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Shareholders' Equity - Summary of Reconciliation of Outstanding Share Options (Detail)
 6 Months Ended
Jun. 30, 2018
shares
€ / shares
Jun. 30, 2017
shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]    
Outstanding at January 1 | shares 2,213,985  
Forfeited during the six-month period | shares (12,044)  
Expired during the six-month period | shares (5,146)  
Exercised during the six-month period | shares (34,041) (110,869)
Granted during the six-month period | shares 469,068  
Outstanding at June 30 | shares 2,631,822  
Exercisable at June 30 | shares 1,105,059  
Outstanding at January 1 | € / shares € 13.99  
Forfeited during the six-month period | € / shares 19.67  
Expired during the six-month period | € / shares 14.02  
Exercised during the six-month period | € / shares 1.93  
Granted during the six-month period | € / shares 14.68  
Outstanding at June 30 | € / shares 14.24  
Exercisable at June 30 | € / shares € 12.18