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Shareholders' Equity - Summary of Reconciliation of RSU's (Detail)
6 Months Ended
Jun. 30, 2018
EUR (€)
shares
Disclosure of terms and conditions of share-based payment arrangement [abstract]  
Outstanding beginning balance | € € 20.03
Forfeited during the six month period | € 0
Vested during the six month period | € 20.03
Granted during the six month period | € 0
Outstanding ending balance | € € 20.03
Outstanding beginning balance | shares 194,546
Forfeited during the six month period | shares 0
Vested during the six month period | shares (76,245)
Granted during the six month period | shares 0
Outstanding ending balance | shares 118,301