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Schedule of Outstanding Debt (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
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	$ 8,902
Secured long-term debt	270,359	$ 281,625
Less current portion	(93,562)	(94,691)
Total long-term debt	176,797	186,934
Secured Equipment Notes due in 2025 [Member]
Debt Instrument [Line Items]
Secured long-term debt	74,494
Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Secured long-term debt	49,920	62,690
Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Secured long-term debt	112,668	153,350
Secured Equipment Notes due in 2022 [Member]
Debt Instrument [Line Items]
Secured long-term debt	8,943	16,892
Secured Equipment Notes due in 2021 [Member]
Debt Instrument [Line Items]
Secured long-term debt	$ 15,432	35,076
Secured Equipment Notes due in 2020 [Member]
Debt Instrument [Line Items]
Secured long-term debt		$ 13,617

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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