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Organization and Operations - Additional Information (Detail)
 1 Months Ended 3 Months Ended
Jan. 02, 2020
Air-craft
Nov. 26, 2019
Air-craft
Nov. 25, 2019
Air-craft
Jan. 31, 2019
Air-craft
Jul. 31, 2019
Air-craft
Dec. 31, 2019
Daily_Departure
State
Air-craft
City
Employee
Apr. 02, 2019
Air-craft
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of states in which entity operates | State           41  
Number of aircrafts operated           145  
Number of cities in which entity operates | City           144  
Number of daily departures | Daily_Departure           742  
Number of employees | Employee           3,600  
Maximum number of aircraft to permanently withdraw in the event company fails to meet new/ revise performance metrics       6      
Number of aircraft converted to be utilized as operational spares             2
Number of aircraft permanently withdraw due to failure to meet new/revised performance metrics         2    
American capacity purchase agreement termination notice period           15 days  
Number of additional aircraft permanently withdrawn due to company's failure to meet certain performance metrics     2        
Maximum number of aircraft to withdraw in the event company fails to meet new/ revise performance metrics           14  
Notice period for termination of agreement           Our United Capacity Purchase Agreement permits United, subject to certain conditions, including the payment of certain costs tied to aircraft type, to terminate the agreement in its discretion, or remove aircraft from service, by giving us notice of 90 days or more.  
Number of leased aircraft           18  
United capacity purchase agreement termination notice period           30 days  
Subsequent Event [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of deferred aircraft elected to remove 1            
Number of aircraft removed due to failure to meet new/revised performance metrics 3            
Number of aircraft that would be withdrawn at any time due to failure to meet new/revised performance metrics 3            
Minimum [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Capacity purchase agreement, expiration year           2021  
Maximum [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Capacity purchase agreement, expiration year           2025  
CRJ-900 Aircraft [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of aircrafts operated           60  
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2021 [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of operated aircrafts expired or set to expire           32  
Lease expiration year           2021  
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2021 [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of operated aircrafts expired or set to expire           20  
Lease expiration year           2022  
CRJ-900 Aircraft [Member] | Aircraft Lease Expire In 2025 [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of operated aircrafts expired or set to expire           7  
Lease expiration year           2025  
CRJ-700 Aircraft [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of aircrafts operated           20  
Number of leased aircraft   20          
CRJ-700 Aircraft [Member] | United [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Aircraft lease term   7 years          
E-175 Aircraft [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of aircrafts operated   18       60  
Lease expiration year   2028          
E-175 Aircraft [Member] | Mesa [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of aircrafts operated           18  
E-175 Aircraft [Member] | United [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of aircrafts operated   42       42  
Aircraft lease extension period   5 years          
E-175 Aircraft [Member] | Minimum [Member] | United [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Lease expiration year   2024          
E-175 Aircraft [Member] | Maximum [Member] | United [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Lease expiration year   2028          
E175LL Aircraft [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Number of additional aircrafts   20          
Number of years in operation   12 years          
Termination of aircraft operation, description           Commencing five (5) years after the actual in-service date, United has the right to remove the E175LL aircraft from service by giving us notice of 90 days or more, 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.