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Long-Term Debt and Financing Arrangements - Schedule of Outstanding Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Interim funding for equipment received and expected to be converted to an equipment note in a subsequent period; interest paid at a variable rate $ 49,751 $ 0
Secured long-term debt 254,999 264,362
Less current portion (94,520) (100,001)
Total long-term debt 160,479 164,361
Secured Equipment Note Maturing in 2030 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 17,737 0
Secured Equipment Notes Maturing in 2029 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt [1] 16,366 21,400
Secured Equipment Notes Maturing in 2028 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 69,229 85,050
Secured Equipment Notes Maturing in 2027 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 78,309 108,411
Secured Equipment Notes Maturing in 2026 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 21,042 36,942
Secured Equipment Notes Maturing in 2025 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt $ 2,565 $ 12,559
[1]

(1) Includes an immaterial amount of notes held at EASO with interest rates up to 13.95%.