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Schedule of Outstanding Debt (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2017 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 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 June 2018 [Member]
Debt Instrument [Line Items]
Payment Frequency	quarterly
Equipment notes due	Jun. 30, 2018
Secured Equipment Notes due in June 2018 [Member] | Commencing on 2012 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2012
Secured Equipment Notes due in June 2018 [Member] | Commencing on 2014 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2014
Secured Equipment Notes due in 2017 [Member]
Debt Instrument [Line Items]
Equipment notes due period	2017
Payment Frequency	monthly
Secured Equipment Notes due in 2017 [Member] | Commencing on 2012 [Member]
Debt Instrument [Line Items]
Equipment notes, date of first required payment	2012
Secured Equipment Notes due in 2017 [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]
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	$ 6,175
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 June 2018 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 542
Interest rate secured debt	1.89%
Minimum [Member] | Secured Equipment Notes due in 2017 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 12,964
Interest rate secured debt	2.06%
Maximum [Member] | Secured Equipment Notes due in 2024 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 83,000
Interest rate secured debt	3.28%
Maximum [Member] | Secured Equipment Notes due in 2023 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 41,238
Interest rate secured debt	3.12%
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	$ 326,333
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	$ 444,000
Interest rate secured debt	2.62%
Maximum [Member] | Secured Equipment Notes due in June 2018 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 480,000
Interest rate secured debt	4.45%
Maximum [Member] | Secured Equipment Notes due in 2017 [Member]
Debt Instrument [Line Items]
Monthly payments	$ 19,792
Interest rate secured debt	2.11%

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
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-Section S99
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(2))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

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