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Schedule of Outstanding Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
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 $ 34,322 $ 6,137
Secured long-term debt 346,607 342,465
Less current portion (102,773) (101,741)
Total long-term debt 243,834 240,724
Secured Equipment Notes due in 2028 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 48,836 0
Secured Equipment Notes due in 2027 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 155,746 177,295
Secured Equipment Notes due in 2026 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 63,109 78,359
Secured Equipment Notes due in 2025 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 32,675 43,955
Secured Equipment Notes due in 2024 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt 10,729 20,751
Secured Equipment Notes due in 2023 [Member]    
Debt Instrument [Line Items]    
Secured long-term debt $ 1,190 $ 15,968