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Investments - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) equipment engine aircraft.	Sep. 30, 2020 USD ($) equipment noteReceivable	Dec. 31, 2020 USD ($)
Equipment Held For Operating Lease
Schedule of Equity Method Investments [Line Items]
Net book value of equipment held for operating lease	$ 1,971,252		$ 1,971,252		$ 1,886,613
WMES
Schedule of Equity Method Investments [Line Items]
Ownership interest	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 | Aircraft
Schedule of Equity Method Investments [Line Items]
Net book value of equipment held for operating lease	$ 297,300		$ 297,300
CASC Willis
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%		50.00%
Number of engines in lease portfolio | engine			4
Number of assets sold | equipment			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	$ 48,900		$ 48,900
Other Income | WMES | Asset Management
Schedule of Equity Method Investments [Line Items]
Other sales and revenues	$ 900	$ 400	$ 1,600	$ 1,200

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