Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 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	$ 17,186	$ 8,902
Secured long-term debt	274,752	270,359
Less current portion	(97,273)	(93,562)
Total long-term debt	177,479	176,797
Secured Equipment Notes due in 2026 [Member]
Debt Instrument [Line Items]
Secured long-term debt	94,766
Secured Equipment Notes due in 2025 [Member]
Debt Instrument [Line Items]
Secured long-term debt	63,308	74,494
Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Secured long-term debt	34,432	49,920
Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Secured long-term debt	61,824	112,668
Secured Equipment Notes due in 2022 [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 3,236	8,943
Secured Equipment Notes due in 2021 [Member]
Debt Instrument [Line Items]
Secured long-term debt		$ 15,432

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