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Commitments and contingencies (Movements in prepayments on flight equipment) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Deposits on Flight Equipment [Roll Forward] |  |
Prepayments on flight equipment at beginning of period | $ 3,265,979 | $ 3,300,426
Prepayments made during the period | 1,162,884 | 837,776
Interest paid and capitalized during the period | 107,364 | 107,688
Prepayments and capitalized interest applied to the purchase of flight equipment | (1,605,924) | (979,911)
Prepayments on flight equipment at end of period | $ 2,930,303 | $ 3,265,979

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- Definition Deposits on Flight Equipment + References No definition available. + Details
Name: | aer_DepositsonFlightEquipmentRollForward
Namespace Prefix: | aer_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase in the carrying amount of advance payments for the acquisition of forward order aircraft for advance payments made during the period. + References No definition available. + Details
Name: | aer_PrepaymentsOnFlightEquipmentAdditionsAdvancePayments
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of increase in the carrying amount of advance payments for the acquisition of forward order aircraft for interest that is capitalized during the period. + References No definition available. + Details
Name: | aer_PrepaymentsOnFlightEquipmentAdditionsInterestCapitalized
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Amount of advance payments for the acquisition of forward order aircraft applied against the purchase of flight equipment during the period. Includes the related capitalized interest. + References No definition available. + Details
Name: | aer_PrepaymentsOnFlightEquipmentReductionsPurchaseOfFlightEquipment
Namespace Prefix: | aer_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Carrying amount, at the balance sheet date, of deposits made to the manufacturer for new flight equipment still under construction. May include capitalized interest. + References No definition available. + Details
Name: | us-gaap_DepositsOnFlightEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant