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LEASE RENTAL REVENUES AND AIRCRAFT AND ENGINES HELD FOR LEASE - Components of Aircraft and engines held for operating leases, net (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
LEASE RENTAL REVENUES AND AIRCRAFT AND ENGINES HELD FOR LEASE |  |  |  |  |
Aircraft and engines held for operating leases | $ 210,593 |  | $ 210,593 |  | $ 228,942
Less accumulated depreciation | (135,694) |  | (135,694) |  | (142,098)
Aircraft and engines held for operating lease | 74,899 |  | 74,899 |  | $ 86,844
Depreciation | 2,200 | $ 5,400 | 4,600 | $ 12,500 |
Supplemental rents recognized as revenue | $ 1,800 | $ 2,100 | $ 2,900 | $ 7,600 |
Term of lease | 3 years |  | 3 years |  |

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- Definition Amount of accumulated depreciation and amortization from property, plant, and equipment underlying asset under operating lease. + References No definition available. + Details
Name: | asle_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipmentUnderlyingAssetUnderOperatingLease
Namespace Prefix: | asle_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition " The amount of expense recognized in the current period that reflects the allocation of the cost of property, plant, and equipment underlying asset under operating lease, over the assets' useful lives." + References No definition available. + Details
Name: | asle_DepreciationPropertyPlantAndEquipmentUnderlyingAssetUnderOperatingLease
Namespace Prefix: | asle_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount, before accumulated depreciation and amortization, of property, plant, and equipment underlying asset under operating lease. + References No definition available. + Details
Name: | asle_PropertyPlantAndEquipmentUnderlyingAssetUnderOperatingLeaseBeforeAccumulatedDepreciationDepletionAndAmortization
Namespace Prefix: | asle_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Definition Term of lessor'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 -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=121576215&loc=SL77919359-209981 + Details
Name: | us-gaap_LessorOperatingLeaseTermOfContract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
Name: | us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of contingent rental revenue recognized for the period under lease, based on the occurrences of an event or condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121578510&loc=d3e41551-112718 + Details
Name: | us-gaap_OperatingLeasesIncomeStatementContingentRevenue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration