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Debt Obligations - Narrative (Details) $ in Millions | 1 Months Ended |  |
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May 31, 2021 | Jun. 30, 2021 airframe | May 31, 2021 | May 31, 2021 airframe | May 31, 2021 USD ($) | May 31, 2021 debtSeries | May 31, 2021 engine
Long Term Debt |  |  |  |  |  |  |
Number of debt series issued | debtSeries |  |  |  |  |  | 3 |
Number of assets used to secure debt | engine |  |  |  |  |  |  | 2
WEST VI |  |  |  |  |  |  |
Long Term Debt |  |  |  |  |  |  |
Number of assets used to secure debt |  |  |  | 1 |  |  | 29
WEST VI Notes | WEST VI |  |  |  |  |  |  |
Long Term Debt |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 336.7 |  |
WEST VI Series A Notes |  |  |  |  |  |  |
Long Term Debt |  |  |  |  |  |  |
Fixed rate (as a percent) |  | 3.10% | 3.104% |  |  |  |
Debt instrument, term | 8 years |  |  |  |  |  |
Notes issue price, percentage of par | 99.99481% |  |  |  |  |  |
Number of assets used to secure debt | airframe |  | 1 |  |  |  |  |
WEST VI Series A Notes | WEST VI |  |  |  |  |  |  |
Long Term Debt |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | 278.6 |  |
WEST VI Series B Notes |  |  |  |  |  |  |
Long Term Debt |  |  |  |  |  |  |
Fixed rate (as a percent) |  | 5.44% | 5.438% |  |  |  |
Debt instrument, term | 8 years |  |  |  |  |  |
Notes issue price, percentage of par | 99.99996% |  |  |  |  |  |
Number of assets used to secure debt | airframe |  | 1 |  |  |  |  |
WEST VI Series B Notes | WEST VI |  |  |  |  |  |  |
Long Term Debt |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | 38.7 |  |
WEST VI Series C Notes |  |  |  |  |  |  |
Long Term Debt |  |  |  |  |  |  |
Fixed rate (as a percent) |  | 7.39% | 7.385% |  |  |  |
Debt instrument, term | 8 years |  |  |  |  |  |
Notes issue price, percentage of par | 99.99869% |  |  |  |  |  |
Number of assets used to secure debt | airframe |  | 1 |  |  |  |  |
WEST VI Series C Notes | WEST VI |  |  |  |  |  |  |
Long Term Debt |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 19.4 |  |

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