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Assets Held for Sale - Additional Information (Detail)
$ in Thousands
 3 Months Ended 12 Months Ended
Jan. 11, 2024
AirCraft
Jan. 01, 2024
USD ($)
Engine
Dec. 01, 2023
Engine
Dec. 31, 2023
USD ($)
AirCraft
Dec. 31, 2023
USD ($)
AirCraft
Dec. 31, 2023
USD ($)
AirCraft
Engine
Dec. 31, 2023
USD ($)
AirCraft
Airframes
Dec. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
AirCraft
Long Lived Assets Held For Sale [Line Items]                  
Asset impairment       $ 40,384       $ 3,719  
Assets held for sale       40,336 $ 40,336 $ 40,336 $ 40,336   $ 12,000
Number of surplus engines to be sold | Engine     12            
Number of engines held to sale | Engine           48      
Proceeds from sale of aircraft and engines       53,489          
Current Assets [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Assets held for sale       92,300 92,300 $ 92,300 92,300   57,700
Noncurrent Assets [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Assets held for sale       40,300 $ 40,300 $ 40,300 $ 40,300   $ 12,000
Subsequent Event [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Gross proceeds from sale of asset   $ 54,200              
Proceeds from sale of asset   $ 15,900              
Number of aircraft sold 4 12              
CRJ-900 Aircraft [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Asset impairment       45,500          
Impairment loss related to the held for sale aircraft       $ 40,400          
Number of aircraft held for sale | AirCraft         8       15
Number of aircrafts held for sale | AirCraft       15 15 15 15    
Gross proceeds from sale of asset       $ 12,000          
Assets held for sale       132,600 $ 132,600 $ 132,600 $ 132,600   $ 69,700
Assets sold held for sale       53,900          
Assets reclassified to held for sale       111,700          
Impairment gain due to fair value adjustments       5,100          
Number of aircraft sold | AirCraft         4        
Number of airframes without engines         11   11    
CRJ-900 Aircraft [Member] | Current Assets [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Assets held for sale       92,300 $ 92,300 92,300 $ 92,300   57,700
Assets sold held for sale       41,900          
Assets reclassified to held for sale       71,400          
Impairment gain due to fair value adjustments       5,100          
CRJ-900 Aircraft [Member] | Noncurrent Assets [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Assets held for sale       40,300 $ 40,300 $ 40,300 $ 40,300   $ 12,000
Assets sold held for sale       12,000          
Assets reclassified to held for sale       40,300          
CRJ-900 Aircraft [Member] | UST Loan [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Gross proceeds from sale of asset       12,000          
Proceeds from sale of asset       6,500          
Number of aircraft sold | AirCraft         4        
CF34-8C Aircraft [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Number of surplus engines to be sold | Engine           48      
American Airlines Inc. [Member] | CRJ-900 Aircraft [Member]                  
Long Lived Assets Held For Sale [Line Items]                  
Gross proceeds from sale of asset       41,500          
Proceeds from sale of asset       $ 5,700          
Number of aircraft sold | AirCraft         4