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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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