Schedule of Outstanding Debt (Parenthetical) (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Secured Equipment Notes due in December 2020 [Member]
Debt Instrument [Line Items]
Equipment notes due	Dec. 31, 2020
Monthly payments	$ 600
Equipment notes, date of first required payment	Jan. 31, 2016
Fixed rate, minimum	2.02%
Fixed rate, maximum	2.03%
Secured Equipment Notes due in September 2020 [Member]
Debt Instrument [Line Items]
Equipment notes due	Sep. 30, 2020
Monthly payments	$ 200
Equipment notes, date of first required payment	Oct. 31, 2015
Payment Frequency	Monthly
Interest rate secured debt	1.84%
Secured Equipment Notes due in July 2020 [Member]
Debt Instrument [Line Items]
Equipment notes due	Jul. 31, 2020
Monthly payments	$ 100
Equipment notes, date of first required payment	Jul. 31, 2015
Payment Frequency	Monthly
Interest rate secured debt	2.14%
Secured Equipment Notes due in March 2020 [Member]
Debt Instrument [Line Items]
Equipment notes due	Mar. 31, 2020
Monthly payments	$ 40
Equipment notes, date of first required payment	Apr. 30, 2015
Payment Frequency	Monthly
Interest rate secured debt	2.14%
Secured Equipment Notes due in January 2020 [Member]
Debt Instrument [Line Items]
Equipment notes due	Jan. 31, 2020
Monthly payments	$ 200
Equipment notes, date of first required payment	Feb. 28, 2015
Fixed rate, minimum	1.72%
Fixed rate, maximum	2.26%
Payment Frequency	Monthly
Secured Equipment Notes due in December 2019 [Member]
Debt Instrument [Line Items]
Equipment notes due	Dec. 31, 2019	Dec. 31, 2019
Monthly payments	$ 200	$ 200
Equipment notes, date of first required payment	Jan. 31, 2015	Jan. 31, 2015
Payment Frequency	Monthly
Interest rate secured debt	2.24%	2.24%
Secured Equipment Notes due in November 2019 [Member]
Debt Instrument [Line Items]
Equipment notes due	Nov. 30, 2019	Nov. 30, 2019
Monthly payments	$ 500	$ 500
Equipment notes, date of first required payment	Dec. 31, 2014	Dec. 31, 2014
Payment Frequency	Monthly
Interest rate secured debt	2.05%	2.05%
Secured Equipment Notes due in September 2019 [Member]
Debt Instrument [Line Items]
Equipment notes due	Sep. 30, 2019	Sep. 30, 2019
Monthly payments	$ 400	$ 400
Equipment notes, date of first required payment	Sep. 30, 2014	Sep. 30, 2014
Payment Frequency	Monthly
Interest rate secured debt	2.15%	2.15%
Secured Equipment Notes due in February 2019 [Member]
Debt Instrument [Line Items]
Equipment notes due	Feb. 28, 2019	Feb. 28, 2019
Monthly payments	$ 400	$ 400
Equipment notes, date of first required payment	Jan. 31, 2014	Jan. 31, 2014
Fixed rate, minimum	1.87%	1.87%
Fixed rate, maximum	1.93%	1.93%
Payment Frequency	Monthly
Secured Equipment Notes due in June 2018 [Member]
Debt Instrument [Line Items]
Equipment notes due	Jun. 30, 2018	Jun. 30, 2018
Monthly payments	$ 500	$ 500
Equipment notes, date of first required payment	Aug. 31, 2013	Aug. 31, 2013
Fixed rate, minimum	1.90%	1.90%
Fixed rate, maximum	2.00%	2.00%
Payment Frequency	Quarterly

Date the debt agreement requires the first payment to be made, in CCYY-MM-DD format.

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

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+ References

Reference 1: 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

Reference 2: 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

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