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Financial Instruments - Additional Information (Detail)	3 Months Ended	12 Months Ended
	Mar. 31, 2019 EUR (€) DerivativeContract	Dec. 31, 2018 DerivativeContract
Senior Notes
Financial Instrument At Fair Value [Line Items]
Debt instrument base principal amount	€ 1,000
Debt instrument estimated market price per €1000 principal amount	€ 954
Currency Forward Contracts
Financial Instrument At Fair Value [Line Items]
Number of derivative contacts outstanding | DerivativeContract	0	0

X

- Definition

Debt instrument base principal amount.

+ References

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+ Details

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X

- Definition

Debt instrument estimated market price per base principal amount.

+ References

No definition available.

+ Details

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- Definition

Financial instrument at fair value.

+ References

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- Definition

Number of derivative contracts outstanding.

+ References

No definition available.

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- Details

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X

- Details

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