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Share-Based Payments - Disclosure of Details of Breakdown of the Closing Balance SO (Detail)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
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
Share Option [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 2,133,100 1,160,000 861,000
Exercisable 755,650 85,000  
Share Option [Member] | Exercise Price of Euro 7.57 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 471,000 471,000 471,000
Exercisable 471,000    
Exercise price, outstanding € 7.57 € 7.57 € 7.57
Exercise price, Exercisable € 7.57    
Share Option [Member] | Exercise Price of Euro 19.01 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 40,000 40,000 75,000
Exercisable 40,000 40,000  
Exercise price, outstanding € 19.01 € 19.01 € 19.01
Exercise price, Exercisable € 19.01 € 19.01  
Share Option [Member] | Exercise Price of Euro 48.90 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 120,000 120,000 120,000
Exercisable 75,000 45,000  
Exercise price, outstanding € 48.90 € 48.90 € 48.90
Exercise price, Exercisable € 48.90 € 48.90  
Share Option [Member] | Exercise Price of Euro 66.06 [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 170,000 170,000 195,000
Exercisable 85,000    
Exercise price, outstanding € 66.06 € 66.06 € 66.06
Exercise price, Exercisable € 66.06    
Share Option [Member] | Exercise Price of Euro 65.68 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 75,000 75,000  
Exercisable 18,750    
Exercise price, outstanding € 65.68 € 65.68  
Exercise price, Exercisable € 65.68    
Share Option [Member] | Exercise Price of Euro 62.82 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 33,000 33,000  
Exercisable 8,250    
Exercise price, outstanding € 62.82 € 62.82  
Exercise price, Exercisable € 62.82    
Share Option [Member] | Exercise Price of Euro 59.04 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 22,000 22,000  
Exercisable 5,500    
Exercise price, outstanding € 59.04 € 59.04  
Exercise price, Exercisable € 59.04    
Share Option [Member] | Exercise Price of Euro 53.96 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 101,300 110,000  
Exercisable 24,425    
Exercise price, outstanding € 53.96 € 53.96  
Exercise price, Exercisable € 53.96    
Share Option [Member] | Exercise Price of Euro 62.24 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 10,000 10,000  
Exercisable 2,500    
Exercise price, outstanding € 62.24 € 62.24  
Exercise price, Exercisable € 62.24    
Share Option [Member] | Exercise Price of Euro 62.80 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 9,300 9,300  
Exercisable 2,325    
Exercise price, outstanding € 62.80 € 62.80  
Exercise price, Exercisable € 62.80    
Share Option [Member] | Exercise Price of Euro 64.39 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 9,300 16,500  
Exercisable 2,325    
Exercise price, outstanding € 64.39 € 64.39  
Exercise price, Exercisable € 64.39    
Share Option [Member] | Exercise Price of Euro 68.33 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 8,300 8,300  
Exercisable 2,075    
Exercise price, outstanding € 68.33 € 68.33  
Exercise price, Exercisable € 68.33    
Share Option [Member] | Exercise Price of Euro 69.75 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 72,900 74,960  
Exercisable 18,225    
Exercise price, outstanding € 69.75 € 69.75  
Exercise price, Exercisable € 69.75    
Share Option [Member] | Exercise price of Euro 66.35 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 1,100    
Exercisable 275    
Exercise price, outstanding € 66.35    
Exercise price, Exercisable € 66.35    
Share Option [Member] | Exercise price of Euro 66.11 [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 19,100    
Exercise price, outstanding € 66.11    
Share Option [Member] | Exercise price of Euro 66.25 [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 7,200    
Exercise price, outstanding € 66.25    
Share Option [Member] | Exercise price of Euro 60.77 [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 16,500    
Exercise price, outstanding € 60.77    
Share Option [Member] | Exercise price of Euro 59.05 [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 118,500    
Exercise price, outstanding € 59.05    
Share Option [Member] | Exercise price of Euro 60.54 [Member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 111,600    
Exercise price, outstanding € 60.54    
Share Option [Member] | Exercise price of Euro 71.61 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 30,900    
Exercise price, outstanding € 71.61    
Share Option [Member] | Exercise price of Euro 74.22 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 52,600    
Exercise price, outstanding € 74.22    
Share Option [Member] | Exercise price of Euro 39.00 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 625,200    
Exercise price, outstanding € 39.00    
Share Option [Member] | Exercise price of Euro 38.18 [member]      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Outstanding 8,300    
Exercise price, outstanding € 38.18