Concentration of Risk - Rental Revenue and Percentage of Rental Flight Equipment Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Concentration Risk [Line Items]
Amount of Rental Revenue	$ 2,003,337	$ 1,946,620	$ 1,916,869
Sales | Geographic Region
Concentration Risk [Line Items]
Amount of Rental Revenue	$ 2,003,337	$ 1,946,620	$ 1,916,869
% of Total	100.00%	100.00%	100.00%
Sales | Geographic Region | Europe
Concentration Risk [Line Items]
Amount of Rental Revenue	$ 564,479	$ 525,543	$ 531,778
% of Total	28.20%	27.00%	27.70%
Sales | Geographic Region | Asia (excluding China)
Concentration Risk [Line Items]
Amount of Rental Revenue	$ 558,020	$ 573,722	$ 484,017
% of Total	27.90%	29.50%	25.30%
Sales | Geographic Region | China
Concentration Risk [Line Items]
Amount of Rental Revenue	$ 352,375	$ 341,121	$ 357,278
% of Total	17.60%	17.50%	18.60%
Sales | Geographic Region | The Middle East and Africa
Concentration Risk [Line Items]
Amount of Rental Revenue	$ 210,977	$ 220,017	$ 226,932
% of Total	10.50%	11.30%	11.80%
Sales | Geographic Region | U.S. and Canada
Concentration Risk [Line Items]
Amount of Rental Revenue	$ 130,717	$ 106,694	$ 98,627
% of Total	6.50%	5.50%	5.10%
Sales | Geographic Region | Central America, South America and Mexico
Concentration Risk [Line Items]
Amount of Rental Revenue	$ 104,315	$ 88,113	$ 124,850
% of Total	5.20%	4.50%	6.60%
Sales | Geographic Region | Pacific, Australia, and New Zealand
Concentration Risk [Line Items]
Amount of Rental Revenue	$ 82,454	$ 91,410	$ 93,387
% of Total	4.10%	4.70%	4.90%