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

Group information - Summary of Subsidiaries (Detail)

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Group information - Summary of Subsidiaries (Detail)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
FOROIL SAS      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 44.00% 44.00% 0.00%
3EA SAS      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 50.00% 50.00% 0.00%
Allego Holding B.V.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
Allego US Inc.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
Allego B.V.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego Innovations B.V.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego Employment B.V.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego GmbH      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego België B.V.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego France SAS      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego Charging Ltd      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego Denmark ApS      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego Portugal, Unipessoal Lda      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego Norway AS      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego Sweden AB      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego Italy S.R.L.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego Spain S.L.U.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 100.00%
Allego Charging Oy      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 0.00% 0.00%
Allego Switzerland GmbH      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 0.00% 0.00%
Allego Austria GmbH      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 0.00% 0.00%
Allego Latvia SIA      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 0.00% 0.00%
Allego Estonia OU      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 0.00% 0.00%
Allego Lithuania UAB      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 0.00% 0.00%
Allego Poland Sp. Z o.o      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 0.00% 0.00%
Faolan GmbH      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 0.00% 0.00%
Mega-E Charging B.V.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
FEMC Germany GmbH      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
Mega-E Netherlands Asset Co No 1 B.V.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
Mega-E Denmark Asset Co No 1 ApS      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
Mega-E Belgium Asset Co No 1 BV      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
Mega-E France SAS      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
Mega-E Sweden Asset Co No 1 AB      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
Mega-E Eastern Europe Holding B.V.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
Chamberra Sp. z.o.o.      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
GreenToWheel SAS      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 80.00% 80.00% 0.00%
Oury-Heintz Energie Applications SA      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
Modélisation, Mesures et Applications SA      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 100.00% 100.00% 0.00%
MOMA ASIA Ltd      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 0.00% 100.00% 0.00%
MOMA Collectivites SAS      
Disclosure of subsidiaries [line items]      
Interest in subsidiaries percentage 51.00% 51.00% 0.00%