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Investments - Additional Information (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) engine aircraft. | Jun. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net book value of equipment held for operating lease | $ 31,148 |  | $ 31,148 |  | $ 31,753
Equipment Held For Operating Lease |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net book value of equipment held for operating lease | $ 1,889,908 |  | $ 1,889,908 |  | $ 1,886,613
WMES |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest | 50.00% |  | 50.00% |  |
Number of engines in lease portfolio | engine |  |  | 36 |  |
Number of aircraft in lease portfolio | aircraft. |  |  | 5 |  |
WMES | Equipment Held For Operating Lease |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net book value of equipment held for operating lease | $ 280,600 |  | $ 280,600 |  |
CASC Willis |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership interest | 50.00% |  | 50.00% |  |
Number of engines in lease portfolio | engine |  |  | 4 |  |
CASC Willis | Equipment Held For Operating Lease |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Net book value of equipment held for operating lease | $ 49,400 |  | $ 49,400 |  |
Other Income | WMES | Asset Management |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other sales and revenues | $ 400 | $ 300 | $ 700 | $ 800 |

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