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Share-Based Payments - Schedule of Breakdown of the Closing Balance BSA (Detail)
Dec. 31, 2017
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  
Bons de souscriptiond actions two thousand ten [Member] | Exercise price 65 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding   859 859  
Exercisable   859 859  
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]        
Outstanding     89,835  
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]        
Outstanding 7,500 10,000 10,000  
Exercisable 7,500 10,000 10,000  
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]        
Outstanding 9,500 13,000 13,000  
Exercisable 9,500 13,000 13,000  
Bons de souscriptiond actions two thousand ten [Member] | Exercise price18.79 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding 2,500 5,000 5,000  
Exercisable 2,500 5,000 5,000  
BSA [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding 181,008 147,359 143,694 196,480
BSA [Member] | Exercise price 43.00 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding 10,000 10,000 10,000  
Exercisable 10,000 10,000 10,000  
BSA [Member] | Exercise price 66.06 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding 15,000 15,000 15,000  
Exercisable 15,000 15,000 15,000  
BSA [Member] | Exercise price 64.14 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding 73,500 73,500    
Exercisable 73,500 73,500    
BSA [Member] | Exercise price 52.97 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding 20,000 20,000    
Exercisable 20,000 20,000    
BSA [Member] | Exercise price 69.75 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding 34,008      
Exercisable 34,008      
BSA [Member] | Exercise price 59.05 [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Outstanding 9,000      
Exercisable 9,000