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Inventories - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Inventory Disclosure [Abstract] |  |  |  |  |
Capitalized direct labor expense included in work in process | $ 1.5 |  | $ 1.5 |  | $ 0.6
Rental depreciation expense under short-term leases with purchase options | $ 3.4 | $ 4.0 | $ 6.2 | $ 7.1 |

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- Definition Capitalized direct labor expense included in work in process. + References No definition available. + Details
Name: | altg_CapitalizedDirectLaborExpenseIncludedInWorkInProcess
Namespace Prefix: | altg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Rental depreciation expense. + References No definition available. + Details
Name: | altg_RentalDepreciationExpense
Namespace Prefix: | altg_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_InventoryDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration