XML 41 R34.htm IDEA: XBRL DOCUMENT v3.25.3
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