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Investments - Additional Information (Detail) - EUR (€) € in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Investment [Line Items]
Non-current investments	€ 12,319		€ 12,319		€ 16,945
Purchases of investments			30,551	€ 29,560
Proceeds from investment maturities			45,114	18,931
Foreign currency exchange gains		€ 6,917	871	€ 4,111
Foreign currency exchange losses	1,083
Mature in 12 months [member]
Investment [Line Items]
Non-current investments	6,500		6,500
Finance Income Expense [Member]
Investment [Line Items]
Foreign currency exchange gains	€ 400
Foreign currency exchange losses			€ 700

X

- Definition

The net gain arising from foreign exchange differences. [Refer: Foreign exchange gain (loss)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The net loss arising from foreign exchange differences. [Refer: Foreign exchange gain (loss)]

+ References

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- Definition

The amount of non-current held-to-maturity investments. [Refer: Held-to-maturity investments]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
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- Definition

The cash inflow from sales or maturity of financial instruments, classified as investing activities. [Refer: Financial instruments, class [member]]

+ References

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- Definition

The cash outflow for the purchase of financial instruments. [Refer: Financial instruments, class [member]]

+ References

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