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Intangible Assets and Goodwill - Summary of the Goodwill Breakdown by CGU (Detail) - EUR (€)
€ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Disclosure of information for cash-generating units [line items]    
Carrying amount of goodwill € 13,385 € 15,101
Nordics [Member]    
Disclosure of information for cash-generating units [line items]    
Carrying amount of goodwill 2,403 2,570
Electromaps Or Software [Member]    
Disclosure of information for cash-generating units [line items]    
Carrying amount of goodwill 3,457 3,457
Coil [Member]    
Disclosure of information for cash-generating units [line items]    
Carrying amount of goodwill 3,101 3,503
ARES [Member]    
Disclosure of information for cash-generating units [line items]    
Carrying amount of goodwill € 4,424 € 5,571