Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Jun. 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	$ 8,656	$ 8,902
Secured long-term debt	229,969	270,359
Less current portion	(86,868)	(93,562)
Total long-term debt	143,101	176,797
Secured Equipment Notes due in 2026 [Member]
Debt Instrument [Line Items]
Secured long-term debt	17,058	0
Secured Equipment Notes due in 2025 [Member]
Debt Instrument [Line Items]
Secured long-term debt	66,988	74,494
Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Secured long-term debt	42,804	49,920
Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Secured long-term debt	82,650	112,668
Secured Equipment Notes due in 2022 [Member]
Debt Instrument [Line Items]
Secured long-term debt	6,238	8,943
Secured Equipment Notes due in 2021 [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 5,575	$ 15,432

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