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Schedule of Outstanding Debt (Parenthetical) (Detail) | 9 Months Ended
--- | ---
Sep. 30, 2018 USD ($)
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 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 2016 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2016
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 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
Secured Equipment Notes due in 2018 [Member] |
Debt Instrument [Line Items] |
Equipment notes due period | 2018
Payment Frequency | monthly
Secured Equipment Notes due in 2018 [Member] | Commencing on 2013 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2013
Secured Equipment Notes due in 2018 [Member] | Commencing on 2014 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2014
Minimum [Member] | Secured Equipment Notes due in 2024 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 403
Interest rate secured debt | 2.85%
Minimum [Member] | Secured Equipment Notes due in 2023 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 669
Interest rate secured debt | 2.23%
Minimum [Member] | Secured Equipment Notes due in 2022 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 3,030
Interest rate secured debt | 2.16%
Minimum [Member] | Secured Equipment Notes due in 2021 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 1,940
Interest rate secured debt | 2.04%
Minimum [Member] | Secured Equipment Notes due in 2020 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 3,614
Interest rate secured debt | 1.72%
Minimum [Member] | Secured Equipment Notes due in 2019 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 1,594
Interest rate secured debt | 1.87%
Minimum [Member] | Secured Equipment Notes due in 2018 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 6,480
Interest rate secured debt | 2.05%
Maximum [Member] | Secured Equipment Notes due in 2024 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 83,000
Interest rate secured debt | 3.41%
Maximum [Member] | Secured Equipment Notes due in 2023 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 341,341
Interest rate secured debt | 4.06%
Maximum [Member] | Secured Equipment Notes due in 2022 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 254,190
Interest rate secured debt | 2.87%
Maximum [Member] | Secured Equipment Notes due in 2021 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 352,655
Interest rate secured debt | 2.96%
Maximum [Member] | Secured Equipment Notes due in 2020 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 398,496
Interest rate secured debt | 2.78%
Maximum [Member] | Secured Equipment Notes due in 2019 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 325,050
Interest rate secured debt | 2.62%
Maximum [Member] | Secured Equipment Notes due in 2018 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 163,428
Interest rate secured debt | 2.70%

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