Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Share-based compensation (Restricted stock units and restricted stocks activity) (Details)

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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.