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Derivative Financial Instruments - Additional information (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Change in value of forward elements of forward contracts [abstract]
Net unrealized expense (gain)	€ 102	€ (72)

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- Definition

Adjustments for unrealised foreign exchange losses (gains) Debt Securities

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