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Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Secured long-term debt | $ 315,460 | $ 330,784
Less current portion | (100,227) | (101,713)
Total long-term debt | 215,233 | 229,071
Secured Equipment Notes due in 2024 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 21,660 | 11,658
Secured Equipment Notes due in 2023 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 183,124 | 192,858
Secured Equipment Notes due in 2022 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 23,179 | 24,092
Secured Equipment Notes due in 2021 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 50,824 | 55,855
Secured Equipment Notes due in 2020 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | 27,598 | 32,904
Secured Equipment Notes due in 2019 [Member] |  |
Debt Instrument [Line Items] |  |
Secured long-term debt | $ 9,075 | $ 13,417

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