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Assets Held for Sale - Additional Information (Detail) $ in Thousands |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Apr. 04, 2025 USD ($) Engine | Apr. 03, 2025 Engine | Dec. 31, 2024 USD ($) AirCraft | Dec. 31, 2024 USD ($) AirCraft Engines Airframes | Dec. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) Engines AirCraft Airframes | Sep. 30, 2023 USD ($) AirCraft | Sep. 30, 2022 USD ($)
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |
Asset impairment |  |  |  | $ 65,665 | $ 40,384 | $ 73,709 | $ 54,343 | $ 171,824
Impairment loss held for sale |  |  |  | 4,900 | $ 40,400 | 73,700 | 50,600 | $ 62,100
Aircraft held for sale current |  |  | $ 80,723 | $ 80,723 |  | 5,741 | 57,722 |
Aircraft held for sale |  |  |  |  |  | $ 86,605 | $ 12,000 |
Number of engines to be sold | Engines |  |  |  | 51 |  |  |  |
Number of airframes to be sold | Airframes |  |  |  | 28 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |
Number of engine sold | Engine | 13 |  |  |  |  |  |  |
Gross proceeds from sale of asset | $ 9,200 |  |  |  |  |  |  |
Number of engines to be sold | Engine |  | 23 |  |  |  |  |  |
CRJ-900 [Member] |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |
Number of aircraft held for sale | Airframes |  |  |  | 2 |  | 26 |  |
Aircraft held for sale current |  |  | $ 80,700 | $ 80,700 |  |  |  |
E-175 [Member] |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |
Number of aircraft held for sale | AirCraft |  |  |  |  |  |  | 18 |
E-175 [Member] | United Airlines, Inc. [Member] |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |
Number of aircraft held for sale | AirCraft |  |  | 10 | 18 |  |  |  |
Number of aircraft sold | AirCraft |  |  |  | 8 |  |  |  |
GE Model [Member] |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |
Number of aircraft held for sale | Engines |  |  |  | 4 |  | 55 |  |
CRJ-700 [Member] |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |
Number of aircraft held for sale | AirCraft |  |  |  | 2 |  | 2 |  |

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