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Subsequent Events - Additional Information (Detail)
 3 Months Ended 12 Months Ended
Sep. 01, 2019
May 01, 2019
Apr. 01, 2019
Air-craft
Mar. 31, 2019
Air-craft
Jan. 29, 2019
Air-craft
Jan. 28, 2019
USD ($)
Engine
Dec. 31, 2018
Air-craft
Dec. 31, 2018
Engine
Subsequent Event [Line Items]                
Number of aircraft operated             145  
Term Sheet [Member] | American Airlines Inc. [Member] | Scenario, Forecast [Member]                
Subsequent Event [Line Items]                
Number of aircraft operated     62 64        
New and revised performance criteria, measured rolling period 45 days 60 days            
Term Loan [Member]                
Subsequent Event [Line Items]                
Number of engines acquired | Engine               6
Subsequent Event [Member] | Term Sheet [Member] | American Airlines Inc. [Member]                
Subsequent Event [Line Items]                
Number of additional aircraft for which withdraw notice is given due to failure to meet certain performance criteria         6      
Number of aircraft converted to be utilized as operational spares         2      
Number of aircraft related to additional monthly payments         2      
Additional monthly payments to be received, earliest month and year         2019-04      
Additional monthly payments to be received, latest month and year         2020-12      
Number of aircraft to permanently withdraw if operational performance metrics is not complied         1      
Maximum number of aircraft to withdraw in any calendar month if operational performance metrics is not complied         2      
Maximum number of aircraft to withdraw in total if operational performance metrics is not complied         6      
Subsequent Event [Member] | Term Loan [Member]                
Subsequent Event [Line Items]                
Debt instrument, face amount | $           $ 91,200,000    
Long term debt interest rate description           LIBOR plus 3.10%    
Term loan, term           5 years    
Number of aircraft engines securing obligations | Engine           27    
Number of new and used engines acquired securing obligations | Engine           6    
Subsequent Event [Member] | Term Loan [Member] | Spare Engine Facility [Member]                
Subsequent Event [Line Items]                
Long term debt interest rate description           LIBOR plus 7.25%    
Debt instrument, yield enhancement           1.50%    
Number of used engines securing obligations | Engine           21    
Subsequent Event [Member] | Term Loan [Member] | LIBOR [Member]                
Subsequent Event [Line Items]                
Long term debt basis spread on variable rate           3.10%    
Subsequent Event [Member] | Term Loan [Member] | LIBOR [Member] | Spare Engine Facility [Member]                
Subsequent Event [Line Items]                
Long term debt basis spread on variable rate           7.25%