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Acquisitions - Additional Information (Detail) (USD $) | 12 Months Ended | 1 Months Ended | 12 Months Ended |  | 1 Months Ended | 12 Months Ended |
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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 |  |  |

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