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Components of Other Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Other Intangible Assets [Line Items]    
Intangible Assets, Gross Amount $ 25,146 $ 25,146
Finite-lived intangible assets, Accumulated Amortization (6,513) (5,078)
Finite-lived intangible assets, Accumulated Impairment Loss (2,904)   
Intangible Assets, Net Carrying Value 15,729 20,068
Hub [Member]
    
Other Intangible Assets [Line Items]    
Intangible Assets, Gross Amount 9,784 9,784
Finite-lived intangible assets, Accumulated Amortization (4,166) (3,585)
Finite-lived intangible assets, Accumulated Impairment Loss (2,904)   
Intangible Assets, Net Carrying Value 2,714 6,199
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 (2,467) (2,015)
Finite-lived intangible assets, Accumulated Impairment Loss     
Finite-lived intangible assets, Net Carrying Value 2,714 3,166
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) (1,050)
Finite-lived intangible assets, Accumulated Impairment Loss     
Finite-lived intangible assets, Net Carrying Value    129
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, Accumulated Impairment Loss     
Finite-lived intangible assets, Net Carrying Value     
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, Accumulated Impairment Loss     
Finite-lived intangible assets, Net Carrying Value     
Intangible assets estimated useful life 1 month 1 month
Hub [Member] | Trade Names [Member]
    
Other Intangible Assets [Line Items]    
Indefinite-lived intangible assets, Gross Amount 2,904 2,904
Indefinite-lived intangible assets, Net Carrying Value   2,904
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 (2,347) (1,493)
Finite-lived intangible assets, Accumulated Impairment Loss     
Finite-lived intangible assets, Net Carrying Value $ 13,015 $ 13,869
Intangible assets estimated useful life 18 years 18 years