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Lease liabilities (non-current and current) - Additional information (Detail) - EUR (€)
€ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]    
Increase (decrease) in lease liability € 19,289 € 20,709
COVID-19-related rent concessions € 1,799  
Bottom Of Range [Member]    
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]    
Borrowings interest rate 3.00% 3.00%
Top of range [member]    
Disclosure of Non Current and Current Portion of the Lease Liabilities [Line Items]    
Borrowings interest rate 12.00% 12.00%