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Income Tax Expense - Additional Information (Detail) - 12 months ended Dec. 31, 2017 € in Millions | EUR (€) | USD ($)
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Disclosure of reconciliation of effective and applicable income tax expenses [line items] |  |
Deferred tax assets | $ |  | $ 0
Amount of losses carried forward | € 369 |
Parent [member] |  |
Disclosure of reconciliation of effective and applicable income tax expenses [line items] |  |
Amount of losses carried forward | € 334 |
French (Member) |  |
Disclosure of reconciliation of effective and applicable income tax expenses [line items] |  |
Effective income tax rate | 33.33% |

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