Long-Term Debt and Financing Arrangements - Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
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	$ 10,768	$ 6,137
Secured long-term debt	336,563	342,465
Less current portion	(98,350)	(101,741)
Total long-term debt	238,213	240,724
Secured Equipment Notes due in 2028 [Member]
Debt Instrument [Line Items]
Secured long-term debt	39,546	0
Secured Equipment Notes due in 2027 [Member]
Debt Instrument [Line Items]
Secured long-term debt	164,549	177,295
Secured Equipment Notes due in 2026 [Member]
Debt Instrument [Line Items]
Secured long-term debt	68,004	78,359
Secured Equipment Notes due in 2025 [Member]
Debt Instrument [Line Items]
Secured long-term debt	36,195	43,955
Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Secured long-term debt	13,740	20,751
Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 3,761	$ 15,968