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Summary of Significant Accounting Policies - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) AirCraft | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Deferred revenue | $ 1,400,000 |  | $ 3,300,000 |  |
Lease revenue | $ 0 | $ 24,900,000 | $ 5,900,000 | $ 88,100,000 |
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenue From Contract With Customer Excluding Assessed Tax | Revenue From Contract With Customer Excluding Assessed Tax | Revenue From Contract With Customer Excluding Assessed Tax | Revenue From Contract With Customer Excluding Assessed Tax |
Number of air craft leased from third parties | AirCraft |  |  | 0 |  |
Current and non-current deferred credit contract liability balances | $ 0 |  | $ 0 |  | $ 3,100,000
Recognized deferred credits within contract revenue | 0 | $ 300,000 | 3,200,000 | $ 800,000 |
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense | 0 | 800,000 | 200,000 | 2,400,000 |
Deferred heavy maintenance balance, net of accumulated amortization | 0 |  | 0 |  | $ 5,400,000
Engine overhaul expense | 5,900,000 | 4,900,000 | 20,600,000 | 17,300,000 |
Engine overhaul pass-through expense | 5,900,000 | 5,400,000 | 20,500,000 | 17,800,000 |
Insurance claim reimbursement net of engine overhaul expense |  | 500,000 |  | 500,000 |
Airframe check expense | 6,900,000 | 8,200,000 | 19,600,000 | 16,500,000 |
Airframe check pass-through expense | $ 6,300,000 | $ 7,200,000 | $ 16,300,000 | $ 12,500,000 |
E-175 Aircraft [Member] |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |
Number of aircraft sold | AirCraft |  |  | 18 |  |

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