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Deferred Income for Government Grants - Summary of Changes in the Carrying Amount of Deferred Income for Government Grants (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Accruals And Deferred Income 1 [Abstract]    
Deferred income beginning balance € 12,458 € 13,869
Additions 1,725  
Reclassification to liabilities directly related to assets held for sale   (11)
Credit to profit or loss (1,429) (1,400)
Deferred income ending balance € 12,754 € 12,458