Schedule of Outstanding Debt (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Secured Equipment Notes due in March 2020 [Member]
Debt Instrument [Line Items]
Equipment notes due	Mar. 31, 2020
Monthly payments	$ 0.04
Equipment notes, date of first required payment	Apr. 30, 2015
Interest rate secured debt	2.14%
Payment Frequency	Monthly
Secured Equipment Notes due in January 2020 [Member]
Debt Instrument [Line Items]
Equipment notes due	Jan. 31, 2020
Monthly payments	0.20
Equipment notes, date of first required payment	Feb. 28, 2015
Payment Frequency	Monthly
Lower interest rate paid at a fixed rate	1.72%
Upper interest rate paid at a fixed rate	2.26%
Secured Equipment Notes due in December 2019 [Member]
Debt Instrument [Line Items]
Equipment notes due	Dec. 31, 2019	Dec. 31, 2019
Monthly payments	0.20	0.20
Equipment notes, date of first required payment	Jan. 31, 2015	Jan. 31, 2015
Interest rate secured debt	2.24%	2.24%
Payment Frequency	Monthly	Monthly
Secured Equipment Notes due in November 2019 [Member]
Debt Instrument [Line Items]
Equipment notes due	Nov. 30, 2019	Nov. 30, 2019
Monthly payments	0.50	0.50
Equipment notes, date of first required payment	Dec. 31, 2014	Dec. 31, 2014
Interest rate secured debt	2.05%	2.05%
Payment Frequency	Monthly	Monthly
Secured Equipment Notes due in September 2019 [Member]
Debt Instrument [Line Items]
Equipment notes due	Sep. 30, 2019	Sep. 30, 2019
Monthly payments	0.40	0.40
Equipment notes, date of first required payment	Sep. 30, 2014	Sep. 30, 2014
Interest rate secured debt	2.15%	2.15%
Payment Frequency	Monthly	Monthly
Secured Equipment Notes due in February 2019 [Member]
Debt Instrument [Line Items]
Equipment notes due	Feb. 28, 2019	Feb. 28, 2019
Monthly payments	0.40	0.40
Equipment notes, date of first required payment	Jan. 31, 2014	Jan. 31, 2014
Payment Frequency	Monthly	Monthly
Lower interest rate paid at a fixed rate	1.87%	1.87%
Upper interest rate paid at a fixed rate	1.93%	1.93%
Secured Equipment Notes due in June 2018 [Member]
Debt Instrument [Line Items]
Equipment notes due	Jun. 30, 2018	Jun. 30, 2018
Monthly payments	$ 0.50	$ 0.50
Equipment notes, date of first required payment	Aug. 31, 2013	Aug. 31, 2013
Payment Frequency	Quarterly	Quarterly
Lower interest rate paid at a fixed rate	1.90%	1.90%
Upper interest rate paid at a fixed rate	2.00%	2.00%

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 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 SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Section 02

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Name Regulation S-X (SX)

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Amount of the required periodic payments including both interest and principal payments.

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