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Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
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 | $ 10,440 | $ 8,902
Secured long-term debt | 258,250 | 270,359
Less current portion | (92,598) | (93,562)
Total long-term debt | 165,652 | 176,797
Secured Equipment Notes due in 2026 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 67,656 | 0
Secured Equipment Notes due in 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 63,211 | 74,494
Secured Equipment Notes due in 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 37,730 | 49,920
Secured Equipment Notes due in 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 72,275 | 112,668
Secured Equipment Notes due in 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 4,679 | 8,943
Secured Equipment Notes due in 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | $ 2,259 | $ 15,432

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