Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
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	$ 16,380	$ 17,186
Secured long-term debt	319,864	274,752
Less current portion	(102,093)	(97,273)
Total long-term debt	217,771	177,479
Secured Equipment Notes due in 2027 [Member]
Debt Instrument [Line Items]
Secured long-term debt	121,156	0
Secured Equipment Notes due in 2026 [Member]
Debt Instrument [Line Items]
Secured long-term debt	83,420	94,766
Secured Equipment Notes due in 2025 [Member]
Debt Instrument [Line Items]
Secured long-term debt	47,804	63,308
Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Secured long-term debt	24,121	34,432
Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Secured long-term debt	26,907	61,824
Secured Equipment Notes due in 2022 [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 76	$ 3,236

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