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Net Investment in Sales-type Leases - Narrative (Details)	Sep. 30, 2025 engine aircraft	Dec. 31, 2024 aircraft engine
Leases [Abstract]
Sales-type lease, number of aircrafts | aircraft	16	15
Sales-type lease, number of engines | engine	1	1

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

- Definition

Lessor, Sales-type Lease, Number of Engines

+ References

No definition available.

+ Details

Name:	al_LessorSalesTypeLeaseNumberOfEngines
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