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Changes in Significant Accounting Policies - Summary of Impact on the consolidated statement of financial position (Detail) - EUR (€) € in Thousands | Jan. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure Of Quantitative Information About Rightofuse Asset And Lease Liabilities [Line Items] |  |  |
Right-of-use assets |  | € 54,718 | € 55,798
Lease liabilities |  | € (57,367) | € (56,758)
IFRS 16 [member] |  |  |
Disclosure Of Quantitative Information About Rightofuse Asset And Lease Liabilities [Line Items] |  |  |
Right-of-use assets | 56,758 |  |
Lease liabilities | (56,758) |  |
Decrease of right-of-use assets for lease incentives | (960) |  |
Decrease of other liabilities for lease incentives | € 960 |  |

X
- Definition The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 47 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard -URIDate 2019-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_53_j&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Schedule disclosing quantitative information about right-of-use asset and lease liabilities. + References No definition available. + Details
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- Definition Decrease of other liabilities for lease incentives. + References No definition available. + Details
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- Definition Decrease of right-of-use assets for lease incentives. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Details
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Period Type: |