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Bank Overdraft and Short-term Borrowings - Additional Information (Detail) - EUR (€)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2017
Disclosure of detailed information about borrowings [abstract]
Credit facility available	€ 138,220,000	€ 147,720,000	€ 117,773,000
Unused credit facility	24,010,000	€ 33,103,000	€ 34,451,000
Commitment fee	€ 0

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- References

No definition available.

+ Details

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- Definition

The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2018-01-01
-Paragraph 50
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=para_50_a&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Definition

Commitment fee incurred.

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No definition available.

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- Definition

Credit Facility Available Amount

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant