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Expenses by Nature - Summary of Depreciation and Amortization (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Depreciation And Amortization [line items] |  |
Depreciation | € 10,154 | € 10,861
Amortisation | 910 | 1,569
Government grants | (1,061) | (1,068)
Total depreciation and amortization | 10,003 | 11,362
Total depreciation and amortization | 10,003 | 11,361
Cost of sales [member] |  |
Disclosure Of Depreciation And Amortization [line items] |  |
Depreciation | 7,455 | 8,564
Amortisation | 34 | 74
Government grants | (1,061) | (1,068)
Total depreciation and amortization | 6,428 | 7,570
Selling expenses [member] |  |
Disclosure Of Depreciation And Amortization [line items] |  |
Depreciation | 2,274 | 1,818
Amortisation |  | 306
Total depreciation and amortization | 2,274 | 2,124
Administrative expenses [member] |  |
Disclosure Of Depreciation And Amortization [line items] |  |
Depreciation | 425 | 478
Amortisation | 876 | 1,190
Total depreciation and amortization | € 1,301 | € 1,668

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- Definition The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 23 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_23_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2018-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=8&date=2018-03-01&anchor=para_28_e&doctype=Standard -URIDate 2018-03-16 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2018-01-01 -Paragraph B13 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2018-03-01&anchor=para_B13_d&doctype=Appendix&seq=2 -URIDate 2018-03-16 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_102&doctype=Standard -URIDate 2018-03-16 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_104&doctype=Standard -URIDate 2018-03-16 + Details
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