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Schedule of Outstanding Debt (Parenthetical) (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($)
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 2016 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2016
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 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 2015 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2015
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 2014 [Member] |
Debt Instrument [Line Items] |
Equipment notes, date of first required payment | 2014
Secured Equipment Notes due in June 2018 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 500
Payment Frequency | quarterly
Equipment notes due | Jun. 30, 2018
Equipment notes, date of first required payment | Aug. 31, 2013
Minimum [Member] | Secured Equipment Notes due in 2021 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 10
Interest rate secured debt | 2.04%
Minimum [Member] | Secured Equipment Notes due in 2020 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 40
Interest rate secured debt | 1.72%
Minimum [Member] | Secured Equipment Notes due in 2019 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 80
Interest rate secured debt | 1.87%
Minimum [Member] | Secured Equipment Notes due in June 2018 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 1.90%
Maximum [Member] | Secured Equipment Notes due in 2021 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 300
Interest rate secured debt | 2.96%
Maximum [Member] | Secured Equipment Notes due in 2020 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 400
Interest rate secured debt | 2.26%
Maximum [Member] | Secured Equipment Notes due in 2019 [Member] |
Debt Instrument [Line Items] |
Monthly payments | $ 400
Interest rate secured debt | 2.24%
Maximum [Member] | Secured Equipment Notes due in June 2018 [Member] |
Debt Instrument [Line Items] |
Interest rate secured debt | 2.00%

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- Definition Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format. + 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=6479336&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 + Details
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