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Schedule of Outstanding Debt (Parenthetical) (Detail) | 9 Months Ended
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Sep. 30, 2019
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 2017 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2017
Secured Equipment Notes due in 2024 [Member] | Commencing on 2018 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2018
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 2023 [Member] |
Debt Instrument [Line Items] |
Equipment notes due period | 2023
Payment Frequency | monthly
Secured Equipment Notes due in 2023 [Member] | Commencing on 2017 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2017
Secured Equipment Notes due in 2023 [Member] | Commencing on 2018 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2018
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
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 2020 [Member] |
Debt Instrument [Line Items] |
Equipment notes due period | 2020
Payment Frequency | monthly
Secured Equipment Notes due in 2020 [Member] | Commencing on 2016 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2016
Secured Equipment Notes due in 2020 [Member] | Commencing on 2013 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2013
Secured Equipment Notes due in 2019 [Member] |
Debt Instrument [Line Items] |
Equipment notes due period | 2019
Payment Frequency | monthly
Secured Equipment Notes due in 2019 [Member] | Commencing on 2015 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2015
Secured Equipment Notes due in 2019 [Member] | Commencing on 2013 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2013
Minimum [Member] | Secured Equipment Notes due in 2024 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.75%
Minimum [Member] | Secured Equipment Notes due in 2023 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.23%
Minimum [Member] | Secured Equipment Notes due in 2022 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.16%
Minimum [Member] | Secured Equipment Notes due in 2021 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.04%
Minimum [Member] | Secured Equipment Notes due in 2020 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 1.72%
Minimum [Member] | Secured Equipment Notes due in 2019 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.05%
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 2023 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 4.16%
Maximum [Member] | Secured Equipment Notes due in 2022 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.87%
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 2020 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.78%
Maximum [Member] | Secured Equipment Notes due in 2019 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.62%

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