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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 11, 2024
AirCraft
Jan. 01, 2024
Engine
Dec. 31, 2023
USD ($)
AirCraft
Dec. 31, 2022
USD ($)
Sep. 30, 2022
AirCraft
Sep. 30, 2023
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Deferred revenue     $ 3.0      
Lease revenue     $ 34.9 $ 41.1    
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    
Number of air craft leased from third parties | AirCraft     18      
Current and non-current deferred credit contract liability balances     $ 4.9     $ 5.1
Recognized deferred credits within contract revenue     1.0 $ 0.2    
Amortization of heavy maintenance and major overhaul costs charged to depreciation and amortization expense     0.8 0.8    
Deferred heavy maintenance balance, net of accumulated amortization     7.2     $ 8.0
Engine overhaul expense     5.8 8.7    
Engine overhaul pass-through expense     5.7 8.7    
Airframe check expense     6.4 5.1    
Airframe check pass-through expense     $ 3.8 $ 4.4    
CRJ 700 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of aircraft to be leased | AirCraft     20   20  
Operating lease, term of contract     9 years      
CRJ 700 [Member] | GoJet Agreements [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of aircraft classified as assets held for sale | AirCraft         18  
Number of aircraft sold | AirCraft     18      
Subsequent Event [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Number of aircraft sold 4 12