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Subsequent Events - Additional Information (Detail)
$ in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
May 19, 2020
Air-craft
May 11, 2020
USD ($)
Apr. 30, 2020
USD ($)
Air-craft
Block_Hour
Installment
Mar. 31, 2020
Air-craft
Apr. 30, 2020
USD ($)
Installment
Subsequent Event [Line Items]          
Number of aircrafts operated | Air-craft       145  
CRJ-900 Aircraft [Member]          
Subsequent Event [Line Items]          
Number of aircrafts operated | Air-craft       59  
Scenario Forecast [Member] | Code Share and Revenue Sharing Agreement [Member] | American Airlines Inc. [Member]          
Subsequent Event [Line Items]          
Number of aircraft elected to withdrawn | Air-craft 2        
Subsequent Event [Member]          
Subsequent Event [Line Items]          
CARES act grant amount | $     $ 92.5    
CARES act, grants received under first installment | $     30.8    
CARES act, remaining grants yet to receive | $     $ 61.6   $ 61.6
Number of installments to receive remaining grants | Installment     4   4
CARES act, expected deferred payments pertaining to social security taxes. | $   $ 7.0      
Percentage of payment deferred pertaining to current fiscal year   50.00%      
Due date of initial deferred payment expected   Dec. 31, 2021      
Percentage of payment deferred pertaining to next fiscal year   50.00%      
Due date of second deferred payment expected   Dec. 31, 2022      
Number of block hours | Block_Hour     10,297    
Percentage of reduction in block hours         72.40%
Subsequent Event [Member] | Code Share and Revenue Sharing Agreement [Member] | American Airlines Inc. [Member]          
Subsequent Event [Line Items]          
Number of aircraft permanently withdraw | Air-craft     3    
Description of aircraft withdrawal     In April 2020, the Company received a withdrawal notice from American seeking to permanently withdraw three aircraft from the Code Share and Revenue Sharing Agreement. Two of the aircraft will be withdrawn effective May 19, 2020 and the third aircraft will be withdrawn effective June 1, 2020.    
Subsequent Event [Member] | Code Share and Revenue Sharing Agreement [Member] | American Airlines Inc. [Member] | CRJ-900 Aircraft [Member]          
Subsequent Event [Line Items]          
Number of aircrafts operated | Air-craft     56    
Subsequent Event [Member] | Aircraft Lender [Member]          
Subsequent Event [Line Items]          
Deferred of principal debt payments | $   $ 28.0      
Deferred of principal debt payments start date   Mar. 19, 2020      
Deferred of principal debt payments end date   Sep. 30, 2020