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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, 2013
Exel Transportation Services, Inc. [Member]
Person
Jun. 30, 2011
Domestic Transport Inc. [Member]
Installment
Person
Dec. 31, 2012
Domestic Transport Inc. [Member]
Dec. 31, 2011
Domestic Transport Inc. [Member]
Jun. 30, 2011
Domestic Transport Inc. [Member]
Driver and Customer Relationships [Member]
Oct. 31, 2011
Challenge Transport Inc [Member]
Installment
Person
Dec. 31, 2012
Challenge Transport Inc [Member]
Oct. 31, 2011
Challenge Transport Inc [Member]
Customer Relationships [Member]
Oct. 31, 2011
Challenge Transport Inc [Member]
Driver Relationship [Member]
Business Acquisition [Line Items]                  
Number of agents 230                
Number of sales and operating agents 90                
Number of sales agents 140                
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         100,000     1,300,000 300,000
Purchase price allocation, tractors   200,000              
Purchase price allocation, goodwill   $ 400,000       $ 900,000