Share-Based Payments - Additional Information (Detail) - EUR (€)	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price of stock options	€ 34.07
Number of ordinary shares issued	3,712,444
Potential shares resulting from definitive acquistion of free shares	644,295
IFRS 2 Share-based payments [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Share based payment expense	€ 8,000,000	€ 16,800,000
BSA [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Description of warrants and stock options vesting period	The warrants and stock options granted may be exercised at any time after a vesting period of between 0 and 4 years and become null and void after a period of 10 years from the date they are granted.
Warrants and stock options expiration period	10 years
BSA [member] \| CEO and US [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Stock options vesting period	4 years
Number of free shares granted	721,000
Stock options forfeited period	10 years
BSA [member] \| One year [Member] \| CEO and US [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Stock options vesting percentage	25.00%
BSA [member] \| Six months [member] \| CEO and US [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Stock options vesting percentage	12.50%
BSA [member] \| Bottom of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Stock options vesting period	0 years
BSA [member] \| Bottom of range [member] \| CEO and US [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price of stock options	€ 14.58
BSA [member] \| Top of range [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Stock options vesting period	4 years
BSA [member] \| Top of range [member] \| CEO and US [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price of stock options	€ 16.99
One free share plan [member] \| French employees [member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of free shares granted	100,000
Free shares retention period	2 years

Potential shares resulting from definitive acquisition of free shares.

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- Definition

Share based payment arrangement forfeited period.

+ References

No definition available.

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- Definition

Share based payment arrangement retention period.

+ References

No definition available.

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- Definition

Share based payment arrangement vesting period.

+ References

No definition available.

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- Definition

Share Based Payment Expense.

+ References

No definition available.

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- Definition

Share-based payment arrangement options granted expiration period.

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- Definition

Share-based payment arrangement vesting rights percentage.

+ References

No definition available.

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- Definition

The description of the vesting requirements for a type of share-based payment arrangement that existed at any time during the period. An entity with substantially similar types of share-based payment arrangements may aggregate this information. [Refer: Share-based payment arrangements [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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.

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No definition available.

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- Definition

The number of share options granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Paragraph 106
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- Definition

The weighted average exercise price of other equity instruments (ie other than share options) granted in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

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