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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, 2020
Dec. 31, 2019
Accruals And Deferred Income [Abstract]    
Deferred income beginning balance € 13,869 € 13,002
Additions   2,493
Reclassification to liabilities directly related to assets held for sale (11)  
Credit to profit or loss (1,400) (1,626)
Deferred income ending balance € 12,458 € 13,869