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Share-Based Payments - Schedule of Breakdown of the Closing Balance (Detail)	Dec. 31, 2017 $ / shares
Bons de souscriptiond actions two thousand ten [Member] | Exercise price 65 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	$ 65
Bons de souscriptiond actions two thousand ten [Member] | Exercise price 5.13 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	5.13
Bons de souscriptiond actions two thousand ten [Member] | Exercise price 8.59 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	8.59
Bons de souscriptiond actions two thousand ten [Member] | Exercise price 8.1 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	8.1
Bons de souscriptiond actions two thousand ten [Member] | Exercise price18.79 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	18.79
BSA [Member] | Exercise price 43.00 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	43
BSA [Member] | Exercise price 66.06 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	66.06
BSA [Member] | Exercise price 64.14 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	64.14
BSA [Member] | Exercise price 52.97 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	52.97
BSA [Member] | Exercise price 69.75 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	69.75
BSA [Member] | Exercise price 59.05 [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Exercise price	$ 59.05

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Exercise price of other equity instruments outstanding in sharebased payment arrangement.

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- Definition

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.

+ References

No definition available.

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