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Maintenance rights intangible and lease premium, net (Movements in maintenance rights intangible) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Finite-lived Intangible Assets [Roll Forward] |  |
Maintenance rights intangible at beginning of period | $ 2,117,034 |
Maintenance rights intangible at end of period | 1,464,599 | $ 2,117,034
Maintenance Rights Intangible [Member] |  |
Finite-lived Intangible Assets [Roll Forward] |  |
Maintenance rights intangible at beginning of period | 2,117,034 | 3,068,318
EOL and MR contract maintenance rights expense | (355,845) | (381,637)
MR contract maintenance rights write-off due to maintenance liability release | (77,494) | (173,971)
EOL contract maintenance rights write-off due to cash receipt | (106,433) | (96,503)
EOL and MR contract intangible write-off due to sale of aircraft | (112,663) | (284,411)
Transfer to other assets | 0 | (17,162)
Additions due to aircraft acquisitions | 0 | 2,400
Maintenance rights intangible at end of period | $ 1,464,599 | $ 2,117,034

X
- Definition Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for end of lease (EOL) and maintenance reserve (MR) contract intangible write off due to sale of aircraft. + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for end of lease (EOL) and maintenance reserve (MR) contract maintenance rights expense. + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
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X
- Definition Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for end of lease (EOL) contract cash receipt. + References No definition available. + Details
Name: | aer_FiniteLivedIntangibleAssetsEndOfLeaseContractCashReceipt
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease to assets, excluding financial assets and goodwill, lacking physical substance with a finite life for maintenance reserve (MR) contract maintenance rights write off due to maintenance liability release. + References No definition available. + Details
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Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- 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, Additions + References No definition available. + Details
Name: | aer_MaintenanceRightsIntangibleAdditions
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Maintenance Rights Intangible, Transfer To Lease Incentive + References No definition available. + Details
Name: | aer_MaintenanceRightsIntangibleTransferToLeaseIncentive
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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