Investments - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($) engine	Dec. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) aircraft.	Dec. 31, 2021 USD ($) equipment	Dec. 31, 2020 USD ($) engine	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($) aircraft.	Dec. 31, 2020 USD ($) equipment	Dec. 31, 2020 USD ($) noteReceivable
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%	50.00%	50.00%	50.00%
Equipment Held For Operating Lease
Schedule of Equity Method Investments [Line Items]
Net book value of equipment held for operating lease	$ 1,991,368	$ 1,991,368	$ 1,991,368	$ 1,991,368	$ 1,886,613	$ 1,886,613	$ 1,886,613	$ 1,886,613	$ 1,886,613
WMES
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%	50.00%	50.00%	50.00%
Number of engines in lease portfolio | engine	37
Number of aircraft in lease portfolio | aircraft.			5
Number of assets sold	2								1
Proceeds from sale of assets		$ 25,000				8,400
WMES | Other Revenue
Schedule of Equity Method Investments [Line Items]
Management fees earned		2,100				$ 1,600
WMES | Equipment Held For Operating Lease
Schedule of Equity Method Investments [Line Items]
Net book value of equipment held for operating lease	$ 292,500	$ 292,500	$ 292,500	$ 292,500
CASC Willis
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%	50.00%	50.00%	50.00%
Number of engines in lease portfolio | engine	4
Number of assets sold	0		0	0	0		0	0
CASC Willis | Equipment Held For Operating Lease
Schedule of Equity Method Investments [Line Items]
Net book value of equipment held for operating lease	$ 49,000	$ 49,000	$ 49,000	$ 49,000