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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

X

- Definition

Lease Premium

+ References

No definition available.

+ Details

Name:	aer_LeasePremium
Namespace Prefix:	aer_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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 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