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Flight Equipment held for sale (Details) - Aircraft Held For Sale $ in Millions	Sep. 30, 2020 aircraft	Dec. 31, 2019 USD ($) aircraft
Flight Equipment Held for Sale
Number of aircraft held for sale | aircraft	0	8
Assets held for sale | $		$ 249.6

X

- Definition

The number of aircraft held for sale by the entity.

+ References

No definition available.

+ Details

Name:	al_PropertyPlantAndEquipmentNumberOfAircraftHeldForSale
Namespace Prefix:	al_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=al_AircraftHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: