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(Maintenance rights and lease premium, net) (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Goodwill and Intangible Assets Disclosure [Abstract] |  |
Maintenance rights | $ 938,452 | $ 1,088,246
Lease premium, net | 19,755 | 24,944
Maintenance rights and lease premium, net | $ 958,207 | $ 1,113,190

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- Definition Lease Premium + References No definition available. + Details
Name: | aer_LeasePremium
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Maintenance Rights Intangible + References No definition available. + Details
Name: | aer_MaintenanceRightsIntangible
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Maintenance Rights Intangible And Lease Premium, Net + References No definition available. + Details
Name: | aer_MaintenanceRightsIntangibleAndLeasePremiumNet
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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