Components of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Other Intangible Assets [Line Items]
Intangible Assets, Gross Amount	25,146	25,146
Finite-lived intangible assets, Accumulated Amortization	(7,808)	(6,513)
Indefinite-lived intangible assets, Accumulated Impairment Loss	(2,904)	(2,904)
Intangible Assets, Net Carrying Value	14,434	15,729
Hub [Member]
Other Intangible Assets [Line Items]
Intangible Assets, Gross Amount	9,784	9,784
Finite-lived intangible assets, Accumulated Amortization	(4,608)	(4,166)
Indefinite-lived intangible assets, Accumulated Impairment Loss	(2,904)	(2,904)
Intangible Assets, Net Carrying Value	2,272	2,714
Hub [Member] \| Trade Names [Member]
Other Intangible Assets [Line Items]
Indefinite-lived intangible assets, Gross Amount	2,904	2,904
Indefinite-lived intangible assets, Accumulated Impairment Loss	(2,904)	(2,904)
Indefinite-lived intangible assets, Net Carrying Value	0	0
Hub [Member] \| Customer Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	5,181	5,181
Finite-lived intangible assets, Accumulated Amortization	(2,909)	(2,467)
Finite-lived intangible assets, Net Carrying Value	2,272	2,714
Hub [Member] \| Customer Relationships [Member] \| Minimum [Member]
Other Intangible Assets [Line Items]
Intangible assets estimated useful life	7 years	7 years
Hub [Member] \| Customer Relationships [Member] \| Maximum [Member]
Other Intangible Assets [Line Items]
Intangible assets estimated useful life	15 years	15 years
Hub [Member] \| Relationships With Owner Operators [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	1,179	1,179
Finite-lived intangible assets, Accumulated Amortization	(1,179)	(1,179)
Finite-lived intangible assets, Net Carrying Value	0	0
Hub [Member] \| Relationships With Owner Operators [Member] \| Minimum [Member]
Other Intangible Assets [Line Items]
Intangible assets estimated useful life	2 years	2 years
Hub [Member] \| Relationships With Owner Operators [Member] \| Maximum [Member]
Other Intangible Assets [Line Items]
Intangible assets estimated useful life	6 years	6 years
Hub [Member] \| Information Technology [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	500	500
Finite-lived intangible assets, Accumulated Amortization	(500)	(500)
Finite-lived intangible assets, Net Carrying Value	0	0
Intangible assets estimated useful life	6 years	6 years
Hub [Member] \| Backlog/open orders [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	20	20
Finite-lived intangible assets, Accumulated Amortization	(20)	(20)
Finite-lived intangible assets, Net Carrying Value	0	0
Intangible assets estimated useful life	1 month	1 month
Mode [Member] \| Agency/Customer Relationships [Member]
Other Intangible Assets [Line Items]
Finite-lived intangible assets, Gross Amount	15,362	15,362
Finite-lived intangible assets, Accumulated Amortization	(3,200)	(2,347)
Finite-lived intangible assets, Net Carrying Value	12,162	13,015
Intangible assets estimated useful life	18 years	18 years

Indefinite lived intangible assets accumulated impairment loss.

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Indefinite lived intangible assets excluding goodwill gross.

+ References

No definition available.

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Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (b)

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- Definition

Amount before accumulated amortization of intangible assets, excluding goodwill.

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- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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-Publisher FASB

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-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

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