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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 |

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- Definition The total cost of the acquired entity including the cash paid to shareholders of acquired entities, fair value of debt and equity securities issued to shareholders of acquired entities, the fair value of the liabilities assumed, and direct costs of the acquisition. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of acquisition cost of a business combination allocated to equipment used in the normal course of business, not including equipment that is held-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 51 -Subparagraph e -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 141 -Paragraph 37 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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