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Subsequent Events - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Jan. 02, 2020
Air-craft
Dec. 11, 2019
Engine
Nov. 26, 2019
Air-craft
Nov. 25, 2019
Air-craft
Aug. 28, 2019
Air-craft
Sep. 30, 2019
Air-craft
Subsequent Event [Line Items]            
Number of aircrafts operated           145
Number of leased aircraft           18
Number of additional aircraft permanently withdrawn due to company's failure to meet certain performance metrics         2  
American Airlines Inc. [Member] | Scenario Forecast [Member]            
Subsequent Event [Line Items]            
Number of deferred aircraft elected to remove 1          
E-175 Aircraft [Member]            
Subsequent Event [Line Items]            
Number of aircrafts operated           60
CRJ-700 Aircraft [Member]            
Subsequent Event [Line Items]            
Number of aircrafts operated           20
Subsequent Event [Member] | American Airlines Inc. [Member]            
Subsequent Event [Line Items]            
Number of additional aircraft permanently withdrawn due to company's failure to meet certain performance metrics       2    
Subsequent Event [Member] | E-175LL Aircraft [Member]            
Subsequent Event [Line Items]            
Number of additional aircrafts     20      
Number of years in operation     12 years      
Number of aircrafts operated     80      
Termination of aircraft operation, description     Commencing five (5) years after the actual in-service date, United has the right to remove the new E175LL aircraft from service by giving the Company 90 days or more notice, subject to certain conditions, including the payment of certain wind-down expenses plus, if removed prior to the ten (10) year anniversary of the in-service date, certain accelerated margin payments.      
Subsequent Event [Member] | E-175 Aircraft [Member]            
Subsequent Event [Line Items]            
Number of additional aircrafts     18      
Subsequent Event [Member] | E-175 Aircraft [Member] | United [Member]            
Subsequent Event [Line Items]            
Number of aircrafts operated     42      
Aircraft lease extension period     5 years      
Subsequent Event [Member] | CRJ-700 Aircraft [Member]            
Subsequent Event [Line Items]            
Number of leased aircraft     20      
Aircraft lease term     7 years      
Subsequent Event [Member] | CRJ-700 Aircraft [Member] | United [Member]            
Subsequent Event [Line Items]            
Aircraft lease term     7 years      
Right to purchase aircraft at fair market value     20      
Subsequent Event [Member] | CF34-8C5 Engine [Member]            
Subsequent Event [Line Items]            
Number of new spare engines to be acquired | Engine   20        
New spare engines delivery month and year description   The Company expects to take delivery of the engines between August 2020 and December 2021.