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Changes in Significant Accounting Policies - Additional Information (Detail) - EUR (€) |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2021 | Jan. 01, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Redesignated Financial Assets And Liabilities [Line Items] |  |  |  |
Lease incentives |  |  | € 1,515,000 | € 1,799,000
IFRS 16 [member] |  |  |  |
Disclosure Of Redesignated Financial Assets And Liabilities [Line Items] |  |  |  |
Impact on retained earnings | € 0 | € 0 |  |
Lease incentives |  |  | € 1,515,000 | € 1,799,000

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