 | 25,717 | 17,961
Cash flows | (1,365) | (4,774) | 7,756
Other changes | (1,166) |  |
Ending balance | 18,412 | 20,943 | 25,717
Lease liabilities [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 56,758 |  |
Cash flows | (11,960) |  |
Other changes | 12,569 |  |
Ending balance | 57,367 | 56,758 |
Bank Overdrafts and Short Term Borrowings [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 35,148 | 25,967 | 24,427
Cash flows | (10,978) | 9,181 | 1,540
Ending balance | 24,170 | 35,148 | 25,967
Losses on derivative financial instruments [member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 320 | 267 | 1,293
Changes in fair value | 452 | 53 | (1,026)
Ending balance | 772 | 320 | € 267
Adjusted balance due to lease liability [Member] |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance | 113,169 |  |
Cash flows | (24,303) |  |
Changes in fair value | 452 |  |
Other changes | 11,403 |  |
Ending balance | € 100,721 | € 113,169 |

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- Definition The increase (decrease) in liabilities arising from financing activities resulting from changes in fair values. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44B -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44B -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44B_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 44D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2019-en-r&anchor=para_44D&doctype=Standard -URIDate 2019-03-27 + Details
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