Subsequent Events - Additional Information (Detail) - USD ($) $ in Thousands			1 Months Ended
	Sep. 11, 2020	May 22, 2020	Oct. 31, 2020
Air Wisconsin [Member] | United Capacity Purchase Agreement [Member] | Maximum [Member]
Subsequent Event [Line Items]
Long term purchase agreement, extended term of contract			3 years
Air Wisconsin [Member] | United Capacity Purchase Agreement [Member] | Minimum [Member]
Subsequent Event [Line Items]
Long term purchase agreement, extended term of contract			2 years
Subsequent Event [Member]
Subsequent Event [Line Items]
Aggregate purchase price for aircraft acquired	$ 818	$ 3,000