Related Party Transactions - Additional Information (Detail)	12 Months Ended
Dec. 31, 2017 EUR (€)
Key management personnel [member]
Disclosure of transactions between related parties [Line Items]
Transactions involving key management personnel	€ 0

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

Name:	ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration