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Share-Based Payments - Schedule of Breakdown of the Closing Balance (Detail) | Dec. 31, 2017 $ / shares
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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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