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Right-of-use-assets - Summary of Breakdown of Right-of-use Assets Based on Geographical Location (Detail) - EUR (€) € in Thousands | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
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Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | € 50,444 | € 42,825 | € 50,755
United States of America [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 25,901 | 18,938 |
Italy [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 12,523 | 9,249 |
Spain [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 2,548 | 3,473 |
United Kingdom [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 6,126 | 4,985 |
China [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | 417 | 2,493 |
Other countries [member] |  |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |  |
Right-of-use assets | € 2,929 | € 3,687 |

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. 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 2023-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_j&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_a&doctype=Standard -URIDate 2023-03-23 + Details
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