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Share-based compensation (Restricted stock units and restricted stocks activity) (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Weighted average grant date fair value ($) |  |  |  |
Share based compensation expense |  | $ 107,719,000 | $ 102,843,000 | $ 100,162,000
Time Based Restricted Stock Units And Restricted Stock |  |  |  |
Number |  |  |  |
Number at beginning of period (in shares) |  | 3,579,834 |  |
Granted (in shares) | [1] | 740,690 |  |
Vested (in shares) | [2] | (859,033) |  |
Cancelled (in shares) |  | (85,404) |  |
Number at end of period (in shares) |  | 3,376,087 | 3,579,834 |
Weighted average grant date fair value ($) |  |  |  |
Number at beginning of period (in USD per share) |  | $ 42.78 |  |
Granted (in USD per share) | [1] | 50.68 |  |
Vested (in USD per share) | [2] | 33.59 |  |
Cancelled (in USD per share) |  | 44.08 |  |
Number at end of period (in USD per share) |  | $ 46.85 | $ 42.78 |
Peformance Based Restricted Stock Units And Restricted Stock [Member] |  |  |  |
Number |  |  |  |
Number at beginning of period (in shares) |  | 5,512,342 |  |
Granted (in shares) | [1] | 1,079,416 |  |
Vested (in shares) | [2] | (440,064) |  |
Cancelled (in shares) |  | (29,445) |  |
Number at end of period (in shares) |  | 6,122,249 | 5,512,342 |
Weighted average grant date fair value ($) |  |  |  |
Number at beginning of period (in USD per share) |  | $ 46.19 |  |
Granted (in USD per share) | [1] | 51.49 |  |
Vested (in USD per share) | [2] | 46.59 |  |
Cancelled (in USD per share) |  | 42.10 |  |
Number at end of period (in USD per share) |  | $ 47.12 | $ 46.19 |
Restricted Stock [Member] | NV Equity Plan |  |  |  |
Number |  |  |  |
Granted (in shares) | [1] | 451,070 |  |
Weighted average grant date fair value ($) |  |  |  |
Restricted stocks issued (in shares) |  | 279,697 |  |
Restricted stocks issued net of withholding for taxes (in shares) |  | 171,373 |  |
Share based compensation expense |  | $ 3,400,000.0 |  |
Restricted Stock [Member] | NV Equity Plan | Revenue Commissioners, Ireland [Member] |  |  |  |
Weighted average grant date fair value ($) |  |  |  |
Restricted stocks issued net of withholding for taxes treated as granted (in shares) |  | 64,771 |  |
Restricted Stock Units [Member] | NV Equity Plan |  |  |  |
Number |  |  |  |
Vested (in shares) |  | (296,201) |  |
Weighted average grant date fair value ($) |  |  |  |
Ordinary shares issued to the holders of these restricted stock units with the remainder being withheld and applied to pay the taxes involved (in shares) |  | 187,096 |  |
Lapsed Restrictions On Restricted Stock [Member] | NV Equity Plan |  |  |  |
Weighted average grant date fair value ($) |  |  |  |
Restricted stocks issued net of withholding for taxes (in shares) |  | 655,207 |  |
Restricted stock issued (in shares) |  | 938,125 |  |
Lapsed Restrictions On Restricted Stock [Member] | NV Equity Plan | Revenue Commissioners, Ireland [Member] |  |  |  |
Weighted average grant date fair value ($) |  |  |  |
Restricted stocks issued net of withholding for taxes treated as granted (in shares) |  | 64,771 |  |
[1] | Includes 451,070 shares of restricted stock granted under the AerCap Holdings N.V. Equity Plans, of which 279,697 shares of restricted stock were issued with the remaining 171,373 shares being withheld and applied to pay the taxes involved. As part of the 171,373 shares withheld to pay for taxes, 64,771 shares were treated as granted and subsequently vested on the grant date under specific Irish tax legislation. As a result, we recognized an expense of $3.4 million on the grant dates associated with these shares.
[2] | 296,201 restricted stock units, which were previously granted under the AerCap Holdings N.V. Equity Plans, vested. In connection with the vesting of the restricted stock units, the Company issued, in full satisfaction of its obligations, 187,096 ordinary shares to the holders of these restricted stock units, with the remainder being withheld and applied to pay the taxes in respect of those awards. Restrictions on 938,125 shares of restricted stock (655,207 shares of restricted stock net of withholding for taxes) lapsed during the period. In addition, 64,771 shares were treated as granted and subsequently vested on the grant dates as described in (a) above.

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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cancelled in Period + References No definition available. + Details
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- Definition Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Cancelled in Period, Weighted Average Grant Date Fair Value + References No definition available. + Details
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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of restricted shares issued as compensation, net of shares for the payment of withholding taxes. This element is to be used only if shares are used in lieu of cash to satisfy all or a portion of withholding taxes. + References No definition available. + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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