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Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
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 | $ 8,902 |
Secured long-term debt | 270,359 | $ 281,625
Less current portion | (93,562) | (94,691)
Total long-term debt | 176,797 | 186,934
Secured Equipment Notes due in 2025 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 74,494 |
Secured Equipment Notes due in 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 49,920 | 62,690
Secured Equipment Notes due in 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 112,668 | 153,350
Secured Equipment Notes due in 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 8,943 | 16,892
Secured Equipment Notes due in 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | $ 15,432 | 35,076
Secured Equipment Notes due in 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt |  | $ 13,617

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