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Income Tax Expense - Summary of Tax Loss Carry Forward (Detail) - EUR (€) € in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 399,821 | € 393,630
No expiration [member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | 339,563 | 328,650
Not More than Five Years [Member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 26,180 | € 25,647
Expiration Date | 2020-2024 | 2019-2023
More than Five Years [Member] |  |
Disclosure Of Tax Loss Carryforwards [line items] |  |
Total | € 34,078 | € 39,333
Expiration Date | 2024 | 2023

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