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v3.21.2

Schedule of Outstanding Debt (Parenthetical) (Detail) | 9 Months Ended
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Sep. 30, 2021
Secured Equipment Notes due in 2026 [Member] |
Debt Instrument [Line Items] |
Equipment notes due period | 2026
Payment Frequency | monthly
Secured Equipment Notes due in 2026 [Member] | Commencing on 2021 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2021
Secured Equipment Notes due in 2025 [Member] |
Debt Instrument [Line Items] |
Equipment notes due period | 2025
Payment Frequency | monthly
Secured Equipment Notes due in 2025 [Member] | Commencing on 2020 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2020
Secured Equipment Notes due in 2024 [Member] |
Debt Instrument [Line Items] |
Equipment notes due period | 2024
Payment Frequency | monthly
Secured Equipment Notes due in 2024 [Member] | Commencing on 2020 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2020
Secured Equipment Notes due in 2024 [Member] | Commencing on 2019 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2019
Secured Equipment Notes due in 2024 [Member] | Commencing on 2017 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2017
Secured Equipment Notes due in 2021 [Member] |
Debt Instrument [Line Items] |
Equipment notes due period | 2021
Payment Frequency | monthly
Secured Equipment Notes due in 2021 [Member] | Commencing on 2017 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2017
Secured Equipment Notes due in 2021 [Member] | Commencing on 2014 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2014
Secured Equipment Notes due in 2023 [Member] |
Debt Instrument [Line Items] |
Equipment notes due period | 2023
Payment Frequency | monthly
Secured Equipment Notes due in 2023 [Member] | Commencing on 2019 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2019
Secured Equipment Notes due in 2023 [Member] | Commencing on 2016 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2016
Secured Equipment Notes due in 2022 [Member] |
Debt Instrument [Line Items] |
Equipment notes due period | 2022
Payment Frequency | monthly
Secured Equipment Notes due in 2022 [Member] | Commencing on 2017 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2017
Secured Equipment Notes due in 2022 [Member] | Commencing on 2015 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2015
Minimum [Member] | Secured Equipment Notes due in 2026 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 1.48%
Minimum [Member] | Secured Equipment Notes due in 2025 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 1.51%
Minimum [Member] | Secured Equipment Notes due in 2024 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.50%
Minimum [Member] | Secured Equipment Notes due in 2021 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.02%
Minimum [Member] | Secured Equipment Notes due in 2023 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.20%
Minimum [Member] | Secured Equipment Notes due in 2022 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.20%
Maximum [Member] | Secured Equipment Notes due in 2026 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 1.83%
Maximum [Member] | Secured Equipment Notes due in 2025 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 1.80%
Maximum [Member] | Secured Equipment Notes due in 2024 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 3.59%
Maximum [Member] | Secured Equipment Notes due in 2021 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.96%
Maximum [Member] | Secured Equipment Notes due in 2023 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 4.20%
Maximum [Member] | Secured Equipment Notes due in 2022 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.90%

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