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Schedule of Outstanding Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 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 $ 6,137 $ 17,186
Secured long-term debt 342,465 274,752
Less current portion (101,741) (97,273)
Total long-term debt 240,724 177,479
Secured Equipment Notes due in 2027 [member]    
Debt Instrument [Line Items]    
Secured long-term debt 177,295 0
Secured Equipment Notes due in 2026 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 78,359 94,766
Secured Equipment Notes due in 2025 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 43,955 63,308
Secured Equipment Notes due in 2024 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 20,751 34,432
Secured Equipment Notes due in 2023 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 15,968 61,824
Secured Equipment Notes due in 2022 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt $ 0 $ 3,236