Liquidity - Additional Information (Detail) $ in Thousands		1 Months Ended
	Apr. 13, 2020 USD ($)	Sep. 30, 2020 BlockHours	Aug. 31, 2020 BlockHours	Jul. 31, 2020 BlockHours	Jun. 30, 2020 BlockHours	Sep. 30, 2019 BlockHours	Aug. 31, 2019 BlockHours	Jul. 31, 2019 BlockHours	Oct. 01, 2020 Employees	Apr. 20, 2020 USD ($)	Mar. 31, 2020 USD ($)
Liquidity Uncertainty And Going Concern [Line Items]
Interest payments deferred											$ 5,000
COVID-19 [Member]
Liquidity Uncertainty And Going Concern [Line Items]
Number of block hours operated | BlockHours						13,336	14,041	14,043
Subsequent Event [Member] | COVID-19 [Member]
Liquidity Uncertainty And Going Concern [Line Items]
Number of block hours operated | BlockHours		5,205	4,076	2,206	1,759
Percentage increase decrease in the block hours operated					88.00%
Subsequent Event [Member] | COVID-19 Pandemic And Pursuant To Workers Adjustment And Retraining Notification Act [Member] | Air Wisconsin [Member]
Liquidity Uncertainty And Going Concern [Line Items]
Number of employees estimated to be furloughed | Employees									871
Number of employees actually furloughed | Employees									305
Small Business Administration Payroll Protection Program [Member] | Subsequent Event [Member] | Air Wisconsin [Member]
Liquidity Uncertainty And Going Concern [Line Items]
Term Loan Maturity	2 years
Interest rate	1.00%
Aggregate loan amount received	$ 10,000
Percentage of the forgiven loan amount that may be used for non payroll costs	40.00%
Treasury Department Payroll Support Program [Member] | Subsequent Event [Member]
Liquidity Uncertainty And Going Concern [Line Items]
Payroll Support Agreement Awardable Amount										$ 42,200