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Share-Based Payments - Disclosure of Details of Breakdown of the Closing Balance BCE 2010 (Detail)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding 181,008 147,359 143,694  
Exercisable 181,008 147,359 53,859  
BCE2010 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding 11,005 12,339 15,974 29,972
Exercisable 11,005 12,339 15,974  
Exercise price, Exercisable € 77