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Balance Sheet Information - Summary of Certain Significant Amounts Included in Condensed Consolidated Balance Sheet (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Expendable parts and supplies, net: |  |
Expendable parts and supplies | $ 24,004 | $ 39,404
Less: expendable parts warranty | (4,145) | (5,574)
Less: obsolescence | (3,230) | (4,658)
Expendable parts and supplies, net | 16,629 | 29,172
Property and equipment, net: |  |
Property and equipment-gross | 59,884 | 329,619
Less: accumulated depreciation | (28,385) | (126,052)
Property and equipment-net | 31,499 | 203,567
Property and equipment, net | 31,499 | 203,567
Other assets: |  |
Investments in equity securities | 300 | 300
Contract asset | 3,942 | 5,400
Other | 860 | 1,129
Other assets | 5,102 | 6,829
Other accrued expenses: |  |
Accrued property taxes | 2,815 | 4,722
Accrued interest | 981 | 3,207
Accrued vacation | 6,123 | 7,308
Accrued lodging | 3,287 | 3,847
Accrued simulator costs | 659 | 543
Accrued maintenance | 1,830 | 1,911
Accrued employee benefits | 1,132 | 1,528
Accrued fleet operating expense | 598 | 3,118
Customer deposits | 224 | 962
Other | 9,041 | 8,298
Other accrued expenses | 26,690 | 35,444
Other noncurrent liabilities: |  |
Warrant liabilities | 100 | 25,225
Long-term employee benefits | 1,759 | 537
Other |  | 913
Other noncurrent liabilities | 1,859 | 26,675
Aircraft and Other Flight Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | 50,355 | 319,831
Other Machinery and Equipment [Member] |  |
Property and equipment, net: |  |
Property and equipment-gross | $ 9,529 | $ 9,788

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