Property, plant and equipment - Additional Information (Detail) - EUR (€) € in Thousands  | 
6 Months Ended | 12 Months Ended | |||
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Jun. 30, 2022  | 
Jun. 30, 2021  | 
Dec. 31, 2021  | 
Dec. 31, 2020  | 
Dec. 31, 2019  | 
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| Impairment loss | € 545 | € 0 | € 354 | € 466 | € 272 | 
| Reversal of impairments loss | € 122 | € 0 | € 381 | € 0 | € 0 | 
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- Definition Text block. No definition available. 
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- Definition The amount of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Impairment loss recognised in profit or loss; Property, plant and equipment] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition The amount of reversal of impairment loss recognised in profit or loss for property, plant and equipment. [Refer: Reversal of impairment loss recognised in profit or loss; Property, plant and equipment] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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