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Income Tax Expense - Summary of Tax Loss Carry Forward (Detail)
€ in Thousands
Dec. 31, 2018
EUR (€)
Disclosure Of Tax Loss Carryforwards [line items]  
Total € 393,630
Within 1 year [member]  
Disclosure Of Tax Loss Carryforwards [line items]  
Total 2,833
2020 [member]  
Disclosure Of Tax Loss Carryforwards [line items]  
Total 5,368
2021 [member]  
Disclosure Of Tax Loss Carryforwards [line items]  
Total 6,586
2022 [member]  
Disclosure Of Tax Loss Carryforwards [line items]  
Total 4,051
2023 [member]  
Disclosure Of Tax Loss Carryforwards [line items]  
Total 6,809
Later than five years [member]  
Disclosure Of Tax Loss Carryforwards [line items]  
Total 39,333
No expiration [member]  
Disclosure Of Tax Loss Carryforwards [line items]  
Total € 328,650