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Impact of COVID-19 Pandemic (Details) - COVID 19 - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020
Unusual or Infrequent Item, or Both [Line Items]
Accommodation arrangement percentage of lessees		58.00%
Unrecognized rental revenue	$ 25.3
Percentage of lessees in fleet	6.60%

X

- Definition

The percentage of total lessee's that have received accommodation arrangements.

+ References

No definition available.

+ Details

Name:	al_LessorLeaseAccommodationArrangementsPercentage
Namespace Prefix:	al_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of lessees in the fleet by net book value whose rental revenue is not recognized.

+ References

No definition available.

+ Details

Name:	al_PercentageOfLesseesInFleet
Namespace Prefix:	al_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Rental revenue not recognized because of collection not reasonably assured for certain lessees.

+ References

No definition available.

+ Details

Name:	al_UnrecognizedRentalRevenue
Namespace Prefix:	al_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

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

X

- Details

Name:	us-gaap_UnusualOrInfrequentItemAxis=al_Covid19Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: