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Acquisitions - Additional Information (Detail) (USD $)
 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Exel Transportation Services, Inc.
Person
Jun. 30, 2011
Domestic Transport Inc.
Installment
Person
Dec. 31, 2012
Domestic Transport Inc.
Dec. 31, 2011
Domestic Transport Inc.
Oct. 31, 2011
Challenge Transport Inc
Installment
Person
Dec. 31, 2012
Challenge Transport Inc
Business Acquisition [Line Items]            
Number of agents 221          
Number of sales and operating agents 93          
Number of sales agents 128          
Purchase price   $ 700,000     $ 2,500,000  
Number of installment payments   4     4  
Number of drivers   22     41  
Initial installment payment   600,000     2,000,000  
Subsequent quarterly installment payments   25,000 50,000 50,000 125,000 500,000
Purchase price allocation, driver and customer relationships   100,000     300,000  
Purchase price allocation, tractors   200,000        
Purchase price allocation, goodwill   400,000     900,000  
Purchase price allocation, customer relationships         $ 1,300,000