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Long-Term Debt and Financing Arrangements - Schedule of Outstanding Debt (Detail) - USD ($)
$ in Thousands
Jun. 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 $ 857 $ 0
Secured long-term debt 231,920 264,362
Less current portion (97,641) (100,001)
Total long-term debt 134,279 164,361
Secured Equipment Note Maturing in 2030 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 17,710 0
Secured Equipment Notes Maturing in 2029 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt [1] 18,549 21,400
Secured Equipment Notes Maturing in 2028 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 74,581 85,050
Secured Equipment Notes Maturing in 2027 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 88,315 108,411
Secured Equipment Notes Maturing in 2026 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 26,337 36,942
Secured Equipment Notes Maturing in 2025 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt $ 5,571 $ 12,559
[1]

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