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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: |