Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Borrowings - Summary of Breakdown of Borrowings (Detail)

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Borrowings - Summary of Breakdown of Borrowings (Detail) - EUR (€)
€ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]    
Borrowings € 213,128 € 159,610
Senior Debt [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 5.00%  
Borrowings, maturity May 27, 2026  
Borrowings € 112,935 67,579
Shareholder Loans [Member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings, interest rate 9.00%  
Borrowings, maturity 2035  
Borrowings € 100,193 € 92,031
Shareholder Loans [Member] | Bottom of range [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings, maturity May 31, 2035  
Shareholder Loans [Member] | Top of range [member]    
Disclosure of detailed information about borrowings [line items]    
Borrowings, maturity November 30, 2035