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Net Investment in Sales-type Leases - Narrative (Details) - aircraft | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Leases [Abstract] |  |
Sales-type lease, number of aircrafts | 13 | 12

X
- Definition Lessor, Sales-type Lease, Number of Aircraft + References No definition available. + Details
Name: | al_LessorSalesTypeLeaseNumberOfAircraft
Namespace Prefix: | al_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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