Long-Term Debt and Financing Arrangements - Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Interim funding for equipment received and expected to be converted to an equipment note in a subsequent period; interest paid at a variable rate	$ 0	$ 3,265
Secured long-term debt	313,067	350,682
Less current portion	(103,192)	(105,108)
Total long-term debt	209,875	245,574
Secured Equipment Notes due in 2029 [Member]
Debt Instrument [Line Items]
Secured long-term debt	18,096	0
Secured Equipment Notes due in 2028 [Member]
Debt Instrument [Line Items]
Secured long-term debt	95,683	105,744
Secured Equipment Notes due in 2027 [Member]
Debt Instrument [Line Items]
Secured long-term debt	128,222	147,192
Secured Equipment Notes due in 2026 [Member]
Debt Instrument [Line Items]
Secured long-term debt	47,617	55,797
Secured Equipment Notes due in 2025 [Member]
Debt Instrument [Line Items]
Secured long-term debt	21,585	30,930
Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 1,864	$ 7,754