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Fair Value Measurements - Additional Information (Details) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 USD ($) equipment engine | Jun. 30, 2020 USD ($) engine | Jun. 30, 2021 USD ($) equipment | Jun. 30, 2021 USD ($) equipment engine | Jun. 30, 2021 USD ($) airframe equipment | Jun. 30, 2020 USD ($) engine | Dec. 31, 2020 USD ($)
Derivative [Line Items] |  |  |  |  |  |  |
Fair value of notes receivable | $ 198,000,000.0 |  | $ 198,000,000.0 | $ 198,000,000.0 | $ 198,000,000.0 |  | $ 159,200,000
Fair value of notes payable | 1,926,800,000 |  | 1,926,800,000 | $ 1,926,800,000 | $ 1,926,800,000 |  | 1,691,000,000.0
Interest expense | 16,987,000 | $ 16,089,000 | 32,006,000 |  |  | $ 31,785,000 |
Asset write-down | $ 2,200,000 | $ 7,000,000.0 | 4,100,000 |  |  | $ 9,100,000 |
Number of assets impaired | 4 |  |  | 4 | 1 |  |
Remaining book value | $ 40,700,000 |  | $ 40,700,000 | $ 40,700,000 | $ 40,700,000 |  |
Number of assets previously impaired | equipment | 23 |  | 23 | 23 | 23 |  |
Assets to be Sold or Parted Out |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of assets impaired | engine |  | 3 |  |  |  | 5 |
Impaired Assets |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Number of assets impaired | engine |  | 2 |  |  |  | 2 |
Interest rate contract |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |
Net fair value of swap asset (liability) | $ 1,800,000 |  | $ 1,800,000 | $ 1,800,000 | $ 1,800,000 |  | $ (4,000,000.0)
Fair value of interest rate swap, asset | 3,900,000 |  | 3,900,000 | 3,900,000 | 3,900,000 |  |
Fair value of interest rate swap, liability | 2,100,000 |  | 2,100,000 | $ 2,100,000 | $ 2,100,000 |  |
Interest expense | $ 500,000 | $ 600,000 | $ 1,400,000 |  |  | $ 600,000 |

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