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v3.22.2.2

Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Interim funding for equipment received and expected to be converted to an equipment note in subsequent year; interest paid at a variable rate | $ 16,380 | $ 17,186
Secured long-term debt | 319,864 | 274,752
Less current portion | (102,093) | (97,273)
Total long-term debt | 217,771 | 177,479
Secured Equipment Notes due in 2027 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 121,156 | 0
Secured Equipment Notes due in 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 83,420 | 94,766
Secured Equipment Notes due in 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 47,804 | 63,308
Secured Equipment Notes due in 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 24,121 | 34,432
Secured Equipment Notes due in 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 26,907 | 61,824
Secured Equipment Notes due in 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | $ 76 | $ 3,236

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