Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Interim funding for equipment received and expected to be converted to an equipment note in a subsequent year; interest paid at a variable rate	$ 11,547	$ 17,186
Secured long-term debt	286,832	274,752
Less current portion	(98,774)	(97,273)
Total long-term debt	188,058	177,479
Secured Equipment Notes due in 2027 [Member]
Debt Instrument [Line Items]
Secured long-term debt	69,157	0
Secured Equipment Notes due in 2026 [Member]
Debt Instrument [Line Items]
Secured long-term debt	88,763	94,766
Secured Equipment Notes due in 2025 [Member]
Debt Instrument [Line Items]
Secured long-term debt	51,780	63,308
Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Secured long-term debt	27,561	34,432
Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Secured long-term debt	37,757	61,824
Secured Equipment Notes due in 2022 [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 267	$ 3,236

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