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Shareholders' Equity - Summary of Reconciliation of Outstanding Share Options (Detail)
6 Months Ended
Jun. 30, 2019
EUR (€)
shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]  
Outstanding at January 1 | shares 2,633,039
Forfeited during the six months | shares (223,631)
Expired during the six months | shares (126,589)
Exercised during the six months | shares (9,980)
Granted during the six months | shares 1,009,671
Outstanding at June 30 | shares 3,282,510
Exercisable at June 30 | shares 1,533,094
Outstanding at January 1 | € € 14.62
Forfeited during the six months | € 14.07
Expired during the six months | € 15.95
Exercised during the six months | € 11.02
Granted during the six months | € 10.23
Outstanding at June 30 | € 13.27
Exercisable at June 30 | € € 13.34