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Concentration of risk (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
aircraft
customer
Dec. 31, 2014
USD ($)
customer
Dec. 31, 2013
USD ($)
Concentration of risk      
Minimum percentage of aircraft operated internationally based on net book value 95.00%    
Number of aircraft sold or agreed to be sold | aircraft 19    
Net book value $ 10,813,475 $ 8,953,804  
Amount of rental revenue $ 1,174,544 $ 991,241 $ 836,516
Geographic Region | China      
Concentration of risk      
Number of customers | customer 12 11  
Percent of Total 13.40% 13.80%  
Net book value of aircraft portfolio | Geographic Region      
Concentration of risk      
Net book value $ 10,813,475 $ 8,953,804  
Percent of Total 100.00% 100.00%  
Net book value of aircraft portfolio | Geographic Region | Europe      
Concentration of risk      
Net book value $ 3,238,323 $ 2,953,232  
Percent of Total 30.00% 33.00%  
Net book value of aircraft portfolio | Geographic Region | China      
Concentration of risk      
Net book value $ 2,444,370 $ 2,348,784  
Percent of Total 22.60% 26.20%  
Net book value of aircraft portfolio | Geographic Region | Asia (excluding China)      
Concentration of risk      
Net book value $ 2,313,477 $ 1,489,739  
Percent of Total 21.40% 16.70%  
Net book value of aircraft portfolio | Geographic Region | Central America, South America And Mexico      
Concentration of risk      
Net book value $ 923,352 $ 778,991  
Percent of Total 8.50% 8.70%  
Net book value of aircraft portfolio | Geographic Region | The Middle East And Africa      
Concentration of risk      
Net book value $ 1,023,715 $ 498,896  
Percent of Total 9.50% 5.60%  
Net book value of aircraft portfolio | Geographic Region | U.S. and Canada      
Concentration of risk      
Net book value $ 446,839 $ 412,532  
Percent of Total 4.10% 4.60%  
Net book value of aircraft portfolio | Geographic Region | Pacific, Australia, New Zealand      
Concentration of risk      
Net book value $ 423,399 $ 471,630  
Percent of Total 3.90% 5.20%  
Number of customers | Geographic Region      
Concentration of risk      
Number of customers | customer 90 80  
Percent of Total 100.00% 100.00%  
Number of customers | Geographic Region | Europe      
Concentration of risk      
Number of customers | customer 27 24  
Percent of Total 30.00% 30.00%  
Number of customers | Geographic Region | Asia (excluding China)      
Concentration of risk      
Number of customers | customer 19 18  
Percent of Total 21.10% 22.50%  
Number of customers | Geographic Region | Central America, South America And Mexico      
Concentration of risk      
Number of customers | customer 11 10  
Percent of Total 12.20% 12.50%  
Number of customers | Geographic Region | The Middle East And Africa      
Concentration of risk      
Number of customers | customer 8 7  
Percent of Total 8.90% 8.80%  
Number of customers | Geographic Region | U.S. and Canada      
Concentration of risk      
Number of customers | customer 11 8  
Percent of Total 12.20% 10.00%  
Number of customers | Geographic Region | Pacific, Australia, New Zealand      
Concentration of risk      
Number of customers | customer 2 2  
Percent of Total 2.20% 2.40%  
Flight equipment revenue | Asia (excluding China)      
Concentration of risk      
Amount of rental revenue $ 223,284    
Percent of Total 19.00%   169700.00%
Flight equipment revenue | Geographic Region      
Concentration of risk      
Amount of rental revenue $ 1,174,544    
Percent of Total 100.00%   836516.00%
Flight equipment revenue | Geographic Region | Europe      
Concentration of risk      
Amount of rental revenue $ 380,295    
Percent of Total 32.40%   300761.00%
Flight equipment revenue | Geographic Region | China      
Concentration of risk      
Amount of rental revenue $ 265,450    
Percent of Total 22.60%   129772.00%
Flight equipment revenue | Geographic Region | Central America, South America And Mexico      
Concentration of risk      
Amount of rental revenue $ 114,672    
Percent of Total 9.80%   107857.00%
Flight equipment revenue | Geographic Region | The Middle East And Africa      
Concentration of risk      
Amount of rental revenue $ 90,416    
Percent of Total 7.70%   55624.00%
Flight equipment revenue | Geographic Region | U.S. and Canada      
Concentration of risk      
Amount of rental revenue $ 54,294    
Percent of Total 4.60%   57366.00%
Flight equipment revenue | Geographic Region | Pacific, Australia, New Zealand      
Concentration of risk      
Amount of rental revenue $ 46,133    
Percent of Total 3.90%   15436.00%