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Investments - Additional Information (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) engine aircraft.	Jun. 30, 2018 USD ($) engine aircraft.	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Net book value of equipment held for operating lease	$ 1,603,179		$ 1,603,179		$ 1,673,135
Investment in joint ventures at beginning of the period			47,941
Earnings from joint ventures			2,622
Investment			(5,013)	$ 0
Distributions			(3,300)	0
Foreign currency translation adjustment			(34)
Investment in joint ventures at end of the period	52,242		52,242
Management fees included in other revenue	$ 4,591	$ 1,871	$ 7,569	$ 3,752
WMES
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%		50.00%
Number of engines in lease portfolio | engine			33
Number of aircraft in lease portfolio | aircraft.			6
Net book value of equipment held for operating lease	$ 309,000		$ 309,000
Investment in joint ventures at beginning of the period			34,183
Earnings from joint ventures			2,565
Investment			(5,013)
Distributions			(3,300)
Foreign currency translation adjustment			0
Investment in joint ventures at end of the period	38,461		$ 38,461
Number of aircrafts sold | aircraft.			5	1
Number of engines sold | engine				1
Proceeds from sale of engines			$ 75,500	$ 21,400
WMES | Asset Management
Schedule of Equity Method Investments [Line Items]
Management fees included in other revenue	$ 600	$ 500	$ 1,100	$ 1,200
CASC Willis
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%		50.00%
Number of engines in lease portfolio | engine			4
Net book value of equipment held for operating lease	$ 51,900		$ 51,900
Investment in joint ventures at beginning of the period			13,758
Earnings from joint ventures			57
Investment			0
Distributions			0
Foreign currency translation adjustment			(34)
Investment in joint ventures at end of the period	$ 13,781		$ 13,781

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