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Investments - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) engine aircraft.	Mar. 31, 2018 USD ($) aircraft.	Dec. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Net book value of equipment held for operating lease	$ 1,605,120		$ 1,673,135
Investment in joint ventures at beginning of the period	47,941
Earnings from joint ventures	946
Investment	(5,013)	$ 0
Foreign currency translation adjustment	353
Investment in joint ventures at end of the period	54,253
Management fees included in other revenue	$ 2,978	$ 1,882
WMES
Schedule of Equity Method Investments [Line Items]
Ownership interest	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	$ 318,400
Investment in joint ventures at beginning of the period	34,183
Earnings from joint ventures	747
Investment	(5,013)
Foreign currency translation adjustment	0
Investment in joint ventures at end of the period	$ 39,943
Number of aircrafts sold | aircraft.	5	1
Number of engines sold | aircraft.		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	$ 700
CASC Willis
Schedule of Equity Method Investments [Line Items]
Ownership interest	50.00%
Number of engines in lease portfolio | engine	4
Net book value of equipment held for operating lease	$ 52,700
Investment in joint ventures at beginning of the period	13,758
Earnings from joint ventures	199
Investment	0
Foreign currency translation adjustment	353
Investment in joint ventures at end of the period	$ 14,310

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