Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Interim funding for a deposit on equipment to be received in late 2020; interest paid monthly at a variable rate	$ 3,820
Total debt	258,805	$ 281,625
Less current portion	(90,948)	(94,691)
Total long-term debt	167,857	186,934
Secured Equipment Notes due in 2025 [Member]
Debt Instrument [Line Items]
Secured long-term debt	21,840
Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Secured long-term debt	56,734	62,690
Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Secured long-term debt	133,499	153,350
Secured Equipment Notes due in 2022 [Member]
Debt Instrument [Line Items]
Secured long-term debt	12,201	16,892
Secured Equipment Notes due in 2021 [Member]
Debt Instrument [Line Items]
Secured long-term debt	25,034	35,076
Secured Equipment Notes due in 2020 [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 5,677	$ 13,617

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