Debt - Additional information (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Dec. 31, 2018	Jul. 31, 2003
Extinguishment of Debt [Line Items]
Operating lease right-of-use asset	$ 7,159	$ 10,270
Hangar
Extinguishment of Debt [Line Items]
Operating lease right-of-use asset	$ 2,142	$ 2,315
City of Milwaukee, Wisconsin variable rate Industrial Development Bonds
Extinguishment of Debt [Line Items]
Aggregate principal amount				$ 4,275
Aircraft Notes
Extinguishment of Debt [Line Items]
Aggregate principal amount			$ 70,000