Other financial assets - Summary of Other financial assets (Detail) - EUR (€) € in Thousands  | 
Jun. 30, 2022  | 
Dec. 31, 2021  | 
Dec. 31, 2020  | 
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| Disclosure of Other financial assets [Line Items] | |||
| Other financial assets | € 64,615 | € 49,982 | € 16,426 | 
| Non-current | 64,615 | 19,582 | 16,426 | 
| Current | 0 | 30,400 | 0 | 
| Pledged bank balances [Member] | |||
| Disclosure of Other financial assets [Line Items] | |||
| Other financial assets | 19,877 | 18,887 | 16,324 | 
| Derivatives [Member] | |||
| Disclosure of Other financial assets [Line Items] | |||
| Other financial assets | 2,754 | 31,095 | € 102 | 
| Investments in equity securities [Member] | |||
| Disclosure of Other financial assets [Line Items] | |||
| Other financial assets | € 41,984 | € 0 | 
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- Definition Disclosure of other financial assets. No definition available. 
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- Definition The amount of current financial assets that the entity does not separately disclose in the same statement or note. [Refer: Other financial assets; Current financial assets] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition The amount of financial assets that the entity does not separately disclose in the same statement or note. [Refer: Financial assets] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Definition The amount of non-current financial assets that the entity does not separately disclose in the same statement or note. [Refer: Other financial assets] Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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