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Components of Other Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011
Other Intangible Assets [Line Items] |  |
Intangible Assets, Gross Amount | 25,146 | 25,146
Finite-lived intangible assets, accumulated amortization | (5,078) | (3,479)
Intangible Assets, Net Carrying Value | 20,068 | 21,667
Hub |  |
Other Intangible Assets [Line Items] |  |
Intangible Assets, Gross Amount | 9,784 | 9,784
Finite-lived intangible assets, accumulated amortization | (3,585) | (2,839)
Intangible Assets, Net Carrying Value | 6,199 | 6,945
Hub | Trade Names |  |
Other Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets, gross amount | 2,904 | 2,904
Indefinite-lived intangible assets, net carrying value | 2,904 | 2,904
Hub | Customer Relationships |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | 5,181 | 5,181
Finite-lived intangible assets, accumulated amortization | (2,015) | (1,547)
Finite-lived intangible assets, net carrying value | 3,166 | 3,634
Hub | Customer Relationships | Minimum |  |
Other Intangible Assets [Line Items] |  |
Intangible assets estimated useful life | 7 years | 7 years
Hub | Customer Relationships | Maximum |  |
Other Intangible Assets [Line Items] |  |
Intangible assets estimated useful life | 15 years | 15 years
Hub | Relationships With Owner Operators |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | 1,179 | 1,179
Finite-lived intangible assets, accumulated amortization | (1,050) | (786)
Finite-lived intangible assets, net carrying value | 129 | 393
Hub | Relationships With Owner Operators | Minimum |  |
Other Intangible Assets [Line Items] |  |
Intangible assets estimated useful life | 2 years | 2 years
Hub | Relationships With Owner Operators | Maximum |  |
Other Intangible Assets [Line Items] |  |
Intangible assets estimated useful life | 6 years | 6 years
Hub | Information Technology |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | 500 | 500
Finite-lived intangible assets, accumulated amortization | (500) | (486)
Finite-lived intangible assets, net carrying value |  | 14
Intangible assets estimated useful life | 6 years | 6 years
Hub | Backlog/open orders |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | 20 | 20
Finite-lived intangible assets, accumulated amortization | (20) | (20)
Intangible assets estimated useful life | 1 month | 1 month
Mode | Agency/Customer Relationships |  |
Other Intangible Assets [Line Items] |  |
Finite-lived intangible assets, gross amount | 15,362 | 15,362
Finite-lived intangible assets, accumulated amortization | (1,493) | (640)
Finite-lived intangible assets, net carrying value | 13,869 | 14,722
Intangible assets estimated useful life | 18 years | 18 years

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- Definition 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) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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