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Trade Receivables - Summary of Trade Receivables Disaggregated by Nature of Relations with Customers (Detail) - EUR (€) € in Thousands	Dec. 31, 2021	Dec. 31, 2020
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total trade receivables, net	€ 41,259	€ 33,934
Gross Carrying Amount [Member]
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total trade receivables, net	46,584	41,815
Gross Carrying Amount [Member] \| Third Parties [Member]
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total trade receivables, net	38,556	34,613
Gross Carrying Amount [Member] \| Related Party [Member]
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total trade receivables, net	8,028	7,202
Accumulated Impairment [Member]
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]
Total trade receivables, net	€ (5,325)	€ (7,881)