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Inventories - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Inventory Disclosure [Abstract] |  |  |
Capitalized direct labor expense included in work in process | $ 1.8 |  | $ 1.3
Rental depreciation expense under short-term leases with purchase options | $ 3.6 | $ 2.8 |

X
- 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

X
- 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