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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