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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
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Flight Equipment Held for Sale |  |
Number of aircraft held for sale | aircraft | 0 | 8
Assets held for sale | $ |  | $ 249.6

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- Definition The number of aircraft held for sale by the entity. + References No definition available. + Details
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Namespace Prefix: | al_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- 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_
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Balance Type: | debit
Period Type: | instant

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- 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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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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