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Leases - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) Lease	Dec. 31, 2023 USD ($)
Lessee Lease Description [Line Items]
Assets recorded under finance leases, net of accumulated depreciation	$ 43.6	$ 37.6
Undiscounted future lease payments pertaining to leases that were executed but not yet commenced	$ 1.5
Lease term	10 years
Number of operating lease with related party | Lease	1
Minimum
Lessee Lease Description [Line Items]
Remaining lease terms	1 year
Maximum
Lessee Lease Description [Line Items]
Additional lease renewal terms	20 years

X

- Definition

Finance lease assets net of accumulated depreciation.

+ References

No definition available.

+ Details

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Namespace Prefix:	altg_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Lease renewal term.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Operating lease with related party.

+ References

No definition available.

+ Details

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Namespace Prefix:	altg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Remaining lease term.

+ References

No definition available.

+ Details

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Namespace Prefix:	altg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Undiscounted future lease payments pertaining to leases that were executed but not yet commenced.

+ References

No definition available.

+ Details

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Namespace Prefix:	altg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-3

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Details

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